GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2005 🢒 LeSabre 🢒 Engine 🢒 Engine Controls - 3.8L (L36 and L67) 🢒 Throttle Body Assembly Replacement

Removal Procedure
  1. Remove the fuel injection 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 cleaner intake duct. Refer to Air Cleaner Inlet Duct Replacement .

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

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

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

    7. Object Number: 179147 Size: SH
  7. Remove the cruise control cable (2) from the accelerator control bracket (4) and throttle body lever (3). Refer to Cruise Control Cable Replacement in Cruise Control.

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

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

    10. Object Number: 180061 Size: SH
  10. Remove the vacuum hoses from the throttle body noting location.

    11. Object Number: 203920 Size: SH
  11. Remove the throttle body support bracket.

    12. Object Number: 203948 Size: SH
  12. Remove the 3 nuts and studs holding the throttle body to the intake manifold.
  13. Remove the throttle body assembly from the intake manifold.

    14. 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.

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

    15. Object Number: 12246 Size: SH
  15. Remove the accelerator controls cable bracket from the throttle body if the throttle body is being replaced.

Installation Procedure

    Object Number: 12246 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.

  1. Install the accelerator controls bracket to the throttle body if necessary.

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


    Object Number: 203948 Size: SH
  2. Install the new gasket, new inserts and studs if necessary.
  3. Install the throttle body assembly.
  4. Install the throttle body retaining nuts.

    5. Tighten
    Tighten the fasteners to 10 N·m (89 lb in).


    Object Number: 203920 Size: SH
  5. Install the throttle body support bracket.

    6. Tighten
    Tighten the fasteners to 10 N·m  (89 lb in).


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

    7. Object Number: 179374 Size: SH
  7. Install the electrical harness retainer clip (1) to the accelerator control cable bracket (3) if previously removed.

    8. Object Number: 179148 Size: SH

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

  8. Install the accelerator control cable (2) to the accelerator control bracket and throttle body lever (3). Refer to Accelerator Control Cable Replacement .

    9. Object Number: 179147 Size: SH
  9. Install the cruise control cable (2) to the accelerator control bracket (4) and throttle body lever (3). Refer to Cruise Control Cable Replacement in Cruise Control.

    10. Object Number: 155464 Size: SH
  10. Connect the mass air flow (MAF) sensor electrical connector to the MAF sensor.

    11. Object Number: 178680 Size: SH
  11. Connect the throttle position (TP) sensor electrical connector to the TP sensor.

    12. Object Number: 155466 Size: SH
  12. Connect the idle air control (IAC) valve electrical connector to the IAC valve.
  13. Install the air cleaner intake duct. Refer to Air Cleaner Inlet Duct Replacement .
  14. Refill the radiator coolant. Refer to Cooling System Draining and Filling in Engine Cooling.
  15. Install the fuel injection sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical.