C 2500 Yukon XL 2WD V8-8.1L VIN G (2002)
Fuel Injector: Description and Operation
Fuel Injectors
The Multec 2 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 high-impedance (12.2 ohms) injector solenoid (1) to open a normally closed ball valve (2). This allows fuel to flow into the top of
the injector, past the ball valve, and through a director plate (3) at the injector outlet. The director plate has two machined holes that control the fuel
flow, generating a spray of finely atomized fuel at the injector tip. Fuel from the injector tip is directed at the intake valve, causing it to become further
atomized and vaporized before entering the combustion chamber. An injector stuck partly open can cause a loss of pressure after engine shutdown.
Consequently long cranking times would be noticed on some engines.
