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Home › Chevrolet › 2008 › Impala SS › Repair and Diagnosis › Engine Mechanical › Engine Exhaust System › Repair Instructions › Catalytic Converter Replacement (LS4) › Installation Procedure

Installation Procedure

NOTE: To prevent internal damage to the flexible coupling of the catalytic converter assembly, the converter must be supported. The vertical movement at the rear of the catalytic converter assembly must not exceed 6 degrees up or down.
    Fig 1: Identifying HO2S
    GM1553063Courtesy of GENERAL MOTORS CORP.
  1. Install the HO2S, if required.
    2. Fig 2: Identifying Catalytic Converter Hangers
    GM1553064Courtesy of GENERAL MOTORS CORP.
  2. Install NEW gaskets to the exhaust manifold and muffler studs.
  3. Position the catalytic converter into place.
  4. Install the catalytic converter hangers (1) to the converter.
    5. Fig 3: Identifying Exhaust Manifold Pipe & Gasket
    GM1553053Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice .
  5. Install the catalytic converter pipe stud nuts (2).

    Tighten:  Tighten the nuts to 35 N.m (26 lb ft).

    6. Fig 4: View Of Catalytic Converter & Muffler Components
    GM1553050Courtesy of GENERAL MOTORS CORP.
  6. Install the catalytic converter nuts (3).

    Tighten:  Tighten the nuts to 60 N.m (44 lb ft).

  7. Remove the exhaust system support.
    8. Fig 5: View Of Bank 2 Sensor 2 Electrical Harness Connector
    GM1553099Courtesy of GENERAL MOTORS CORP.
  8. Connect the HO2S electrical connector.
  9. Lower the vehicle.
  10. Run the vehicle and inspect the exhaust system for leaks and underbody contact.
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