Harley-Davidson EFI System User manual

EFI System is a computer controlled engine management system that uses fuel injectors controlled by the computer. No carburetor. The computer uses sensors to gather information from the engine, then calculates the required fuel needed. The amount of fuel injected into the engine is determined by how long the injector is cycled open. Known as “Pulse width”.

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EFI System User Manual | Manualzz

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Key features

  • Computer controlled engine management system
  • Uses fuel injectors controlled by the computer
  • Uses sensors to gather information from the engine
  • Calculates the required fuel needed
  • The amount of fuel injected into the engine is determined by how long the injector is cycled open
  • Closed loop operation
  • Open loop operation
  • Adaptive fuel control
  • Volumetric Efficiency
  • Ion-Sensing

Frequently asked questions

The EFI system uses fuel injectors to inject fuel into the engine cylinders. The amount of fuel injected is controlled by the ECM, which uses sensors to gather information from the engine and calculates the required fuel needed. The amount of fuel injected is determined by the length of time the injector is open, known as “Pulse width”.

The EFI system offers several advantages over traditional carburetor systems, including improved fuel economy, reduced emissions, and better performance.

Tuning the EFI system involves adjusting the ECM settings to optimize engine performance. This can be done using a tuning device, which allows you to view and modify various engine parameters, such as fuel maps and spark timing.

The oxygen sensor monitors the amount of oxygen in the exhaust gases and provides feedback to the ECM, which uses this information to adjust the fuel mixture for optimal combustion.

In open loop operation, the ECM uses pre-programmed tables to determine the fuel mixture. In closed loop operation, the ECM uses the oxygen sensor feedback to adjust the fuel mixture for optimal combustion.
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