Fuel Charging and Controls

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 Computers and Control Systems for the procedure.