Fuel Injectors

The fuel injector assembly is a solenoid-operated device, controlled by the PCM, that meters pressurized fuel to a single engine cylinder. The PCM energizes the fuel injector solenoid (1) which opens a ball valve (2) allowing fuel to flow past the ball valve, and through a director plate (3) at the injector outlet. The director plate has machined holes that control the fuel flow, generating a conical spray pattern of finely atomized fuel at the injector tip. Fuel from the tip is directed at the intake valve, causing the fuel to become further atomized and vaporized before entering the combustion chamber. A fuel injector that is stuck partly open causes a loss of pressure after the engine is shut down, so long crank times may be noticed on some engines. Dieseling can also occur because some fuel could be delivered to the engine after the ignition is turned OFF.