Fuel Charging Assembly

Throttle Body, Upper and Lower Manifolds

Pre-Service Procedures

The fuel charging assembly consists of the air throttle body, and the upper and lower intake manifolds. Prior to service or removal of the fuel charging assembly, the following Steps must be taken:

1. Open hood and install protective covers.

2. Disconnect battery ground cable and secure it out of the way.

3. Remove fuel cap and release tank pressure.

4. Release pressure from fuel system. Refer to Section 10-01 for fuel system pressure relief procedures. A pressure relief (Schrader) valve on the fuel rail assembly is provided for this procedure.

Post-Service Procedures

After the service is complete and the fuel charging assembly is installed onto engine, the following Steps must be taken:

1. Install fuel cap at tank.

2. Connect battery ground cable.

3. Add engine coolant if required.

4. Turn ignition switch ON/OFF several times without starting engine to check for fuel leaks.

    CAUTION: The fuel system is normally pressurized to 276 kPa (40 psi).

   NOTE: Check all connections at fuel rails, push connect fittings, etc.

5. Start engine and warm to operating temperature. Check for coolant leak if coolant was removed.

6. Perform powertrain control module (PCM) Self-Test to check systems function. Refer to the Powertrain Control/Emissions Diagnosis Manual.