Fuel Charging and Controls
The fuel rail:
- delivers fuel to the fuel injectors.
- receives fuel from the fuel supply tube.
CAUTION:
Do not hold the throttle plate open with any object that could scratch the bore or plate while servicing or cleaning the throttle body (TB). Refer to Throttle Body .
The throttle body (TB):
- controls air supply to the upper intake manifold by positioning the throttle plate.
- is not adjustable.
- must be removed from the vehicle to be cleaned.
The fuel injector:
- is electrically operated by the PCM.
- has an internal solenoid that opens a needle valve to inject fuel into the lower intake manifold.
- atomizes the fuel as the fuel is delivered.
- is deposit resistant.
The fuel rail pressure and temperature sensor:
- measures the pressure and temperature of the fuel in the fuel rail and sends these signals to the PCM.
- uses intake manifold vacuum as a pressure reference. For removal and installation, refer to ELECTRONIC ENGINE CONTROLS article for the procedure.