GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 674702  Size: SH
  1. Disconnect the mass air flow (MAF)/intake air temperature (IAT) sensor electrical connector (4).

  2. Object Number: 360851  Size: SH
  3. Loosen the air cleaner outlet duct clamp at the MAF/IAT sensor.
  4. Remove the air cleaner outlet duct from the MAF/IAT sensor.

  5. Object Number: 858230  Size: SH

    Notice: Handle the MAF/IAT sensor carefully. Do not drop the MAF/IAT sensor. Do not damage the screen located at the air inlet end of the MAF/IAT. Do not touch the sensing elements. Do not allow solvents and lubricants to come in contact with the sensing elements. Use a small amount of SPO P/N 12345884 lubricant or the soap based equivalent in order to aid in the installation.

  6. Loosen the MAF/IAT sensor clamp at the air cleaner box.
  7. Remove the MAF/IAT sensor.

Installation Procedure

Important: Ensure to point the arrow on the MAF/IAT sensor away from the air cleaner box.


    Object Number: 858230  Size: SH
  1. Install the MAF/IAT sensor.
  2. 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. Tighten the MAF/IAT sensor clamp at the air cleaner box.
  4. Tighten
    Tighten the clamp to 4 N·m (35 lb in).


    Object Number: 360851  Size: SH
  5. Install the air cleaner outlet duct to the MAF/IAT sensor.
  6. Tighten the air cleaner outlet duct clamp at the MAF/IAT sensor.
  7. Tighten
    Tighten the clamp to 4 N·m (35 lb in).


    Object Number: 674702  Size: SH
  8. Connect the MAF/IAT sensor electrical connector (4).