Impala V6-3.5L VIN N (2006)
Fuel Injector: Description and Operation
FUEL INJECTORS
The Multec 2 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 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 four 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.
