GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2002 🢒 GMC MD Steel Tilt (W Model) 🢒 Engine 🢒 Engine Controls - 5.0L and 5.7L 🢒 Throttle Body Assembly Replacement

Removal Procedure

    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. Remove the engine cover. Refer to Engine Cover Replacement in Interior Trim.
  3. Remove the air cleaner outlet duct.

    4. Object Number: 325550 Size: SH
  4. Remove the cruise control cable.

    5. Object Number: 325556 Size: SH
  5. Remove the accelerator cable.

    6. Object Number: 325557 Size: MH
  6. Remove the cruise control and accelerator cables and the mounting bracket.

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

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

    9. Object Number: 424550 Size: SH
  9. Remove the air cleaner adaptor stud.

    10. Object Number: 442105 Size: SH
  10. Remove the throttle body fasteners.

    11. Object Number: 442103 Size: SH
  11. Remove the throttle body assembly.
  12. Remove and discard the flange seal.

Installation Procedure
  1. Clean the seal surface on the intake manifold.

    2. Object Number: 442103 Size: SH
  2. Install a new flange seal.
  3. Install the throttle body assembly.

    4. Object Number: 442105 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.

  4. Install the throttle body assembly retaining fasteners.

    5. Tighten
    Tighten the fasteners to 25 N·m (18 lb ft).


    Object Number: 424550 Size: SH
  5. Install the air cleaner adaptor stud.

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


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

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

    8. Object Number: 325557 Size: MH
  8. Install the accelerator and cruise control cables and the mounting bracket.

    9. Object Number: 325556 Size: SH

    Important: Make sure the accelerator and cruise control cables are properly routed. Improper routing may cause the throttle plate to remain open.

  9. Install the accelerator cable.

    10. Object Number: 325550 Size: SH
  10. Install the cruise control cable.
  11. Install the air cleaner outlet duct.
  12. Install the engine cover. Refer to Engine Cover Replacement in Interior Trim.
  13. Connect the negative battery cable.

    14. Important: The accelerator pedal should operate freely without binding between closed and full throttle.

  14. Depress and release the accelerator pedal in order to test for binding