Bravada 2WD L6-4.2L VIN S (2002)
Fuel Injector: Description and Operation
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
high-impedance (12.0 ohms) injector solenoid (2) to open a normally closed ball valve (3). This allows 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.
