Caprice V8-265 4.3L VIN W MFI (1995)
Fuel Injector: Description and Operation
Fuel Injector
The top-feed fuel injector assembly is a solenoid operated device, controlled by the Powertrain Control Module (PCM), that meters pressurized fuel to a
single engine cylinder. The PCM energizes the injector solenoid. which opens a ball valve, allowing fuel to flow past
the ball valve, and through a recessed flow director plate. The director plate has six machined holes that control the fuel flow, generating a conical spray
pattern of finely atomized fuel at the injector tip.
Fuel is directed at the intake valve, causing it to become further atomized and vaporized before entering the combustion chamber.
An injector that is stuck partly open would cause loss of pressure after engine shutdown. Consequently, long cranking times would be noticed on some
engines. Dieseling could also occur, because some fuel could be delivered to the engine after the ignition is turned "OFF".
