Cutlass V6-191 3.1L VIN M SFI (1998)
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Fuel Injector: Description and Operation
DESCRIPTION
The Sequential Multipoint 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 to be noticed on some
engines.