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: 49594  Size: SH
  1. Remove the injector sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical.
  2. Drain the radiator coolant. Refer to Cooling System Draining and Filling in Engine Cooling.
  3. Remove the air intake duct. Refer to Air Cleaner Assembly Replacement .

  4. Object Number: 155466  Size: SH
  5. Disconnect the idle air control (IAC) valve electrical connector.

  6. Object Number: 155464  Size: SH
  7. Disconnect the mass air flow (MAF) sensor electrical connector.

  8. Object Number: 178680  Size: SH
  9. Disconnect the throttle position (TP) sensor electrical connector.

  10. Object Number: 179339  Size: SH
  11. Disconnect the accelerator and cruise controls cable (1) . Refer to Accelerator Control Cable Replacement .

  12. Object Number: 12258  Size: SH
  13. Remove the accelerator controls cable bracket. Refer to Accelerator Control Cable Bracket Replacement .

  14. Object Number: 180061  Size: SH
  15. Disconnect the vacuum line from the throttle body.

  16. Object Number: 510393  Size: SH
  17. Remove the nut (2) from the air injection pipe (1) if applicable.

  18. Object Number: 153576  Size: MH
  19. Remove the exhaust crossover. Refer to Exhaust Crossover Pipe Replacement in Engine Exhaust.

  20. Object Number: 510497  Size: SH
  21. Remove the throttle body support bracket.

  22. Object Number: 203948  Size: SH
  23. Remove the fasteners holding the throttle body to the intake manifold.
  24. Remove the throttle body assembly.
  25. Clean the gasket surface on the intake manifold and the throttle body assembly.

Installation Procedure


    Object Number: 203948  Size: SH
  1. Install the new gasket.
  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. Reinstall the throttle body 3 retaining nuts.
  5. Tighten
    Tighten the throttle body retaining nuts to 10 N·m (89 lb in).


    Object Number: 510497  Size: SH
  6. Install the throttle body support bracket and bolts.
  7. Tighten
    Tighten the throttle body support bracket bolts to 10 N·m (89 lb in).


    Object Number: 153576  Size: MH
  8. Install the exhaust crossover. Refer to Exhaust Crossover Pipe Replacement in Engine Exhaust.

  9. Object Number: 12258  Size: SH
  10. Install the accelerator controls cable bracket. Refer to Accelerator Control Cable Bracket Replacement .
  11. Reinstall the air injection pipe to the throttle body if applicable.
  12. Tighten
    Tighten the nut to 10 N·m (89 lb in).


    Object Number: 180061  Size: SH
  13. Connect the vacuum line to throttle body.

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

  16. Object Number: 155464  Size: SH
  17. Connect the MAF sensor electrical connector.
  18. Connect the IAT electrical connector.

  19. Object Number: 178680  Size: SH
  20. Connect the TP sensor electrical connector.
  21. Install the air intake duct. Refer to Air Cleaner Assembly Replacement .
  22. Refill the radiator to replace the lost coolant. Refer to Cooling System Draining and Filling in Engine Cooling.

  23. Object Number: 49594  Size: SH
  24. Install the injector sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical.