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Home › Hummer › 2004 › H2 4D Utility Pickup › Repair and Diagnosis › Engine Mechanical › Engine Exhaust System › Repair Instructions › Exhaust Manifold Pipe Replacement › Removal Procedure

Removal Procedure

  1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Remove the engine protection shield. Refer to Engine Protection Shield Replacement in Frame and Underbody.
    3. Fig 1: View Of O2 Sensor, Connector, Harness And Retainers
    GM664781Courtesy of GENERAL MOTORS CORP.
  3. Remove the exhaust muffler. Refer to Muffler Replacement .
  4. Remove the clip around the engine harness and the oxygen sensor pigtail.
  5. Disconnect the connector position assurance (CPA) retainer.
  6. Disconnect the oxygen sensor electrical connector.
  7. If replacing the exhaust manifold pipe, remove the oxygen sensor.
    8. Fig 2: Exhaust Manifold Pipe Nuts (Right)
    GM664826Courtesy of GENERAL MOTORS CORP.
  8. Remove the exhaust manifold pipe nuts.
    9. Fig 3: Exhaust Manifold Pipe
    GM863015Courtesy of GENERAL MOTORS CORP.
  9. Remove the exhaust manifold pipe.
  10. Slide the exhaust manifold pipe hanger out of the exhaust pipe hanger bracket.
  11. Discard the exhaust manifold pipe seal.
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