GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 HUMMER 🢒 2007 🢒 H3 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Secondary Air Injection Check Valve Replacement

Removal Procedure

    Object Number: 1749355 Size: SH
  1. Open the hood.
  2. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
  3. Disconnect the secondary air injection (AIR) pump outlet hose quick connect fitting from the AIR check valve. Refer to Plastic Collar Quick Connect Fitting Service .

    4. Object Number: 1749361 Size: SH
  4. Disconnect the engine wiring harness electrical connector (1) from the AIR check valve.

    5. Object Number: 1749363 Size: SH
  5. Remove the AIR check valve studs (3).
  6. Remove the AIR check valve (2) and gasket (1). Discard the gasket.

Installation Procedure

    Object Number: 1749363 Size: SH
  1. Place a NEW AIR check valve gasket (1) between the engine and the valve.
  2. Position the AIR check valve (2) to the engine.

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

  3. Install the AIR check valve studs (3).

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


    Object Number: 1749361 Size: SH
  4. Connect the engine wiring harness electrical connector (1) to the AIR check valve.

    5. Object Number: 1749355 Size: SH
  5. Connect the AIR pump outlet hose quick connect fitting to the AIR check valve. Refer to Plastic Collar Quick Connect Fitting Service .
  6. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
  7. Close the hood.