GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2002 🢒 Firebird 🢒 Engine 🢒 Engine Controls - 5.7L 🢒 Manifold Absolute Pressure Sensor Replacement

Removal Procedure

    Object Number: 208459 Size: SH
  1. Remove the fuel rail assembly. Refer to Fuel Injection Fuel Rail Assembly Replacement .

    2. Important: If the vehicle is equipped with a manual transmission, go to step 5.

  2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  3. Remove the transmission fluid level tube bolt.
  4. Lower the vehicle.

    5. Object Number: 492232 Size: MH
  5. Remove the positive crankcase ventilation (PCV) heat exchange cable fastener (3).
  6. Remove the PCV hose (2) from the intake manifold.
  7. Remove the PCV hose (5) from the right bank port.
  8. Remove the PCV valve pipe from the left rocker arm cover.
  9. Release the PCV hose assembly from the mounting brackets (4).
  10. Move the PCV hose assembly (1) aside.

    11. Object Number: 55819 Size: SH
  11. Disconnect the MAP sensor electrical connector.

    12. Object Number: 58838 Size: SH
  12. Twist the MAP sensor forward in order to release the sensor from the retainer.
  13. Pull the sensor upward.

Installation Procedure

    Object Number: 58838 Size: SH

    Important: Before you install the sensor, lightly coat the MAP sensor seal with clean engine oil.

  1. Install the MAP sensor. Push the MAP sensor down in order to engage the sensor into the retainer.

    2. Object Number: 55819 Size: SH
  2. Connect the MAP sensor electrical connector.

    3. Object Number: 492232 Size: MH
  3. Position the PCV hose assembly (1) for reassembly.
  4. Insert the PCV hose assembly to the mounting brackets (4).
  5. Install the PCV valve pipe in the left rocker arm cover.
  6. Install the PCV hose (5) to the right bank port.
  7. Install the PCV hose (2) to the throttle body.

    8. 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.

  8. Install the PCV heat exchange cable fastener (3).

    9. Tighten
    Tighten the PCV heat exchange cable fastener to 12 N·m (106 lb in).

  9. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

    10. 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.

  10. Position the transmission fluid level indicator tube, and install the tube bolt.

    11. Tighten
    Tighten the tube bolt to 50 N·m (37 ft lb).

  11. Lower the vehicle.
  12. Install the fuel rail assembly. Refer to Fuel Injection Fuel Rail Assembly Replacement .