Skylark V6-3100 3.1L VIN M SFI (1996)
Fuel Injector: Description and Operation
The Sequential Multiport Fuel Injection (SFI) fuel injector is a solenoid (3) operated device controlled by the PCM The PCM energizes the
solenoid which opens a valve (1) to allow fuel delivery onto the director plate (2).
The fuel is injected under pressure in a conical spray pattern at the opening of the intake valve. Excess fuel not used by the injectors passes
through the fuel pressure regulator before being returned to the fuel tank.
A fuel injector which is stuck partly open will cause a loss of fuel pressure after engine shut down, causing long crank times.
