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

Removal Procedure

    Important: The MAF sensor on this engine is attached to the throttle body assembly.


    Object Number: 203882 Size: SH
  1. Remove the fuel injection sight shield. Refer to Fuel Injector Sight Shield Replacement .

    2. Object Number: 155464 Size: SH
  2. Disconnect the MAF sensor electrical connector from the MAF sensor.

    3. Object Number: 378168 Size: SH
  3. Remove the bolts (9) holding MAF sensor (1) to throttle body.
  4. Remove the MAF sensor (1) from the throttle body.

Installation Procedure

    Object Number: 378168 Size: SH
  1. Carefully position the MAF sensor (1) to the throttle body.
  2. Install the 2 bolts (9) holding the MAF sensor to the throttle body.

    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.

    Tighten
    Tighten the bolts to 3 N·m (27 lb in).


    Object Number: 155464 Size: SH
  3. Connect the MAF sensor electrical connector to the MAF sensor.

    4. Object Number: 203882 Size: SH
  4. Install the fuel injection sight shield. Refer to Fuel Injector Sight Shield Replacement .