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. Disconnect the distributor ventilation vacuum line from the air intake duct.
4. Disconnect the IAT sensor electrical connector (w/o WS6).
5. Disconnect the MAF sensor electrical connector (w/ WS6).
6. Remove the air intake duct (w/o WS6).
7. Remove the air intake duct with the MAF sensor (w/ WS6).
8. Disconnect the TP sensor and the IAC valve electrical connectors.
9. Disconnect the fuel and EVAP pipes from the retainer on the accelerator cable shield.
10. Remove the accelerator cable shield.
11. Disconnect the accelerator control cable and the cruise control cable from the throttle body.
12. Disconnect the vacuum lines from the throttle body.
13. Disconnect the coolant hoses from the throttle body.
14. Remove the throttle body attaching bolts.
15. 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.

16. Clean the gasket sealing surfaces.

1. Install the throttle body with a new gasket.
2. Install the throttle body attaching bolts.

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

Refer to the

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

in General Information.
3. Connect the coolant hoses to the throttle body.
4. Connect the vacuum lines to the throttle body.
5. Connect the accelerator control cable and the cruise control cable.
6. Install the accelerator cable shield.
7. Install the fuel and EVAP pipes into the retainer on the accelerator cable shield.
8. Connect the TP sensor and the IAC valve electrical connectors.
9. Install the air intake duct (w/o WS6).
10. Install the air intake duct with the MAF sensor (w/ WS6).
11. Connect the IAT sensor electrical connector (w/o WS6).
12. Connect the MAF sensor electrical connector (w/ WS6).
13. Connect the distributor ventilation vacuum line to the air intake duct.
14. Refill the cooling system.
15. Connect the negative battery cable.
16. With the engine OFF, check to see that the accelerator pedal is free. Depress the accelerator pedal to the floor and release.
17. Reset the IAC valve pintle position.

17.1.

Depress the accelerator pedal slightly.

17.2.

Start the engine.

17.3.

Release the accelerator pedal.

17.4.

Run the engine for 5 seconds.

17.5.

Turn the ignition OFF for 10 seconds.

17.6.

Restart the engine.

17.7.

Check for proper idle operation.