GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Isuzu 🢒 2004 🢒 Ascender - 4WD 🢒 Engine 🢒 Engine Controls - 4.2L 🢒 Secondary Air Injection Pipe Replacement

Removal Procedure
  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

    2. Object Number: 1297763 Size: SH
  2. Disconnect both the air inlet and air outlet pipe from the secondary air injection reaction (AIR) pump.
  3. Lower the vehicle.

    4. Object Number: 1297756 Size: SH
  4. Remove the cylinder head. Refer to Cylinder Head Replacement in Engine Mechanical - 4.2L.
  5. Remove the bolt and fir-tree fasteners securing the AIR pipe to the cylinder head.

Installation Procedure

    Object Number: 1297756 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.

  1. Install the bolt and fir-tree fasteners securing the AIR pipe to the cylinder head.

    2. Tighten
    Tighten the bolt to 10 N·m (89 lb in).

  2. Install the cylinder head. Refer to Cylinder Head Replacement in Engine Mechanical - 4.2L.
  3. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

    4. Object Number: 1297763 Size: SH
  4. Connect both the air inlet and air outlet pipe to the AIR pump.
  5. Lower the vehicle.