Throttle Body Assembly Replacement

REMOVAL PROCEDURE




1. Partially drain the cooling system in order to remove the hoses at the throttle body. Refer to Draining and Filling Cooling System (5.7 L) in Cooling System.
2. Disconnect the IAT sensor and the MAF sensor electrical connectors.




3. Remove the air intake duct.




4. Disconnect the TP sensor (2) and IAC valve (1) electrical connectors.
5. Disconnect the crankcase ventilation hose from the throttle body.




6. Disconnect the cruise control cable at the throttle body lever.




7. Disconnect the accelerator control cable at the throttle body lever.




8. Disconnect the coolant hose from the vapor vent pipe.




9. Disconnect the coolant hose from the radiator.




10. Remove the throttle body attaching bolts.
11. Remove the throttle body and the gasket. Discard the gasket.

NOTE: In order to prevent damage to the sealing surfaces, carefully use sharp tools in cleaning the old gasket from the aluminum surfaces.

IMPORTANT:
^ Do Not soak the throttle body in cold immersion type cleaner. The throttle valve has a factory applied sealing compound (DAG material is applied to the outside edge of the valve and the throttle bore) to prevent air bypass at closed throttle. Strong solvents or brushing will remove the material. To clean the throttle body following disassembly, use a spray type cleaner such as GM X-66A or GM 1052626. Use a shop towel to remove heavy deposits.

^ The TP sensor and the IAC valve are electrical components and should NOT come in contact with solvent or cleaner, as damage may result.

12. Clean the gasket sealing surfaces.

INSTALLATION PROCEDURE




1. Install the throttle body with a new gasket.

NOTE: Refer to the Fastener Notice in Service Precautions.

2. Install the throttle body attaching bolts.

Tighten
Tighten the throttle body attaching bolts to 12 N.m (106 lb in).




3. Connect the coolant hose to the radiator.




4. Connect the coolant hose to the vapor vent pipe.




5. Connect the accelerator control cable to the throttle body lever.




6. Connect the cruise control cable to the throttle body lever.




7. Connect the crankcase ventilation hose to the throttle body.
8. Connect the TP sensor (2) and the IAC valve (1) electrical connectors.




9. Install the air intake duct.




10. Connect the IAT sensor and the MAF sensor electrical connectors.
11. Refill the cooling system. Refer to Draining and Filling Cooling System (5.7 L) in Cooling System.
12. With the engine OFF, check to see that the accelerator pedal is free. Depress the accelerator pedal to the floor and release.
13. Perform the Idle Learn Procedure. Refer to PCM Idle Learn Procedure. PCM Idle Learn Procedure