GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2000 🢒 LeSabre 🢒 Engine 🢒 Engine Controls - 3.8L 🢒 Throttle Body Assembly Replacement

Removal Procedure
  1. Turn OFF the ignition.
  2. Drain the radiator coolant. Refer to Cooling System Draining and Filling in Engine Cooling.

    3. Object Number: 49594 Size: SH
  3. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical.

    4. Object Number: 471749 Size: SH
  4. Remove the electrical connector (2) from the intake air temperature (IAT) sensor (1).

    5. Object Number: 210987 Size: SH
  5. Remove the intake air duct from the throttle body.

    6. Object Number: 155466 Size: SH
  6. Remove the electrical connector from the idle air control (IAC) valve.

    7. Object Number: 178680 Size: SH
  7. Remove the electrical connector from the throttle position (TP) sensor.

    8. Object Number: 155464 Size: SH
  8. Remove the electrical connector from the mass air flow (MAF) sensor.

    9. Object Number: 179339 Size: SH
  9. Remove the cruise control cable (1) from the accelerator controls bracket (2). Refer to Cruise Control Cable Replacement in Cruise Control.

    10. Object Number: 475708 Size: SH
  10. Remove the accelerator control cable (1) from the accelerator controls bracket (2). Refer to Accelerator Control Cable Replacement .

    11. Object Number: 179147 Size: SH
  11. Remove the cruise control cable (2) from the throttle body lever (3). Refer to Cruise Control Cable Replacement in Cruise Control.

    12. Object Number: 179148 Size: SH
  12. Remove the accelerator control cable (2) from the throttle body lever (3). Refer to Accelerator Control Cable Replacement .

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

    14. Object Number: 180061 Size: SH
  14. Remove the vacuum hoses from the throttle body, noting the locations.

    15. Object Number: 510393 Size: SH
  15. Remove the nut (2) from the air injection pipe (1), if applicable.
  16. Remove the exhaust crossover. Refer to Exhaust Crossover Replacement in Engine Mechanical.

    17. Object Number: 510497 Size: SH
  17. Remove the throttle body support bracket bolts from the throttle body.

    18. Object Number: 203948 Size: SH
  18. Remove the 3 nuts and the studs holding the throttle body to the intake manifold.

    19. 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.

  19. Clean the gasket surface on the intake manifold and the throttle body assembly.

    20. Remove the throttle body assembly from the intake manifold.


    Object Number: 12246 Size: SH
  20. Remove the accelerator controls bracket from the throttle body if the throttle body is being replaced. Refer to Accelerator Control Cable Bracket Replacement .

Installation Procedure

    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.


    Object Number: 12246 Size: SH
  1. Install the accelerator controls bracket to the throttle body, if necessary.

    2. Tighten
    Tighten the bracket bolts to 16 N·m (12 lb ft).


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

    5. Object Number: 510497 Size: SH
  5. Install the throttle body support bracket to the throttle body.

    6. Tighten
    Tighten the nuts to 10 N·m (7 lb ft).

  6. Install the exhaust crossover. Refer to Exhaust Crossover Replacement in Engine Mechanical.

    7. Object Number: 510393 Size: SH
  7. Install the air injection pipe (1) to the throttle body, if applicable.

    8. Tighten
    Tighten the nut to 10 N·m (7 lb ft).


    Object Number: 475708 Size: SH
  8. Install the accelerator controls cable (1) to the bracket (2) at the throttle body. Refer to Accelerator Control Cable Replacement .

    9. Object Number: 179339 Size: SH
  9. Install the cruise control cable (1) to the bracket at the throttle body (2). Refer to Cruise Control Cable Replacement in Cruise Control.

    10. Object Number: 12265 Size: SH

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

  10. Install the accelerator control to the throttle body lever.

    11. Object Number: 179147 Size: SH
  11. Install the cruise control cable (2) to the throttle body lever (3).

    12. Object Number: 179374 Size: SH
  12. Check for complete throttle opening and closing positions by operating the accelerator pedal. Also check for proper carpet fit under the accelerator pedal.
  13. Install the electrical harness retainer clip (1) and the harness to the accelerator control cable bracket (3).

    14. Object Number: 180061 Size: SH
  14. Install the vacuum hoses to the throttle body, as noted on removal.

    15. Object Number: 210987 Size: SH
  15. Install the intake air duct to the throttle body and air cleaner assembly.

    16. Tighten
    Tighten the clamp to 2 N·m (18 lb ft).


    Object Number: 471749 Size: SH
  16. Install the electrical connector (2) to the IAT sensor (1).
  17. Refill the radiator to replace the lost coolant. Refer to Cooling System Draining and Filling in Engine Cooling.
  18. Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical.