Fuel Injector Assembly

Component Location:

CAUTION: This composite fuel rail design utilizes a unique injector clip design. This clip design does not permit the rail and injector assembly to be pressurized with fuel pump pressure when the rail assembly is not secured in the engine manifold. Pressurizing the rail assembly without the injector secured in the engine manifold may cause high pressure fuel to bypass the upper injector O-ring seal resulting in a fuel leak.

Do Not apply fuel pressure to the fuel rail assembly unless the fuel rail assembly is properly secured in the engine manifold.

The fuel injector assembly is a solenoid-operated device, controlled by the VCM, that meters pressurized fuel to a single engine cylinder. The VCM 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 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 shut down, so 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.