GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

Important: An eight 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.


    Object Number: 424550  Size: SH
  1. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
  2. Remove the air cleaner adapter stud.

  3. Object Number: 325550  Size: SH
  4. Disconnect the cruise control cable from the throttle body.

  5. Object Number: 325556  Size: SH
  6. Disconnect the accelerator cable from the throttle body.

  7. Object Number: 424533  Size: SH
  8. Remove the nuts retaining the accelerator cable routing bracket.
  9. Position the bracket aside.

  10. Object Number: 424537  Size: SH
  11. Remove the stud and nuts retaining the accelerator control cable bracket.
  12. Position the bracket aside.

  13. Object Number: 312513  Size: SH
  14. Disconnect the IAC valve harness connector.

  15. Object Number: 12885  Size: SH
  16. Disconnect the TP sensor harness connector.

  17. Object Number: 12852  Size: SH
  18. Remove the throttle body retaining studs.

  19. Object Number: 12853  Size: SH
  20. Remove the throttle body assembly.
  21. Discard the throttle body seal.

Installation Procedure

  1. Clean the seal surface on the intake manifold.

  2. Object Number: 12853  Size: SH
  3. Install the throttle body assembly with a new seal.

  4. Object Number: 12852  Size: SH

    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.

  5. Install the throttle body assembly retaining studs.
  6. Tighten
    Tighten the studs to 9 N·m (80 lb in).


    Object Number: 424537  Size: SH
  7. Install the accelerator control cable bracket using the mounting stud and nuts.
  8. Tighten
    Tighten the stud and nuts to 12 N·m (106 lb in).


    Object Number: 424533  Size: SH
  9. Install the accelerator cable routing bracket using the mounting nuts.
  10. Tighten
    Tighten the accelerator cable routing bracket nuts to 9 N·m (80 lb in).


    Object Number: 325556  Size: SH

    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.

  11. Install the accelerator cable onto the throttle body.

  12. Object Number: 325550  Size: SH
  13. Install the cruise control cable onto the throttle body.

  14. Object Number: 12885  Size: SH
  15. Connect the TP sensor harness connector.

  16. Object Number: 312513  Size: SH
  17. Connect the IAC valve harness connector.

  18. Object Number: 424550  Size: SH
  19. Install the air cleaner adapter stud.
  20. Tighten
    Tighten the stud to 8 N·m (71 lb in).

  21. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
  22. Important: The accelerator pedal should operate freely without binding between closed and wide open throttle.

  23. Inspect the accelerator pedal operation.
  24. 12.1. Turn ON the ignition, with the engine OFF.
    12.2. Using a scan tool, observe the parameter for the TP sensor.
    12.3. Depress the accelerator pedal to the floor.
    12.4. Release the accelerator pedal.
    12.5. Verify the throttle position has gone from 0-100 percent and back to 0  percent.