AVENGER EFI
4 BBL MPFI SYSTEMS
SINGLE PLANE 4BBL SMALL BLOCK CHEVY MULTI-PORT EFI SYSTEMS
550-811 (Early/Late Models)
550-816 (Vortec Heads)
SINGLE PLANE 4BBL BIG BLOCK CHEVY MULTI-PORT EFI SYSTEMS
550-831 (Std Deck, 1000 CFM Rect. Port)
550-836 (Std Deck, 1000 CFM Oval Port)
HARDWARE AND FUEL SYSTEM
INSTALLATION MANUAL – 199R10553
NOTE:
These instructions must be read and fully understood before beginning installation. If this manual is not fully understood,
installation should not be attempted. Failure to follow these instructions, including the pictures may result in subsequent
system failure.
TABLE OF CONTENTS
1.0 INTRODUCTION ..................................................................................................................................................................... 3
2.0 BEFORE YOU BEGIN ............................................................................................................................................................. 3
3.0 WARNINGS, NOTES, AND NOTICES .................................................................................................................................... 3
4.0 SKILL LEVEL REQUIRED ....................................................................................................................................................... 4
5.0 ADDITIONAL ITEMS REQUIRED FOR INSTALLATION ........................................................................................................ 4
6.0 TOOLS REQUIRED FOR INSTALLATION .............................................................................................................................. 4
7.0 AVENGER EFI SYSTEM OPTIONS ........................................................................................................................................ 4
8.0 PLANNING THE INSTALLATION ............................................................................................................................................ 4
9.0 REMOVAL OF EXISTING FUEL SYSTEM .............................................................................................................................. 5
9.1 Preparing the Manifold for Installation .................................................................................................................................. 5
9.2 Installation of AVENGER EFI Manifold ................................................................................................................................ 5
9.3 Installing the distributor ........................................................................................................................................................ 7
9.4 Vacuum Line Connections ................................................................................................................................................... 7
10.0 SUPPLY AND RETURN FUEL SYSTEM INSTALLATION .................................................................................................... 7
10.1 Fuel Supply/Return System Description ............................................................................................................................. 7
10.2 Fuel Pressure Regulator .................................................................................................................................................... 8
10.3 Fuel Pump Installation ........................................................................................................................................................ 9
10.4 Fuel Line Mounting ............................................................................................................................................................. 9
10.5 Fuel Filters ......................................................................................................................................................................... 9
10.6 Return Line Installation .................................................................................................................................................... 10
10.7 Oxygen Sensor Installation .............................................................................................................................................. 11
10.7.1 Oxygen Sensor Mounting Procedure .......................................................................................................................... 11
10.7.2 ECU Mounting ........................................................................................................................................................... 12
11.0 WIRING ............................................................................................................................................................................... 12
11.1 Important Wiring “Do’s and Don’ts” .................................................................................................................................. 12
12.0 WIRING HARNESS INSTALLATION ................................................................................................................................... 12
12.1 Main Power/Battery Connection ....................................................................................................................................... 12
13.0 PRIMARY HARNESS INSTALLATION AND SENSORS CONNECTION ............................................................................ 13
13.1 ECU Connectors .............................................................................................................................................................. 13
13.2 Harness Routing .............................................................................................................................................................. 13
13.3 Sensor Connections & Outputs ........................................................................................................................................ 14
13.3.1 Throttle Position Sensor (TPS) .................................................................................................................................. 14
13.3.2 Manifold Air Pressure Sensor (MAP) ......................................................................................................................... 14
13.3.3 Coolant Temperature Sensor (CTS) .......................................................................................................................... 14
13.3.4 Manifold Air Temperature Sensor (MAT) ................................................................................................................... 14
13.3.6 Wide Band Oxygen Sensor (WB02) .......................................................................................................................... 14
13.3.7 Fuel Pressure (Fuel) .................................................................................................................................................. 15
13.3.8 Oil Pressure (Oil) ....................................................................................................................................................... 15
13.3.9 CANbus – Handheld (CAN) ....................................................................................................................................... 15
13.3.10 Knock Sensor (Knock) ............................................................................................................................................. 15
