Fuel Injector (Typical)

Fuel Injector (Typical):

The SFI fuel injector is a solenoid operated device controlled by the PCM. The PCM energizes the solenoid which opens a valve in order to allow fuel delivery.

The fuel is injected under pressure in a conical spray pattern at the opening of the intake valve. Any excess fuel not used by the injectors passes through the fuel pressure regulator before being returned to the fuel tank.

When the PCM energizes the injector coil, a normally closed valve ball opens allowing the fuel to flow past a director plate to the injector outlet.

A fuel injector which is stuck partly open causes a loss of fuel pressure after engine shut down. This may cause long crank times to be noticed on some engines.