Fuel Charging and Controls

FUEL CHARGING AND CONTROLS

The fuel injection supply manifold:
- delivers fuel to the individual fuel injectors.
- receives fuel from the fuel supply line.

The throttle body:
- controls air supply to the upper intake manifold by positioning the throttle plate.
- connects the accelerator cable and, if equipped, the speed control actuator cable to the throttle lever.
- is not adjustable.
- cannot be cleaned.

The fuel injectors:
- are electrically operated by the powertrain control module (PCM).
- atomize the fuel as the fuel is delivered.
- are deposit-resistant.
- each have an internal solenoid that opens a needle valve to inject fuel into the lower intake manifold.

The fuel pressure relief valve is used to inspect and relieve fuel pressure.

The fuel pressure regulator:
- maintains constant fuel pressure throughout the fuel system and to the fuel injectors.
- is spring-loaded and operated by intake manifold vacuum.

The A/C compressor clutch control relay (if A/C equipped):
- is controlled by the PCM.
- interrupts A/C clutch operation during engine start or manual transmission clutch engagement to reduce engine load.

The fuel pump relay engages the fuel pump when energized by the PCM.