GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1998 🢒 LeSabre 🢒 Body and Accessories 🢒 Wiring Systems 🢒 Throttle Body Inspection and Cleaning

Removal Procedure

    Object Number: 179039 Size: SH
  1. Remove the IAT (Intake Air Temperature) sensor electrical connector (1) from the IAT sensor (2).

    2. Object Number: 210987 Size: SH
  2. Remove the intake air duct assembly.

    3. Object Number: 180140 Size: SH
  3. Remove the snap ring (3) at the air inlet screen (2) on the throttle body (1).
  4. Inspect the throttle body bore and throttle valve plate for deposits. It is necessary to open the throttle valve to inspect all surfaces.

    5. Notice: Do not use any solvent that contains Methyl Ethyl Ketone (MEK). This solvent may damage fuel system components.

  5. Clean the throttle body bore and throttle valve plate using a clean shop towel with GM Top Engine Cleaner, P/N 1052626 or AC-Delco Carburetor Tune-Up Conditioner, P/N X66-P, or equivalent product.

Installation Procedure

    Object Number: 180140 Size: SH
  1. Install the snap ring (3) at the air inlet screen (2) in to the throttle body (1).

    2. Object Number: 210987 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.

  2. Install the intake air duct assembly.

    3. Tighten
    Tighten the air intake tube clamp to 2 N·m (18 lb in).


    Object Number: 179039 Size: SH
  3. Install the IAT sensor electrical connector (1) to the IAT sensor (2).