13.3.11 Ignition (IGN) – ........................................................................................................................................................ 16
14.0 PRIMARY OUTPUTS .......................................................................................................................................................... 16
14.1 Idle Air Control (IAC) ........................................................................................................................................................ 16
14.2 Fuel Injector Outputs (INJ) and Fuel Injector Harness ..................................................................................................... 16
15.0 LOOSE WIRES.................................................................................................................................................................... 16
16.0 IGNITION/ENGINE SPEED INPUT ..................................................................................................................................... 17
17.0 WIRING ............................................................................................................................................................................... 18
18.0 ADDITIONAL OUTPUTS ..................................................................................................................................................... 21
APPENDIX 1.0.............................................................................................................................................................................. 22
Pinout ........................................................................................................................................................................................ 22
2
1.0 INTRODUCTION
Holley has written this manual for the installation of the AVENGER EFI manifold and fuel system. Wiring harness and ECU
installation, sensor connections, startup, and tuning are contained on the disc supplied with AVENGER systems. Please read
all the WARNINGS, NOTES, and TIPS, as they contain valuable information that can save you time and money. Should you
need information or parts assistance, please contact our technical service department at 1-270-781-9741, Monday through
Friday, 8 a.m. to 5 p.m. CST. Please have the part number of the product you purchased when you call.
WARNING!
The AVENGER EFI systems consist of a number of sophisticated components. Failure of any one
component does not constitute, nor does it justify, warranty of the complete system. Individual service
items are available for replacement of components. If assistance is required or if you need further
warranty clarification, you can call Holley Technical Service at the number shown above.
WARNING!
To preserve warranty, these instructions must be read and followed thoroughly and completely before
and during installation. It is important that you become familiar with the parts and the installation of the
AVENGER EFI system before you begin. Failure to read and understand these instructions could result
in damage to AVENGER EFI components that are not covered by the warranty and could result in serious
personal injury and property damage.
WARNING!
Use of leaded fuels will degrade the oxygen sensor and will result in incorrect exhaust gas oxygen
readings and improper fuel delivery. Failure to follow these directions does not constitute the right to a
warranty claim.
WARNING!
Failure to follow all of the above will result in an improper installation, which may lead to personal injury,
including death, and/or property damage. Improper installation and/or misuse of this or any Holley
product will void all warrantees.
WARNING!
Use of some RTV silicone sealers will destroy the oxygen sensor used with this product. Ensure the RTV
silicone sealant you use is compatible with oxygen sensor vehicles. This information should be found on
the RTV package.
2.0 BEFORE YOU BEGIN
Fuel injection systems have proven to increase engine performance by allowing the engine to operate to the best output it is
capable of producing. Make sure your engine is in good basic running order before installing the AVENGER EFI fuel injection
system. Anything that increases the power of your engine demands more from all the components and systems. If your engine
is in poor condition before you begin this installation, you won't get the results you want.
Fuel injection is more efficient, but also less forgiving than a carburetor. A properly tuned EFI system can disclose hidden
problems your carburetor may have concealed. Corroded terminals or a weak battery, alternator or ignition system will not
adversely affect your carburetor, but they will interfere with the precision functions of an EFI system.
The engine cooling system must have a working 160F to 210F thermostat. The intake manifold needs to be hot enough to
completely vaporize the injected fuel.
3.0 WARNINGS, NOTES, AND NOTICES
WARNING! For the safety and protection of you and others, the installation, adjustment, and repair must be performed
only by a trained mechanic having adequate fuel system experience. It is particularly important to
remember one of the very basic principles of safety: fuel vapors are heavier than air and tend to collect in
low places where an explosive fuel/air mixture may be ignited by any spark or flame resulting in property
damage, personal injury and/or death. Extreme caution must be exercised to prevent spillage and thus
eliminate the formation of such fuel vapors.
WARNING! These instructions are provided as a general guideline for installation. Each user must use his own
judgment to determine whether his own, or the engine's safety will be endangered by any procedure
selected. The user should consult factory engine manuals to ensure compliance with fastener torque and
other important specifications unique to each engine.
WARNING! This type of work MUST be performed in a well-ventilated area. Do not smoke or have an open flame
present near gasoline vapors or an explosion may result.
3
4.0 SKILL LEVEL REQUIRED
Installation of the AVENGER EFI intake system and the ECU requires approximately the same level of skill and experience to
replace or service an induction system consisting of a carburetor and conventional intake manifold (as well as basic wiring skills
for the installations of the ECU).
Adequate skills for modifying the vehicle fuel supply are critical, and will vary widely, depending upon the selected components
and methods of fuel line plumbing. The most basic level will require the user to plumb a high-pressure supply fuel line and a
tank return fuel line to the fuel rails. The most complex level may require the user to modify the fuel tank, re-route or add fuel
lines, or mount various combinations of electrical and/or mechanical fuel pumps. Some fabrications may be required, depending
on applications, for throttle cable assemblies, throttle cable bracket and thermostat housings.
NOTICE: If you are not absolutely certain that you have the skills and experience required to perform these
procedures, we strongly recommend you have this system installed and tested by a technician with
specialized training in EFI and fuel systems service.
5.0 ADDITIONAL ITEMS REQUIRED FOR INSTALLATION
The following is a list of materials that are needed, depending on the application.
 3/8" fuel hose (must meet SAE J30)





