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Home › Cadillac › 2011 › DTS 4.6 6 › Repair and Diagnosis › Engine Performance › Engine Control Systems › Engine Controls And Fuel - 4.6L - Repair Instructions › Repair Instructions › Secondary Air Injection Check Valve Replacement › Removal Procedure

Removal Procedure

    Fig 1: Identifying Engine Harness Electrical Connectors
    GM1665457Courtesy of GENERAL MOTORS COMPANY
  1. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement .
  2. Disconnect the engine harness electrical connector (4) from the secondary air injection (AIR) check valve.
    3. Fig 2: View Of AIR Pipe Outlet Pipe
    GM1665399Courtesy of GENERAL MOTORS COMPANY
  3. Pinch the constant tension clamp (1) and remove the AIR pipe from the AIR check valve.
    4. Fig 3: Identifying AIR Check Valve
    GM1670476Courtesy of GENERAL MOTORS COMPANY
  4. Remove the AIR check valve to exhaust manifold nuts (3).
  5. Remove the AIR check valve bolts (1).
  6. Remove the AIR check valve.
  7. Remove and discard the AIR check valve to exhaust manifold gasket (4).
  8. Clean the AIR to exhaust manifold gasket sealing surfaces.
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