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Home › Pontiac › 2008 › G8 Base › Repair and Diagnosis › Engine Mechanical › Engine Exhaust System › Repair Instructions › Exhaust Crossover Pipe Replacement › Removal Procedure

Removal Procedure

  1. Disconnect the battery ground cable from the battery. Refer to Battery Negative Cable Disconnection and Connection .
    2. CAUTION: Refer to Exhaust Service Caution .
    CAUTION: Refer to Protective Goggles and Glove Caution .
    CAUTION: Refer to Vehicle Lifting Caution .
  2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  3. Support the exhaust system using a suitable jack.
  4. Remove the rear exhaust muffler assemblies. Refer to Exhaust Muffler Replacement - Left Side  and Exhaust Muffler Replacement - Right Side .
    5. Fig 1: Identifying Left Post-Catalytic Converter Heated Oxygen Sensor (HO2S) Electrical Connector
    GM1949882Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice .
  5. Disconnect the left post-catalytic converter heated oxygen sensor (HO2S) electrical connector (1).
    6. Fig 2: Identifying Right Post-Catalytic Converter HO2S Electrical Connector
    GM1949877Courtesy of GENERAL MOTORS CORP.
  6. Disconnect the right post-catalytic converter HO2S electrical connector (1).
    7. Fig 3: Identifying Intermediate Exhaust Assembly To Left Catalytic Converter Retaining Nuts
    GM1947042Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: The intermediate exhaust assembly to left catalytic converter retaining nuts (3) are single use parts. They must be discarded after removal.
  7. Remove the intermediate exhaust assembly to left catalytic converter retaining nuts (3).

    Discard the nuts.

  8. Disconnect the intermediate exhaust assembly (2) from the left catalytic converter (1).
    9. Fig 4: Identifying Intermediate Exhaust Assembly To Right Catalytic Converter Retaining Nuts
    GM1947044Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: The intermediate exhaust assembly to right catalytic converter retaining nuts (3) are single use parts. They must be discarded after removal.
  9. Remove the intermediate exhaust assembly to right catalytic converter retaining nuts (3).

    Discard the nuts.

  10. Disconnect the intermediate exhaust assembly (2) from the right catalytic converter (1).
    11. Fig 5: Identifying Intermediate Exhaust Assembly To Rear Muffler Retaining Bolts
    GM1947045Courtesy of GENERAL MOTORS CORP.
  11. Remove the intermediate exhaust assembly to rear muffler retaining bolts (3).
    12. Fig 6: Identifying Center Insulator Hanger Bracket To Differential Retaining Bolt
    GM1947047Courtesy of GENERAL MOTORS CORP.
  12. Detach the intermediate exhaust assembly (2) by removing the center insulator hanger bracket to differential retaining bolt (1).
  13. Carefully lower the intermediate exhaust assembly from the vehicle.
  14. Remove the left post-catalytic converter HO2S. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 or Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 .
  15. Remove the right post-catalytic converter HO2S. Refer to Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 or Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 .
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