 Parts to mount the throttle cable
3/8” steel fuel line (must meet SAE J526)
 RTV sealant (O2 sensor compatible)
Various Electrical Connectors
 Selection of 1/2" and 3/8" pipe plugs
Teflon pipe sealing compound
 Heat Shrink
Mechanical fuel pump block off plate
0-50 psi fuel gauge or Holley 0-100 PSI pressure transducer (recommended)
6.0 TOOLS REQUIRED FOR INSTALLATION
The following is a list of materials that are needed, depending on the application.




Standard wrench set
#2 Phillips screwdriver
Hole saw (2”)
Gasket Scraper
 Small & Medium blade screwdriver
 Digital Volt meter
 Allen Wrench Set




Timing/Advance Light
Drill and assorted bit sizes
10” adjustable wrench
Factory service manual
7.0 AVENGER EFI SYSTEM OPTIONS
AVENGER EFI systems offer several optional brackets and spacers designed to simplify installation in certain applications.
These parts can be ordered separately by contacting our technical service department at 1-270-781-9741.
8.0 PLANNING THE INSTALLATION
Before starting the installation of the AVENGER EFI system several things must be decided:








4
Mounting location of the fuel pump
Mounting location of the fuel filters
Routing of the fuel supply line from the tank, to the filter, to the pump
Routing of the high pressure fuel supply line from the pump to 10micron fuel filter to the fuel rails on top of the manifold
Routing of the fuel return line from the pressure regulator to the fuel tank
Mounting locations of the ECU
Proper throttle cable installation
Proper thermostat housing clearance
9.0 REMOVAL OF EXISTING FUEL SYSTEM
1.
Disconnect the ground side of the battery.
2.
Drain the cooling system. Remove the cooling system hoses and thermostat housing.
3.
Drain the fuel tank, then disconnect the fuel supply line or disconnect the fuel supply line and plug the hose.
4.
Disconnect all throttle linkages.
5.
Identify or number the ignition wires. Numbering the ignition wires will help in reconnecting them during MPI system
assembly. Remove the ignition wires from the coil and spark plugs.
6.
Remove the ignition cables and distributor cap as one unit.
7.
Note the position of the rotor and the distributor housing. Mark rotor position on the distributor and mark distributor housing
position on the engine block to ensure accurate re-assembly. After marking the position of the rotor and the distributor
remove the distributor. It is easiest if the rotor points directly towards the firewall.
8.
Loosen all manifold bolts before removal. Remove the manifold bolts.
DANGER! FROM THIS POINT FORWARD, USE EXTRA CAUTION TO ENSURE NO GASKET MATERIAL OR OTHER
FOREIGN MATTER ENTERS OIL PASSAGES, HEAD PORTS, OR ANY OTHER LOCATION WHERE AN
OBSTRUCTION MIGHT CAUSE DAMAGE.
9.
Remove the existing manifold. If required, remove valve covers.
10. Remove the mechanical fuel pump and push rod and install a mechanical fuel pump block-off plate.
9.1 Preparing the Manifold for Installation
1.
Protect the lifter galley with clean shop rags. Close off the ports by stuffing them with clean shop rags.
WARNING! Failure to cover the intake opening with a clean towel could result in dirt or debris entering the engine.
Dirt or debris in the induction system can cause engine damage, which may require a complete engine
overhaul.
2.
Using a gasket scraper, remove gasket material from heads and block. When all loose material is removed, carefully
remove the shop rags from the ports, ensuring that no material falls into passages. Using a shop vac, remove all debris
from the lifter gallery.
3.
Inspect carefully. Use a flashlight to inspect the interior of all air, oil, and water passages.
4.
Soak a clean shop rag with solvent, and clean all sealing surfaces. Surfaces must be completely clean to ensure a reliable
seal between the components and gaskets.
9.2 Installation of AVENGER EFI Manifold
WARNING! Use new gaskets. Be sure you are using the proper gasket for your engine, for aluminum manifolds, as
recommended by the manufacturer.
1.
The manifold comes with the rails, fittings, and crossovers loosely installed in the proper locations. The crossover lines will
have to be removed in order to install the intake manifold bolts. The injectors, fittings, rails, and crossovers should be
assembled and tightened after the manifold is installed on the engine.
2.
Install the manifold gaskets, carefully following the instructions provided by the gasket manufacturer.
3.
Use O2 sensor compatible RTV (again following manufacturer's instructions) around all water passages and for end seals
if end seal gaskets are not used.
4.
Carefully position the manifold on the heads, so the bolt holes in the manifold are centered over bolt hoses in the heads.
5.
Hand start all the bolts.
5
6.
Tighten down the manifold bolts in the proper sequence and torque as recommended in the engine manual.
NOTE: Consult your engine manual for proper fastener torque, bolt tightening pattern and other manifold installation
specifications.
7.
Remove the fuel rails. Install the fuel injectors. Lubricate the fuel injector top and bottom O-rings. Do not use synthetic,
animal or vegetable oils. Use of an O-ring specific lubricant is recommended. Use motor oil if you do not have a good
O-ring lubricant. Be careful not to damage the O-rings.
WARNING! Damage of the O-ring can cause fuel leakage. A fuel leak may result in a fire or an explosion hazard, which
could cause serious injury or death.
8.
Carefully install the injectors into the rails and then install the injectors and both rails into the manifold. Reinstall the four
1/4-20 x 1” Allen head screws that held the rails in place and tighten securely.
9.
Make sure that the four end fittings in the fuel rails (they should already be installed but not tightened) are threaded in to an
adequate depth.
10. Reattach the front and rear crossover tubes. Tighten completely hand tight.
11. After the crossover tubes are installed, tighten the nut on the four fittings that go into the fuel rails. Tighten securely.
12. Securely tighten the front and rear crossover tubes with a wrench.
13. Install the schrader valve to the front of the fuel rail if not already installed. Use Teflon tape or liquid Teflon sealer. See
Figure 1. If you are going to use a fuel pressure gauge or transducer, you may wish to install it in this port.
14. The regulator should already be installed. Make sure that the two Allen head screws securing it to the fuel rail are tight.
Also check that the regulator fitting it tight and is pointed in the desired direction. Do not overtighten the fitting in the
regulator or it will leak.
Figure 1
15. Next install the throttle body. The throttle body is in a separate box in the kit, which contains the gaskets needed. First
install the gasket that matches the manifold base. Next install the steel plate included with the throttle body. Next install the
gasket that matches the plate. Install the throttle body with the 4 5/16-18 bolts and washers included. The MAP sensor
bracket is attached by the rear, passenger side bolt. Install the MAP sensor first with the two 10-32 x 1” screws and #10
washers. See Figure 1. The throttle cable bracket is attached with the rear driver’s side bolt. The bracket in the kit works
with most throttle cables and transmission cables.
16. Tighten throttle body bolts securely.
6
17. Check the front fuel rail cross over tubing. This line may shift during the foregoing operations, so ensure that the line
cannot interfere against the manifold runner or the water cross-over. Adjust if necessary.
18. Install new thermostat housing gasket, replace thermostat housing, replace the coolant hoses and refill the cooling system.
19. Attach the throttle cable.
9.3 Installing the distributor
Follow the manufacturer’s recommended procedures for the following steps:
1.
Drop in the distributor making sure that the rotor aligns with marks made during disassembly. If you are installing a new
distributor, you will have to make sure it is properly timed.
2.
Align distributor housing with marks made on block during disassembly.
3.
Ensure the distributor seats properly against
manifold.
4.
Ensure the distributor shaft is fully engaged in the
oil pump.
5.
Bolt the distributor hold down clamp to the
manifold.
6.
Replace the distributor cap.
7.
Replace the spark plug wires and check that they
are in the correct firing order.
9.4 Vacuum Line Connections
1.
Install vacuum hoses to the appropriate port on
the throttle body (See Fig 2). Use the diagrams
made during removal of the existing fuel system
to locate the correct port. The vacuum ports of
the throttle body are labeled in the figure to the
right.
Figure 2
10.0 SUPPLY AND RETURN FUEL SYSTEM INSTALLATION
The MPI fuel system is a fuel metering system based on a time/pressure principle. The longer the injector is open the lager the
amount of fuel per fueling event is delivered to the engine. Fuel pressure also plays a direct role in how much fuel is delivered
to the engine. The higher the fuel pressure the more fuel is delivered during the fueling event. It is crucial for the proper
operation of a high performance MPI system that the fuel system be installed and sized correctly. Unlike a carburetor where
low-pressure fuel is delivered at an "as need" rate, the MPI supply system must continuously deliver fuel at the correct high
pressure in a volume greater than the engine requires at maximum load. The excess fuel the injectors do not use is returned to
the fuel tank. At idle, most of the fuel is returned to the tank, but a wide-open throttle (WOT) under full load nearly all of the fuel
is used by the engine and only a small amount is returned to the fuel tank. An improperly installed or sized MPI supply fuel
system may deliver enough fuel at low engine speeds but will starve the engine at WOT.
10.1 Fuel Supply/Return System Description
The high pressure fuel supply system consists of the following sub-systems: the fuel pick-up, a coarse fuel pump pre-filter, the
high pressure electric fuel pump, the 10 micron high pressure fuel filter and a 3/8” ID fuel line (See Fig.3). The fuel pick-up
delivers fuel from the tank to the inlet of the fuel pump filter. From the filter the fuel line supplies filtered fuel to the high pressure
pump inlet. The high pressure electric fuel pump delivers pressurized fuel to the 10micron fuel filter, which in turn delivers
filtered pressurized fuel to the fuel rails, fuel injectors, and the fuel pressure regulator. The function of the regulator is to
maintain a constant fuel pressure of 300kPa (43.5psi). The outlet of the regulator returns the excess fuel back to the fuel tank.
The following section covers the installation of an in-line pump. Holley PN 12-920 is included with this kit. Holley includes both
a pre and post filter with the AVENGER MPFI system. Both of these filters are designed to connect to an EFI pressure rated
7
rubber hose. They are not designed for “AN” style plumbing. If AN lines and fittings are used, obtain AN style filters. AN fittings
are available for the 12-920 pump. PN 26-160 contains two -6 pump fittings and PN 26-180 contains two -8 pump fittings.
All of the fittings on the intake manifold are -6 AN fittings (except the internal threads of the fuel pressure regulator which have a
“Saginaw” thread. There are barbed adapters included that can be installed on the inlet and return fittings that can be used to
connect to high pressure rated rubber fuel hose.
10.2 Fuel Pressure Regulator
The function of the fuel pressure regulator is to provide constant fuel pressure for the fuel injectors. Constant fuel pressure is
essential to ensure an accurate fuel metering process. The fuel pressure regulator of the system is set to 300kPa (43.5 psi) to
match the flow characteristics of the fuel injectors. The pressure regulator is reference to the manifold pressure to ensure the
required differential pressure for the metering event. Thus at high manifold vacuum (i.e. idle) the fuel pressure gage will read a
fuel pressure that is slightly lower than 300kPa (43.5 psi) because the gage is referenced to atmospheric conditions and not to
the intake conditions. The pressure reading at idle will vary with the application as manifold vacuum changes from engine to
engine and from application to application.
The regulator included is adjustable. To adjust the fuel pressure: remove the vacuum reference line and turn the screw
clockwise to increase the pressure (or counter-clockwise to decrease the fuel). Fuel pressure can be lowered slightly or raised
to reduce or increase the amount of fuel the injectors add. This is usually only done when the injectors used need to have their
flow decreased at idle or increased at wide-open throttle. Make sure you input the actual pressure into the software in the
“Engine Parameters” section.
NOTE: Increasing the fuel pressure by 10 PSI (43.5 to 53.5) results in a fuel metering increase of about 10%. The same is
true when reducing the fuel pressure.
NOTE: If the fuel pressure is changed, make sure to change the “Actual System Pressure” in the Engine Parameters setup in
the software.
DANGER! INCREASING THE FUEL PRESSURE BEYOND THE OPERATING POINT OF THE FUEL PUMP MAY RESULT
IN POOR ENGINE PERFORMANCE AND COULD CAUSE FUEL LEAKAGE ON COMPONENTS THAT ARE
NOT RATED FOR EXCESSIVE HIGH FUEL PRESSURES. LEAKAGE OR BURSTING OF FUEL SYSTEM
COMPONENTS MAY RESULT IN A FIRE OR EXPLOSION HAZARD, WHICH COULD CAUSE SERIOUS
INJURY OR DEATH.
Figure 3
8
10.3 Fuel Pump Installation
DANGER!
NEVER GET UNDER A VEHICLE SUPPORTED ONLY BY A JACK. SERIOUS INJURY OR DEATH CAN
RESULT FROM VEHICLES FALLING OFF OF JACKS. BEFORE WORKING UNDERNEATH A VEHICLE,
SUPPORT SOLIDLY WITH JACK STANDS.
Most in-line high-pressure fuel pumps have limited suction characteristics, so they need to be mounted as low as possible and
should be mounted no higher than the bottom of the fuel tank. The pump can be mounted either horizontally or vertically. When
mounting the fuel pump, check to make sure that you have the fuel flow in the correct direction. This may sound like a foolish
reminder, but it is a common installation error. To prevent damage to the fuel pump before the fuel system is filled with fuel,
drip/spray some light lubricant (such as 10w motor oil) into the inlet side of the pump.
1.
Make sure fuel tank is properly vented.
2.
Mount the electric fuel pump as close to the fuel tank outlet as possible. Mounting the fuel pump in this manner will insure
that the pump will prime easily and purge fuel vapors in the fuel lines to insure faster starts.
DANGER! TAKE PRECAUTIONS TO ENSURE THAT ALL FUEL LINE ROUTINGS ARE AWAY FROM HEAT SOURCES,
SUCH AS THE ENGINE, CATALITIC CONVERTER OR EXHAUST PIPES. A FIRE OR EXPLOSION HAZARD
COULD CAUSE SERIOUS INJURY OR DEATH.
DANGER! ENSURE THAT THE FUEL PUMP MOUNTING LOCATION WILL NOT INTERFERE WITH ANY UNDER THE
VEHICLE COMPONENTS, ESPECIALLY AT THE EXTREME LIMITS OF THE SUSPENSION TRAVEL. A FIRE
OR EXPLOSION HAZARD COULD CAUSE SERIOUS INJURY OR DEATH.
3.
Connect the pump to the tank using 3/8” I.D. fuel hose. Connect the outlet of the pump to the steel line which runs to the
front of the vehicle with 3/8” I.D. fuel hose, depending on the diameter of the steel fuel line. All fuel hose used must meet
SAE J30 performance standards.
10.4 Fuel Line Mounting
DANGER! FAILURE TO USE A FUEL HOSE THAT MEETS SAE J30 STANDARDS COULD RESULT IN FUEL LEAKS. A
FUEL LEAK MAY RESULT IN A FIRE OR EXPLOSION HAZARD, WHICH COULD CAUSE SERIOUS INJURY
OR DEATH.
1.
If using existing fuel lines, inspect and replace any hose, clamps, or fuel line showing any sign of aging or does not meet
SAE J30 fuel hose specifications. If you are not using existing fuel lines, you will need a fuel line routed to and from the
engine compartment and fuel rails. Use a 3/8” steel fuel line available at any auto parts store. All steel fuel line must meet
SAE J526 standards. Any time a rubber hose is connected to a steel fuel line, the steel fuel line must have a “barb” or
“nipple” on it to properly retain the hose (along with hose clamps). Either use the proper tool to put a “nipple” on the end of
the tube (similar to the ends of the fuel filters), or use a compression fitting and a barded fitting adapter that is the proper
size for the lines used. Clamping a rubber hose to a steel line that has the end squarely cut off does not ensure a safe
connection.
DANGER! FAILURE TO USE STEEL FUEL LINE THAT MEETS SAE J526 STANDARDS COULD RESULT IN FUEL
LEAKS. A FUEL LEAK MAY RESULT IN A FIRE OR EXPLOSION HAZARD, WHICH COULD CAUSE SERIOUS
INJURY OR DEATH.
DANGER! TAKE PRECAUTIONS TO ENSURE THAT ALL FUEL LINE ROUTINGS ARE AWAY FROM HEAT SOURCES,
SUCH AS THE ENGINE, CATALYTIC CONVERTER, OR EXHAUST PIPES. A FIRE OR EXPLOSION HAZARD
COULD CAUSE SERIOUS INJURY OR DEATH.
DANGER! RIGID FUEL LINE TUBING SHOULD BE USED FOR UNDER VEHICLE RUNS, SUCH AS ALONG VEHICLE
FRAME RAILS OR UNDER FLOOR PANS. FAILURE TO DO SO IS A POTENTIAL FIRE OR EXPLOSION
HAZARD, WHICH COULD CAUSE SERIOUS INJURY OR DEATH.
2.
Anchor all fuel lines securely to solid chassis members at 1 ½ foot intervals using rubber coated steel clamps. Use of only
approved steel fuel line tubing will afford maximum fuel line protection against road hazards, gravel bombardment and
premature wearing due to flexing, temperature extremes, road salt, weather, etc.
10.5 Fuel Filters
WARNING! It is very important the fuel filters have the proper flow capacity, burst pressure rating and filter size. The
flow capacity of the filters must at least 60 gallons per hour (gph), and the filter size must be no bigger
than 10 microns for the high fuel pressure filter and not bigger than 75 microns for the fuel pump inlet
filter. The high-pressure fuel filter should be rated for at least for 150 psi burst pressure.
9
DANGER! FAILURE TO USE HIGH PRESSURE FUEL FILTER LINE RATED FOR A MINIMUM OF 100 PSI BURST
PRESSURE COULD RESULT IN FUEL LEAKS OR BURSTING OF THE FUEL FILTER. A FUEL LEAK MAY
RESULT IN A FIRE OR EXPLOSION HAZARD, WHICH COULD CAUSE SERIOUS INJURY OR DEATH.
The fuel filter supplied by Holley meets or exceeds the above specifications. Most filters for carburetor systems do not.
The fuel pump inlet filter (marked WIX 33033) must be plumbed between the fuel tank and the fuel pump. It should be mounted
as close to the fuel tank as possible and should be mounted no higher than the top of the fuel tank. The high-pressure fuel filter
should be plumbed between the fuel pump and the fuel rail. It should be mounted as close to the fuel rail as possible but should
not be mounted above the fuel rail level.
Be careful to ensure the suction part of the fuel system contains no air leaks. Air leaks are caused by holes and/or crevices so
small that they will not leak fuel. Just because fuel is not leaking out does not mean air is not leaking in. Common causes of air
leaks are not using thread sealing compound on fittings and cracks or holes in fuel lines. Air leaks could potentially cause fuel
pump failure and or inadequate fuel supply to the fuel rails.
10.6 Return Line Installation
DANGER! DO NOT USE THE VAPOR CANISTER LINES AS A FUEL RETURN LINE. POSSIBLE FUEL LEAKS MAY
CREATE A FIRE OR EXPLOSION HAZARD, CAUSING SERIOUS INJURY OR DEATH.
WARNING! Use only approved steel fuel line. The return fuel line should enter the fuel tank at the “fuel level sending
unit flange” or at the “filler neck”. The connection should be made below the flapper valve of the filler
neck. The filler neck or sending unit must be removed from the tank to perform this operation.
DANGER! PROPER INSTALLATION OF THE FUEL RETURN LINE MAY REQUIRE THE COMPLETE REMOVAL OF THE
FUEL TANK. THIS WORK SHOULD BE DONE BY A FUEL TANK SPECIALIST, WHO REGULARLY DOES
THIS WORK AND IS FAMILIAR WITH SAFETY REGULATIONS AND PRECAUTIONS NECESSARY TO DO
THIS WORK. IF A PERSON ATTEMPTS THIS WORK
WHO IS NOT FAMILIAR WITH THE SAFETY
REGULATIONS AND PRECAUTIONS, AN
EXPLOSION HAZARD MAY RESULT CAUSING
SERIOUS INJURY OR DEATH.
The fuel return line from the fuel pressure regulator must go back to
the fuel tank and enter the fuel tank with a fitting that has an internal
diameter of at least 3/8".
The internal thread on the fuel pressure regulator is a “Saginaw”
style thread and is internally sealed with an O-ring. This fitting
should not be over-tightened in the regulator or it will leak.
Returning fuel should be routed back to the tank away from the fuel
tank pick-up tube. This will allow air bubbles from the returned fuel
to dissipate before they are drawn into the pick-up tube.
There are several options including the following that meet the
above criteria for returning the fuel to the fuel tank.
Figure 4

Use a fitting already in the fuel tank

Use the vent fitting. Be very careful not to block the fuel vapor from escaping the tank.

Route the return line into the filler neck. This can be done by cutting the filler neck, Inserting a welded "T" fitting, and
securing the neck with multiple clamps.

Drill and weld a new fitting into the tank
NOTICE: For best performance of your fuel supply system an in tank pump is recommended. Such an installation can
be achieved by either buying a late model fuel tank or have your tank modified by professional companies
that install an in-tank pump with the required swirl pods and baffles.
DANGER! MODIFICATIONS TO FUEL TANKS SHOULD BE DONE BYFUEL TANK SPECIALISTS, WHO REGULARLY DO
THIS WORK AND ARE FAMILIAR WITH THE SAFETY REGULATIONS AND PRECAUTIONS NECESSARY. IF
A PERSON ATTEMPTS THIS WORK WHO IS NOT FAMILIAR WITH THE SAFETY REGULATIONS AND
PRECAUTIONS, AN EXPLOSION MAY RESULT CAUSING SERIOUS INJURY OR DEATH.
10
10.7 Oxygen Sensor Installation
10.7.1 Oxygen Sensor Mounting Procedure
NOTE: Never run the engine with the oxygen sensor installed if it is not plugged in and powered by the ECU, or it will be
damaged. If you need to plug the hole temporarily, use an O2 sensor plug or a spark plug with an 18mm thread.
NOTE: Someone should install the oxygen sensor boss that has experience welding exhaust systems. Any competent
exhaust shop is able to perform this task at a minimal cost.
WARNING! Use of leaded fuels will degrade the oxygen sensor over time and will result in incorrect exhaust gas
oxygen-content readings.
WARNING! Use of some RTV silicone sealers will destroy the oxygen sensor used with this product. Ensure the RTV
silicone sealant you use is compatible with oxygen sensor vehicles. This information should be found on
the RTV package.
Avenger EFI systems come with a Bosch wideband oxygen sensor. Make sure your sensor looks like Figure 5.
Figure 5
1.
Locate a position for the oxygen sensor as close to the engine as possible. If your vehicle has catalytic converters, the
oxygen sensor MUST be located between the engine and the catalytic converters. Good locations are in the drop pipe, or
in the “”Y” pipe on single exhaust systems. Pick a location that allows easy installation of the oxygen sensor, but will protect
the sensor from road hazards.
NOTE: Make sure there is a minimum of 3 feet of exhaust tubing after the location where the oxygen sensor is installed.
2.
Drill a 7/8” hole in the location picked for the sensor. Weld the threaded boss into the 7/8” hole. An old spark plug with
matching threads will avoid thread damage during the welding process. Weld all the way around the boss to insure a leak
proof connection. Install the oxygen sensor into the threaded boss and tighten securely. It is a good idea to add anti-seize
to the threads to aid in removal.
3.
On vehicles equipped with an AIR pump, the oxygen sensor must be mounted before the AIR injection into the exhaust, or
the AIR pump must be disconnected. Holley recommends that if the AIR is injected into both exhaust manifolds, mount the
oxygen sensor into the pipe immediately after the exhaust manifold. Disconnect the AIR pump tube from the exhaust
manifold and plug both ends. Check with local ordinances for the legality of this procedure in your area.
WARNING! Failure to disconnect the AIR pump or locating the oxygen sensor downstream from AIR injection will
result in an extremely rich mixture which could cause drivability problems and severe engine damage.
11
10.7.2 ECU Mounting
The ECU can be mounted inside the passenger compartment (preferable location), or in the engine compartment. If mounted in
the engine compartment, follow these guidelines:



The ECU should be located such that it isn’t being directly hit by water or road debris.
It should also be located such that it isn’t extremely close to exhaust manifolds or headers.
It should be mounted such that it is as far away from spark plug wires, CD ignition boxes, or other “electrically noisy”
devices as is reasonable possible.
The ECU comes with mounting hardware and vibration absorbers. Mount the vibration absorbers between the ECU feet and the
mounting location. Do not over-tighten the mounting hardware if the ECU is not mounted on a flat surface.
11.0 WIRING
The following overviews how to properly install the wiring harnesses for this system.
11.1 Important Wiring “Do’s and Don’ts”
An EFI system depends heavily on being supplied a clean and constant voltage source. The grounds of an electrical system are
just as important as the power side.
Avenger ECU’s contain multiple processing devices that require clean power and ground sources. The wiring harnesses for
them must be installed in such a manner that they are separated from “dirty” power and ground sources.
DO’S




Install the main power and ground directly to the battery.
Keep sensor wiring away from high voltage or “noisy/dirty” components and wiring, especially secondary ignition wiring
(plug wires), ignition boxes and associated wiring.
Properly solder and heat shrink any wire connections.
It is critical that the engine has a proper ground connection to the battery and chassis.
DON’TS

NEVER run high voltage or “noisy/dirty” wires in parallel (bundle/loom together) with any EFI sensor wiring. If wires
need to cross, try to do so at an angle.

Do not use the electric fan outputs to directly power a fan. They must only trigger a relay.

Do not use improper crimping tools.

Don’t use things like “t-taps”, etc. Use solder and heat shrink.

It is never recommended to splice/share signal wires (such as TPS, etc) between different electronic control units.
12.0 WIRING HARNESS INSTALLATION
12.1 Main Power/Battery Connection
The AVENGER ECU has a main battery power and ground connector on the right side of the ECU. The bottom position,
Terminal “A” is the ground. The upper position, Terminal “B” is the positive terminal. Always use the fused power cable with the
proper connectors supplied by Holley only.
Figure 6
12
13.0 PRIMARY HARNESS INSTALLATION AND SENSORS CONNECTION
These sections review the Main Harness installation and all of the sensor connections that must be completed. The Main
Harness is the primary harness that supports all the primary engine sensors, fuel and ignition. There are two main connectors
for this harness that plug into the ECU.
Figure 7
13.1 ECU Connectors
AVENGER ECU – The AVENGER ECU has two main connectors:

P1A - The first connector next to the USB connector is the “P1A” connector (34 pin). This connector is primarily an
“Input” connector. It contains all the sensor inputs and wide band oxygen sensor control.

P1B - The second connector is the “P1B” connector (26 pin). This connector is the “output” connector. It has 8 injector
outputs and outputs for other devices.
Figure 8
*USB is not used on Avenger EFI
13.2 Harness Routing
If the ECU is mounted in the interior, it will have to be routed through the firewall into the engine compartment. Use a 2” hole
saw to create a hole in a desired location if no other point of access is available. A grommet is supplied for a 2” hole to seal this
area.
If the ECU is mounted in the engine compartment, the hand-held tuning module cable will have to be routed to the “CAN”
connector on the main harness (located near the ECU connector main connector). This will require routing 1” x ½” connector
somewhere through the firewall.
Connect the P1A and P1B connectors of the main harness into the ECU.
About 12” from the ECU main connectors is a 40A Relay. This powers the injectors and fuel pump.
13
13.3 Sensor Connections & Outputs
The following indicates the primary sensors that are required to be connected. Each connector on the main harness is labeled
with the sensor name. The name on this label for each sensor is in parenthesis below.
13.3.1 Throttle Position Sensor (TPS)
Connect to the TPS which is located on the throttle body.
13.3.2 Manifold Air Pressure Sensor (MAP)
A 1 Bar MAP sensor is provided with all Holley EFI systems. Connect to the MAP sensor. Make sure that a vacuum line was
connected to the MAP sensor in previous steps.
Figure 9 TPS
Figure 10 MAP
13.3.3 Coolant Temperature Sensor (CTS)
Connect to the Coolant Temperature sensor which should have been installed in an engine coolant passage.
13.3.4 Manifold Air Temperature Sensor (MAT)
Connect to the Air Temperature Sensor. This is located in the throttle body unit.
Figure 11 CTS
Figure 12
13.3.6 Wide Band Oxygen Sensor (WB02)
Connect to the oxygen sensor connector to the oxygen sensor previously installed. If you need an extension cable, one is
available from Holley (P/N 534-199). The Avenger systems are intended to be used with a Bosch wide band oxygen sensor
supplied by Holley. Make sure yours is the same as the picture below:
Figure 13 WBO2
14
13.3.7 Fuel Pressure (Fuel)
A fuel pressure transducer connector is pre-installed in the main harness. The system is plug-and-play configured for a Holley
100 PSI pressure transducer (can be purchased under PN 554-102). If these are not connected to a pressure transducer, the
Fuel and Oil Pressure will read “LEr” on the hand-held display. This will not cause any issues. Connect to the transducer (if
installed).
13.3.8 Oil Pressure (Oil)
An oil pressure transducer connector is pre-installed in the main harness. The system is plug-and-play configured for a Holley
100 PSI pressure transducer (can be purchased under PN 554-102). If these are not connected to a pressure transducer, the
Fuel and Oil Pressure will read “LEr” on the hand-held display. This will not cause any issues. Connect to the transducer (if
installed).
Figure 14 Fuel
Figure 15 Oil
13.3.9 CANbus – Handheld (CAN)
The handheld controller is used for create of an initial calibration for the system, allows for simple tuning changes to be
performed, and is also used to view various information of the EFI system. It should be installed such the handheld controller
can be easily used in the passenger compartment. The handheld has two loose wires and one connector with orange wires.
Plug the connector into the main wiring harness into the plug marked “CAN”. This plug is located about 8 inches from the ECU
connector. The handheld controller also has a white and a black wire. The black wire should be run to a sound vehicle ground.
The white wire should be connected to a +12 volt source switched ignition source. The handheld does not have to be
powered/installed after the vehicle is up set up and running properly.
Figure 16 Harness to Handheld
Figure 17 Handheld
13.3.10 Knock Sensor (Knock)
The knock sensor connector is NOT used on Avenger systems.
Figure 18 Knock
15
13.3.11 Ignition (IGN) –
There is a 10 pin connector marked “IGN”. This is to connect to various ignition systems. This is not required for some
applications. See section 16.0 below for proper ignition wiring.
Figure 19 IGN (Shows Adapter for Small Cap Computer Controlled GM HEI Distributor)
14.0 PRIMARY OUTPUTS
14.1 Idle Air Control (IAC)
Connect to the idle air control motor which is installed in the throttle body.
14.2 Fuel Injector Outputs (INJ) and Fuel Injector Harness
Install the fuel injector harness on the fuel injectors. Each injector connector is labeled with the proper cylinder number. Then
connect the fuel injector harness to the injector connector on the main harness (marked INJ).
Figure 20 IAC
Figure 21 INJ
15.0 LOOSE WIRES
Figure 22
16
The following loose wires in the main wiring harness should be connected as follows on all systems. All of these wires come out
of the harness about 40” from the ECU connectors except for the “12V Switched” wire.
12V Switched – Color = Red/White – Should be connected to a clean +12 volt power source. Power source should only be
active when the ignition is on. Make sure source has power when engine is cranking as well (check with voltmeter). Not all
sources apply power when the ignition switch is in “cranking” position. This wire is located approximately 7” from the ECU
connectors. Refer to Figure 24.
12V Battery – Color = Red – Should be connected directly to the battery. This powers the fuel pump and fuel injectors. This
wire is protected by a fuse in a sealed fuse holder. The fuse holder is located about 9” from the ECU connector. A fuse is preinstalled (20A).
12V Fuel Pump – Color = Green - Used to directly power a fuel pump (+12 volt). Do not use this wire to power fuel pumps that
require over 10-12 Amps. For high current pumps, use this wire to trigger a separate relay and use larger gauge wire to feed
the pump - 10 gauge is recommended. The pump that include with Avenger systems draws less than 10 Amps and can be
powered directly by this wire.
The fuel pump also requires a ground wire. Run a wire from the negative side of the fuel pump (marked “-“ on the Holley pump
in this kit). Connect it to a solid chassis/frame ground.
Figure 23
Points Output – Color = White – This wire is NOT used with the Avenger system. Tape up the end or install heat shrink on it.
Chassis Ground – Color = Black – Connect to a chassis ground point that has excellent connectivity with both the engine and
the battery.
“Coil – ” – Color = Yellow – See section 15.0 below. This is an RPM input wire used for some applications.
16.0 IGNITION/ENGINE SPEED INPUT
The most important signal for the ECU is the Engine Speed input. It is critical that this is configured and wired correctly or poor
performance will result.
There are 3 engine speed options on the Avenger systems. Each one is wired differently. If these are wired incorrectly, it is
easily possible to permanently damage the ECU so pay close attention to proper wiring. These options are described below and
wiring diagrams are supplied below the descriptions:
OPTION 1) “Coil –“ engine speed input – Use this if:

You are using a stock type mechanical advance distributor with a stock inductive ignition coil. Examples of this would
be any older style points distributor, a 1974-1981 GM large cap HEI.

Do NOT use this input if you are using an aftermarket Capacitive Discharge (CD) ignition system such as a MSD,
Mallory, or others. The ECU will be damaged if you connect to a capacitive discharge type ignition coil.
NOTE: Using this input, the EFI will NOT control the ignition timing of the engine. The timing will be based on the distributor
initial, mechanical, and vacuum advance, just like it did with a carburetor.
OPTION 2) “Tach Out” engine speed input 
If you are using an aftermarket Capacitive Discharge (CD) ignition system such as a MSD, Mallory, or others, you need
to connect to the “Tach Out” connection or wire these systems provide. This is a 12 volt square wave output.
17
CAUTION! NEVER, NEVER connect any of the EFI wires to the coil on any CD type ignition system. The ECU will be
permanently damaged!
NOTE: Using this input, the EFI will NOT control the ignition timing of the engine. The timing will be based on the distributor
initial, mechanical, and vacuum advance, just like it did with a carburetor.
OPTION 3) “GM Small Cap HEI” Computer Controlled Distributor –

Small and Big Block Chevy engines can use a small cap GM HEI computer controlled distributor that was available on
factory GM vehicles from the 1980’s through mid 1990’s. This distributor provides an engine speed signal to the EFI,
as well as allowing the EFI to control the ignition timing.
Figure 24 GM Small Cap HEI Distributor and Close Up of Distributor
17.0 WIRING
OPTION 1 – “Coil –“ – Option one uses the “Yellow Wire” for engine speed input. The yellow wire is a loose wire located 40”
from the ECU connectors. It is bundled with several other loose wires. The following two diagrams show how to wire to the two
most common applications which are:
1)
Any General Motors engine equipped with a factory large cap HEI distributor equipped with mechanical/vacuum
advance (Figure 25).
2)
Any engine equipped with a factory mechanical advance distributor and separate canister style coil. This would include
any points style distributor (Figure 26).
Figure 25 below shows how to connect to a large cap HEI distributor.
Figure 25
18
Figure 26 below shows how to connect to a factory style ignition with a canister style coil.
Figure 26
OPTION 2 – “Tach Out’ – If using an aftermarket Capacitive Discharge (CD) ignition system, you need to connect to the
“Tachometer Output” connection on the ignition box. To do so, you need to install the included ignition adapter that comes with
your kit. This adapter will have a single “yellow/black” wire (yellow wire with a black stripe) that you will connect to the tach out
on the ignition box. This output usually is typically a spade type connector on the side of the box, or a wire coming out of the
box. This adapter looks like this:
Figure 27
Connect it to the main EFI harness to the connector marked “IGN” (Ignition). Connect the yellow/black wire to the “tach out”
connection on your ignition box. If you don’t know what wire this is, contact the tech service department for the ignition system
you purchased.
Figure 28
19
OPTION 3 - “GM Small Cap HEI” Computer Controlled Distributor – An ignition adapter to connect to a computer controlled
small cap HEI distributor is included with all Small and Big Block Chevy multi-port Avenger EFI kits. This adapter looks like:
Figure 29
Connect this adapter to the main EFI harness to the connector marked “IGN” (Ignition). Connect the other end to the 4 pin
connector on the HEI distributor. You will need to supply the wiring to connect the distributor to the coil.
Figure 30 shows how to wire when NOT using an aftermarket CD box. Figure 31 Shows how to wire when using an
aftermarket CD box.
Figure 30
20
Figure 31
18.0 ADDITIONAL OUTPUTS
There are 3 optional outputs available on the system that can be use for the following features:
-
Air Conditioning Shutdown at wide open throttle
Electric Fan #1 output
Electric Fan #2 output
There outputs are located in the “Input/Output” connector. This connector is located about 27 inches from the ECU connector
and contains 8 pins. 3 of these are used for the features mentioned above. A harness is available to plug into this connector
under Holley PN 558-400 that provides a mating plug in connector and additional harness length. If you wish to not purchase
this mating harness, but want to use these options, you can remove a single wire from the main harness Input/Output connector
and solder an additional length of wire on for the features you wish to use.
The following indicates proper wiring for these features.
A/C Shutdown – This output will provide a +12 volt output a defined throttle position. This output can be used to trigger a relay
that deactivates the A/C at higher throttle positions. This may require the installation of a 5 pole relay in the existing A/C wiring.
This wire is located in pin E of the 8 pin Input/Output connector and is Grey with a Yellow stripe.
Electric Fan #1 output – This output will provide a ground output to trigger a relay used for a cooling fan. This output should
never be directly connected to a fan, but the relay that powers the fan. It should be connected to the ground trigger of the relay.
This wire is located in pin G of the 8 pin Input/Output connector and is Grey with a Black stripe.
Electric Fan #2 output – This output will provide a ground output to trigger a relay used for a cooling fan. This output should
never be directly connected to a fan, but the relay that powers the fan. It should be connected to the ground trigger of the relay.
This wire is located in pin G of the 8 pin Input/Output connector and is Grey with a Green stripe.
Figure 32
21
APPENDIX 1.0
Pinout
The following shows pins that are used on Avenger systems. Pins that are not used on Avenger systems, but may have wires
populated in the harness, are denoted with an asterisk (*).
P1A
Connector
Pin
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
A20
A21
A22
A23
A24
A25
A26
A27
A28
A29
A30
A31
A32
A33
A34
Function
Coil – Input
Fuel Pump Out (+12v) (10A Max)
*
*
TPS Input
*
WB1 COMPR2
WB1 Shield
WB HTR Switched +12v Input
Manifold Air Temp Input
*
*
Cam/Crank Ground
Gauge Digital Output
WB1 COMPR1
WB1 VS-/IP+
Sensor Ground
Engine Coolant Temp Input
Oil Pressure Input
*
Cam Sync Input / Ignition Bypass Output
Map Sensor Input
CAN Lo
WB1 VS+
Sensor +5v
NOT USED
EST/Spout Output
*
Crank Speed Input
Fuel Pressure Input
CAN Hi
WB1 IP+
WB HTR +
P1B Connector
Pin
Function
B1
IAC A Lo
B2
IAC A Hi
B3
Fan #2 Output (ground)
B4
Injector F Output
B5
Injector G Output
B6
Injector H Output
B7
Injector E Output
B8
IAC B Lo
B9
IAC B Hi
B10
Fan #1 Output (ground)
B11
*
B12
A/C Shutdown (+12v)
B13
Injector D Output
B14
*
B15
*
B16
*
B17
*
B18
*
B19
Injector A Output
B20
EST 12V Output
B21
*
B22
*
B23
*
B24
*
B25
Injector C Output
B26
Injector B Output
Holley Performance Products
1801 Russellville Road
Bowling Green, KY 42101
Technical Service: 1-270-781-9741 Fax: 1-270-781-9772
For online help, please refer to the Technical Information section of our website: www.holley.com
199R10553 wf
Date: 3-28-11
22
24
Download PDF
Similar pages