GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 307286  Size: SH
  1. Remove the air intake duct.

  2. Object Number: 389031  Size: SH
  3. Disconnect the accelerator control cable and the cruise control cable from the throttle body.
  4. Disconnect the vacuum hose from the throttle body.

  5. Object Number: 389028  Size: SH
  6. Disconnect the throttle position (TP ) sensor and idle air control (IAC) valve electrical connectors.

  7. Object Number: 220620  Size: SH
  8. Disconnect the coolant hose from the throttle body.

  9. Object Number: 220621  Size: SH
  10. Disconnect the coolant hose from the vapor vent pipe.

  11. Object Number: 260174  Size: SH
  12. Remove the throttle body attaching nuts.
  13. Remove the throttle body and the gasket. Discard the gasket.
  14. 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 a cold immersion type cleaner. The throttle valve has a factory applied sealing compound DAG material is applied to the outside edge of the valve and the throttle bore to prevent air bypass at closed throttle. Strong solvents or brushing removes the material. To clean the throttle body following disassembly, use a spray type cleaner such as GM X-66A or GM P/N 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.

  15. Clean the gasket sealing surfaces.

Installation Procedure


    Object Number: 260174  Size: SH
  1. Install the throttle body with a new gasket.
  2. 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 attaching nuts.
  4. Tighten
    Tighten the nuts to 10 N·m (89 lb in).


    Object Number: 220620  Size: SH
  5. Connect the coolant hose to the throttle body.

  6. Object Number: 220621  Size: SH
  7. Connect the coolant hose to the vapor vent pipe.

  8. Object Number: 389031  Size: SH
  9. Connect the accelerator control cable and the cruise control cable to the throttle body.

  10. Object Number: 389028  Size: SH
  11. Connect the TP sensor and the IAC valve electrical connectors.
  12. Connect the vacuum hose to the throttle body.

  13. Object Number: 307286  Size: SH
  14. Install the air intake duct.
  15. With the engine OFF, verify that the accelerator pedal moves freely. Depress the accelerator pedal to the floor and release the pedal.
  16. Perform the Idle Learn Procedure. Refer to Idle Learn .