An eight-digit part identification number (3) is stamped on the throttle body casting. Refer to this number if servicing, or part replacement is required.

A build date is stamped on the throttle body which indicates the day of year (1) and the year (2) that the throttle body was manufactured.

1. Disconnect the negative battery cable.
2. Partially drain the cooling system.
3. Remove the air intake duct.
4. Disconnect the TP sensor and the IAC valve electrical connectors.
5. Remove the accelerator cable shield.
6. Disconnect the accelerator control cable from the throttle body.
7. Disconnect the vacuum lines from the throttle body.
8. Disconnect the coolant hoses from the throttle body.
9. Remove the throttle body attaching bolts.
10. Remove the throttle body and the gasket. Discard the gasket.

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 valves have a factory applied sealing compound (DAG material is applied to the outside edge of each 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.

11. Clean the gasket sealing surfaces.

1. Install the throttle body with a new gasket.

Notice: Refer to Fastener Notice in the Preface section.

2. Install the throttle body attaching bolts.

Tighten
Tighten the throttle body attaching bolts to 25 N·m (18 lb ft).

3. Connect the coolant hoses to the throttle body.
4. Connect the vacuum lines to the throttle body.
5. Connect the accelerator control cable.
6. Install the accelerator cable shield.
7. Connect the TP sensor and the IAC valve electrical connectors.
8. Install the air intake duct.
9. Refill the cooling system.
10. Connect the negative battery cable.
11. Engine OFF, verify the accelerator pedal does not bind. Depress the accelerator pedal to the floor and release.
12. Reset the IAC valve pintle position by performing the following:

12.1.

Depress the accelerator pedal slightly.

12.2.

Start the engine.

12.3.

Release the accelerator pedal.

12.4.

Run the engine for 5 seconds.

12.5.

Ignition OFF for 10 seconds.

12.6.

Restart the engine.

12.7.

Check for proper idle operation.