|Modes of EFI
||A mode of injection describes the timing and sequence of injecting fuel.
|Electronic fuel injection
||EFI is now the most common fuel system, the injectors spray fuel into the air/intake ports for combustion inside the engine.
|Idle speed control systems
||Idle speed control systems maintain a suitable idle speed to prevent stalling, when additional loads are placed on the engine.
|Feedback & looping
||Feedback from the exhaust gas oxygen sensor is used to maintain closed loop control of the air-fuel mixture.
|Cold start systems
||Cold start systems provide additional fuel during starting conditions, according to engine temperature.
||The vane-type airflow sensor measures the quantity of air flowing into the engine by deflecting a spring-loaded vane across a potentiometer. This provides a signal voltage to the ECU.
||Depending on the application, different kinds of sensors measure different properties of the air entering the engine, including its temperature, volume, density, and mass.
|Variable intake manifold system
||Variable intake manifold systems vary the effective manifold pipe length, to extend the torque curve over a wider RPM range.
||The ECU continuously receives information from sensors in the form of electrical signals, to determine injector pulse width.
|EFI wiring diagram||Identification of the sensors and their inputs allows easier identification of the wiring diagram for any given system.|