GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1999 🢒 Riviera 🢒 Engine 🢒 Engine Controls - 3.8L 🢒 Throttle Position Sensor Replacement

Removal Procedure

    Object Number: 49594 Size: SH
  1. Remove the fuel injection sight shield. Refer to Fuel Injector Sight Shield Replacement .

    2. Object Number: 178680 Size: SH
  2. Remove the TP (Throttle Position) sensor electrical connector from the TP sensor.

    3. Object Number: 178693 Size: SH
  3. Remove the two TP sensor attaching screws from the throttle body.

    4. Object Number: 178694 Size: SH
  4. Remove the TP sensor from the throttle body.

Installation Procedure

    Object Number: 178694 Size: SH
  1. With the throttle valve in the normal closed position, install the TP sensor in to the throttle body assembly.

    2. Object Number: 178693 Size: SH
  2. Apply thread-locking compound on the screws. Loctite 262®, GM P/N 1052624, or equivalent should be used.

    3. 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 two TP sensor attaching screws.

    4. Tighten
    Tighten the TP sensor attaching screws to 2 N·m (18  lb in).


    Object Number: 178680 Size: SH
  4. Install the TP sensor electrical connector to the TP sensor.

    5. Object Number: 49594 Size: SH
  5. Install the fuel injection sight shield. Refer to Fuel Injector Sight Shield Replacement .

    6. Tighten
    Tighten the fuel injection sight shield to 2 N·m (18 lb in).