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HOMESERVICE MANUALSPONTIAC2008GRAND PRIX BASEREPAIR AND DIAGNOSISENGINE MECHANICALENGINE EXHAUST SYSTEMREPAIR INSTRUCTIONSCATALYTIC CONVERTER REPLACEMENT (LS4)REMOVAL PROCEDURE
2008 Pontiac Grand Prix Base

Removal Procedure

2008 Pontiac Grand Prix BaseSECTION Removal Procedure
IMPORTANT: The catalytic converter is serviced by replacing the entire assembly. Always replace the gaskets at the front and rear flanges when servicing the catalytic converter. Never install the original gaskets.
    Fig 1: Bank 2 Sensor 2 Electrical Harness Connector
    GM1553099Courtesy of GENERAL MOTORS CORP.
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Disconnect the heated oxygen sensor (HO2S) electrical connector.
    3. Fig 2: Exhaust Manifold Pipe & Gasket
    GM1553053Courtesy of GENERAL MOTORS CORP.
  3. Remove the catalytic converter pipe stud nuts (2).
    4. Fig 3: Exploded View Of Catalytic Converter & Muffler Components
    GM1553050Courtesy of GENERAL MOTORS CORP.
  4. Remove the catalytic converter nuts (3).
  5. Using a suitable adjustable jack, loosely support the exhaust system.
    6. Fig 4: Catalytic Converter Hangers
    GM1553064Courtesy of GENERAL MOTORS CORP.
  6. Remove the catalytic converter hangers (1) from the converter.
  7. Remove the catalytic converter.
  8. Remove and discard the catalytic converter gaskets.
    9. Fig 5: Identifying HO2S
    GM1553063Courtesy of GENERAL MOTORS CORP.
  9. Remove the HO2S, if required.
  10. Clean and inspect the exhaust manifold and the exhaust pipe mating surfaces.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.