GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2004 🢒 Monte Carlo 🢒 Body 🢒 Wiring Systems 🢒 Mass Airflow Sensor Replacement

Removal Procedure

    Object Number: 811623 Size: SH
  1. Remove the positive crankcase ventilation (PCV) valve tube (4) from the air cleaner intake duct.
  2. Disconnect the intake air temperature (IAT) sensor electrical connector (3).
  3. Disconnect the mass air flow (MAF) sensor electrical connector (5).
  4. Loosen the clamps (2,6) and remove the air cleaner intake duct with the MAF sensor from the throttle body and the air cleaner housing cover (8).
  5. Loosen the clamp and remove the MAF sensor from the air cleaner intake duct.

Installation Procedure

    Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 811623 Size: SH
  1. Install the MAF sensor to the air cleaner intake duct.

    2. Tighten
    Tighten the clamp to 2 N·m (18 lb in).

  2. Install the air cleaner intake duct with the MAF sensor to the throttle body and the air cleaner housing cover (8).

    3. Tighten
    Tighten the clamps to 2 N·m (18 lb in).

  3. Connect the MAF sensor electrical connector (5).
  4. Connect the IAT sensor electrical connector (3).
  5. Install the PCV valve tube (4) to the air cleaner intake duct.
  6. Start and idle the engine.
  7. Inspect the air intake duct for leaks.