GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2000 🢒 Yukon - 4WD 🢒 Engine 🢒 Engine Controls - 4.8L, 5.3L, and 6.0L 🢒 Secondary Air Injection Check Valve and Check Valve Pipe Replacement - Bank 1

Removal Procedure

    Object Number: 260106 Size: SH

    Caution: Allow the engine to cool before servicing the secondary air injection AIR system in order to reduce the chance of severe burns.

  1. Remove the clamp from the check valve.
  2. Disconnect the AIR hose from the check valve.

    3. Object Number: 260103 Size: SH
  3. Remove the check valve from the left side AIR pipe.
  4. Remove the left AIR pipe from the exhaust manifold.
  5. Before replacing a check valve, test the valve for proper operation.
    6. 5.1. Install a vacuum pump to the nipple side of the check valve, AIR pump side.
    5.2. Pump the vacuum pump to 10 inches Hg and observe the gauge.
    5.3. Replace the check valve if the vacuum bleeds down to zero within 5 seconds.

Installation Procedure

    Object Number: 260103 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 check valve onto the AIR pipe.

    2. Tighten
    Tighten the check valve to the AIR pipe to 23N·m (17 lb ft)

  2. Connect the AIR pipe to the exhaust manifold.

    3. Tighten
    Tighten the AIR pipe to the exhaust manifold to 20N·m (15 lb ft).


    Object Number: 260106 Size: SH
  3. Install the AIR hose to the check valve.
  4. Install the check valve clamp.