GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

Notice: Do not use solvent of any type when cleaning the gasket surfaces on the intake manifold and the throttle body assembly, as damage to the gasket surfaces and throttle body assembly may result.

Use care in cleaning the gasket surfaces on the intake manifold and the throttle body assembly, as sharp tools may damage the gasket surfaces.


    Object Number: 15093  Size: SH
  1. Remove the injector sight shield.
  2. Drain the radiator coolant.
  3. Remove the air intake tube.

  4. Object Number: 155466  Size: SH
  5. Remove the IAC valve sensor electrical connector.

  6. Object Number: 155464  Size: SH
  7. Remove the MAF sensor electrical connector.

  8. Object Number: 178680  Size: SH
  9. Remove the TP sensor electrical connector.

  10. Object Number: 12265  Size: SH
  11. Remove the accelerator control and cruise control cables from the throttle body lever.

  12. Object Number: 12258  Size: SH
  13. Remove the accelerator control and cruise control cables from the throttle bracket.

  14. Object Number: 179374  Size: SH
  15. Remove the electrical harness retainer clip (1) from the accelerator control cable bracket (3).

  16. Object Number: 180061  Size: SH
  17. Remove the vacuum lines from the throttle body noting location.

  18. Object Number: 12243  Size: SH
  19. Remove the throttle body support bracket .

  20. Object Number: 12270  Size: SH
  21. Remove the nuts and bolts holding the throttle body to the intake manifold using a wrench on the manifold side of the inserts to prevent the inserts from rotating in the manifold casting.
  22. Remove the throttle body assembly.
  23. Clean the gasket surface on the intake manifold and the throttle body assembly.

Installation Procedure

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


    Object Number: 12270  Size: SH
  1. Install the new gasket, and new inserts and studs if necessary.
  2. Install the throttle body assembly.
  3. 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.

  4. Install the throttle body retaining nuts and bolts (3).
  5. Tighten
    Tighten the throttle body retaining nuts and bolts to 10 N·m (7 lb ft).


    Object Number: 12258  Size: SH
  6. Install the accelerator control and cruise control cables to the accelerator cable bracket at the throttle body

  7. Object Number: 12265  Size: SH
  8. Install the accelerator control and cruise control cables to the throttle body lever.
  9. Check for complete throttle opening and closing positions by operating the accelerator pedal. Also check for poor carpet fit under the accelerator pedal.

  10. Object Number: 179374  Size: SH
  11. Install the electrical harness retainer clip and harness to the accelerator control cable bracket.

  12. Object Number: 180061  Size: SH
  13. Install the vacuum lines to throttle body as noted on removal.

  14. Object Number: 155466  Size: SH
  15. Install the IAC valve sensor electrical connector.

  16. Object Number: 155464  Size: SH
  17. Install the MAF sensor electrical connector.

  18. Object Number: 178680  Size: SH
  19. Install the TP sensor electrical connector.
  20. Install the air intake tube.
  21. Refill the radiator to replace the lost coolant.

  22. Object Number: 49594  Size: SH
  23. Install the injector sight shield.