GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1999 🢒 Tracker - 2WD 🢒 Engine 🢒 Engine Controls - 1.6L 🢒 Throttle Body Assembly Replacement

Removal Procedure
  1. Remove the intake air inlet duct from the throttle body.

    2. Object Number: 456246 Size: SH
  2. Remove the breather hose (1) from the throttle body.
  3. Disconnect the TP sensor electrical connector (3).
  4. Disconnect the IAC valve electrical connector (2).
  5. Drain the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.

    6. Object Number: 470862 Size: SH
  6. Disconnect the lower coolant hose (1) from the throttle body.
  7. Disconnect the upper coolant hose (2) from the throttle body.

    8. Object Number: 481135 Size: SH
  8. Disconnect the accelerator control cable (1) from the throttle body by rotating the throttle lever (2) to WOT and removing the cable end from the slot.

    9. Object Number: 470864 Size: SH
  9. Remove the two nuts/two bolts (1) from the throttle body.
  10. Remove the throttle body (2) and gasket (3) from the intake manifold (4).

    11. Object Number: 470860 Size: SH
  11. Clean any throttle body gasket (2) that remains on the intake manifold (1).

Installation Procedure

    Object Number: 470864 Size: SH
  1. Install a new gasket (3) and the throttle body (2) onto the intake manifold (4).

    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.

  2. Secure the throttle body to the intake manifold with the two nuts/two bolts (1)

    3. Tighten
    Tighten the bolts to 25 N·m (18 lb ft).


    Object Number: 481135 Size: SH
  3. Connect the accelerator control cable (1) to the throttle lever (2). Adjust the accelerator control cable as necessary. Refer to Accelerator Cable Adjustment .

    4. Object Number: 470862 Size: SH
  4. Connect the lower coolant hose (1) to the throttle body.
  5. Connect the upper coolant hose (2) to the throttle body.

    6. Object Number: 456246 Size: SH
  6. Connect the IAC valve electrical connector (2).
  7. Connect the TP sensor electrical connector (3).
  8. Connect the breather hose (1) to the throttle body.
  9. Install the intake air inlet duct to the throttle body.