Sierra 1500 2WD V8-5.3L Hybrid (2004)
Fuel Injector: Description and Operation
Fuel System Description
FUEL INJECTORS
The fuel injector assembly is a solenoid device controlled by the PCM that meters pressurized fuel to a single engine cylinder. The PCM energizes the
injector solenoid to open a normally closed ball valve. This allows the fuel to flow into the top of the injector, past the ball valve, and through a director
plate at the injector outlet. The director plate has 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 the fuel to become further atomized and vaporized before entering the combustion
chamber. This fine atomization improves fuel economy and emissions.
