Throttle Body Assembly Replacement

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 in Engine Cooling.

2. Remove the air intake duct (3) to the throttle body. Refer to Air Cleaner Assembly Replacement.






3. Disconnect the throttle position (TP) sensor (2) and the idle air control (IAC) valve (1) electrical connectors.

4. Disconnect the crankcase ventilation hose from the throttle body.






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







6. Disconnect the coolant hose.






7. Remove the throttle body attaching bolts.

8. Remove the throttle body and the gasket. Discard the gasket.










9. Glean the gasket sealing surfaces.

Notice: 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 (Canadian P/N 993026). 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.


Installation Procedure

1. Install the throttle body with a new gasket.

Notice: Refer to the Fastener Notice in Cautions and Notices.

2. Install the throttle body attaching bolts.

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

3. Connect the coolant hose.









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






5. Connect the crankcase ventilation hose to the throttle body.

6. Connect the TP sensor (2) and the IAC valve (1) electrical connectors.






7. Install the air intake duct (3) to the throttle body. Refer to Air Cleaner Assembly Replacement.

8. Refill the cooling system. Refer to Draining and Filling Cooling System in Engine Cooling.

9. With the engine OFF, inspect to see that the accelerator pedal is free. Depress the accelerator pedal to the floor and release.