GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2008 🢒 Lucerne 🢒 Engine 🢒 Engine Mechanical - 3.8L 🢒 Secondary Air Injection Shutoff and Check Valve Replacement

Removal Procedure

    Object Number: 1755977 Size: SH
  1. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
  2. Disconnect the brake booster vacuum hose from the intake manifold. Reposition the hose out of the way.
  3. Disconnect the engine harness electrical connector from the secondary air injection (AIR) shutoff and check valve.
  4. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
  5. Remove the intake manifold cover bracket bolts (2) and bracket (1).
  6. Remove the AIR shutoff and check valve pipe to exhaust manifold nuts (3).
  7. Lower the vehicle.

    8. Object Number: 1755972 Size: SH
  8. Remove the AIR feed tube bracket nut (2) from the throttle body stud.
  9. Disconnect the AIR feed tube quick connect fitting (3) from the AIR shutoff and check valve. Refer to Plastic Collar Quick Connect Fitting Service.
  10. Remove the AIR feed tube from the throttle body stud and reposition.

    11. Object Number: 1755979 Size: SH
  11. Remove the AIR shutoff and check valve to bracket upper bolts (1).
  12. Remove the AIR shutoff and check valve (1).
  13. Remove and discard the AIR shutoff an check valve to exhaust manifold gasket.
  14. Clean the AIR to exhaust manifold gasket sealing surfaces.

Installation Procedure

    Object Number: 1755979 Size: SH
  1. Install a NEW AIR shutoff an check valve gasket to the exhaust manifold studs.
  2. Install the AIR shutoff and check valve (1).

    3. Notice: Refer to Fastener Notice in the Preface section.

  3. Install the AIR shutoff and check valve to bracket upper bolts (1).

    4. Tighten
    Tighten the bolts to 25 N·m (18 lb ft).


    Object Number: 1755972 Size: SH
  4. Position and install the AIR feed tube to the throttle body stud.
  5. Connect the AIR feed tube quick connect fitting (3) to the AIR shutoff and check valve. Refer to Plastic Collar Quick Connect Fitting Service.
  6. Install the AIR feed tube bracket nut (2) to the throttle body stud.

    7. Tighten
    Tighten the nut to 10 N·m (89 lb in).


    Object Number: 1755977 Size: SH
  7. Raise the vehicle.
  8. Install the AIR shutoff and check valve pipe to exhaust manifold nuts (3).

    9. Tighten
    Tighten the nuts to 10 N·m (89 lb in).

  9. Install the intake manifold cover bracket (1) and bolts (2).

    10. Tighten
    Tighten the bolts to 30 N·m (22 lb ft).

  10. Lower the vehicle.
  11. Connect the engine harness electrical connector to the AIR shutoff and check valve.
  12. Position and connect the brake booster vacuum hose to the intake manifold.
  13. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .