Notice: Do not subject a throttle body assembly which contains the following components to an immersion cleaner or a strong solvent:

Clean the throttle body bore and throttle valve plate on the vehicle using a clean shop towel with GM Top Engine Cleaner, P/N 1052626 or AC-Delco Carburetor Tune-Up Conditioner, P/N X66P, or equivalent. Remove and disassemble the throttle body for cleaning if the deposits are excessive. Refer to Idle Air Control Valve Replacement for IAC valve removal and Throttle Position Sensor Replacement for TP sensor removal. After disassembly, clean the throttle body using a parts cleaning brush. DO NOT immerse the throttle body in any cleaning solvent.

An 8-digit part identification number is stamped on the bottom of the throttle body casting. Refer to this number if servicing or part replacement is required.

Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

1. Disconnect the negative battery cable.



2. Disconnect the IAT sensor harness connector.



3. Disconnect the breather tube from the air cleaner outlet duct.



4. Remove the air cleaner outlet duct retaining wing nut.



5. Loosen the clamp on the outlet of the MAF sensor.
6. Lift the air cleaner outlet duct from the throttle body and remove the assembly from the MAF sensor.



7. Remove the air cleaner adapter stud.



8. Disconnect the cruise control cable from the throttle body.



9. Disconnect the accelerator cable from the throttle body.



10. Remove the nuts retaining the accelerator cable routing bracket and position bracket aside.



11. Remove the stud and nuts retaining the accelerator control cable bracket and position bracket aside.



12. Disconnect the IAC valve harness connector.



13. Disconnect the TP sensor harness connector.



14. Remove the throttle body retaining studs.



15. Remove the throttle body assembly.
16. Discard the throttle body seal.

1. Clean the seal surface on the intake manifold.



2. Install the throttle body assembly with a new seal.




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.

3. Install the throttle body assembly retaining studs.

Tighten
Tighten the studs to 9 N·m (80 lb in).




4. Install the accelerator control cable bracket using the mounting stud and nuts.

Tighten
Tighten the stud and nuts to 12 N·m (108 lb in).




5. Install the accelerator cable routing bracket using the mounting nuts.

Tighten
Tighten the accelerator cable routing bracket nuts to 9 N·m (75 lb in).





Notice: Check for unrestricted and complete throttle opening and closing positions by operating the accelerator pedal in order to prevent vehicle damage. Also check for poor carpet fit under the accelerator pedal. Throttle should operate freely without bind between full closed and wide open throttle.

6. Install the accelerator cable onto the throttle body.



7. Install the cruise control cable onto the throttle body.



8. Connect the TP sensor harness connector.



9. Connect the IAC valve harness connector.



10. Install the air cleaner adapter stud.

Tighten
Tighten the stud to 8 N·m (72 lb in).




11. Install the air cleaner outlet duct.



12. Tighten the air cleaner outlet duct wing nut.
13. Secure the air cleaner outlet duct to the MAF sensor.

Tighten
Tighten the air cleaner outlet duct clamp to 4 N·m (35 lb in) .




14. Connect the breather tube to the air cleaner outlet duct.



15. Connect the IAT sensor harness connector.
16. Connect the negative battery cable.

Important: The accelerator pedal should operate freely without binding between closed and wide open throttle.

17. Check the accelerator pedal operation.

17.1.

Turn ON the ignition leaving the engine OFF.

17.2.

Using a scan tool, observe the parameter for the TP sensor.

17.3.

Depress the accelerator pedal to the floor.

17.4.

Release the accelerator pedal.

17.5.

Verify the throttle position has gone from 0 % to 100 % and back to 0 %.