GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC K Sierra - 4WD 🢒 Engine 🢒 Engine Controls - 4.3L 🢒 Secondary Air Injection Pump Replacement

Removal Procedure

    Object Number: 334930 Size: SH
  1. Remove the brace (8) attached to the fender and cowl.
  2. Disconnect the electrical connector from the AIR pump (1).
  3. Disconnect the electrical connector from the AIR Solenoid Valve (6).

    4. Object Number: 349261 Size: MH
  4. Disconnect the electrical connector from the relay (7).
  5. Remove the AIR hose clamp (12) from the AIR Shut-off valve hose (10).
  6. Remove the hose (10) from the AIR Shut-off valve (13).
  7. Remove the vacuum line (5) from the AIR solenoid valve (6).

    8. Object Number: 334923 Size: SH
  8. Remove the AIR pump assembly hold down fastener (2) and block (3).
  9. Remove the AIR pump assembly (1).

    10. Object Number: 349261 Size: MH
  10. Release the AIR pump rubber mounting posts (9) from the AIR pump (2).
  11. Remove the AIR hoses (3, 14) from the AIR pump (2).
  12. Remove the AIR pump (2).

Installation Procedure

    Object Number: 349261 Size: MH
  1. Install the AIR pump (2) onto the rubber mounting posts (9).
  2. Connect the hoses (3, 14) to the AIR pump (2).

    3. Object Number: 334923 Size: SH
  3. Install the AIR pump assembly (1) into the vehicle.
  4. Install the AIR pump assembly hold down block (3) and the fastener (2).

    5. 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.

  5. Install the AIR pump assembly hold down mounting bolt.

    6. Tighten
    Tighten the hold down fastener (2) to 25.0 N·m (18 lb ft).


    Object Number: 349261 Size: MH
  6. Connect the hose (10) to the AIR Shut-off valve (13).
  7. Connect the hose clamp (12) to the AIR Shut-off valve hose (10).
  8. Connect the electrical connector to the AIR pump (2).
  9. Connect the electrical connector to the AIR Solenoid Valve (6).
  10. Connect the electrical connector to the AIR Pump relay (7).
  11. Connect the vacuum line (5) to the AIR solenoid valve (6).

    12. Object Number: 334930 Size: SH
  12. Install the brace (8) to the fender and cowl.
  13. Check the AIR system for proper operation.