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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 374 (Engine Exhaust System) >> Repair Instructions >> Exhaust Manifold Replacement - Right Side >> Removal Procedure

Removal Procedure

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    Fig 1: Exhaust Manifold, Gasket And Catalytic Converter
    GM1708617Courtesy of GENERAL MOTORS CORP.
  1. Remove the heated oxygen sensor (HO2S). Refer to Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (1500 Series) , Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (2500 Series) .
  2. Fully raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle .
  3. Remove the catalytic converter to exhaust manifold nuts. (1500 series shown, 2500 series similar).
  4. Remove the front wheel house liner - right side. Refer to Front Wheelhouse Liner Replacement - Right Side .
    5. Fig 2: Spark Plug Wires
    GM1962351Courtesy of GENERAL MOTORS CORP.
  5. Partially lower the vehicle in order to work through the wheel opening.
  6. Remove the spark plug wires (1) from the spark plugs.
    1. Twist the spark plug wire boot a 1/2 turn.
    2. Pull only on the boot in order to remove the wire from the spark plug.
  7. Remove the spark plug wires from the ignition coils.
    1. Twist the spark plug wire boot a 1/2 turn.
    2. Pull only on the boot in order to remove the wire from the ignition coil.
  8. Remove the oil level indicator tube from the engine block. Refer to Oil Level Indicator Tube Replacement .
    9. Fig 3: Exhaust Manifold, Gasket And Bolts
    GM1708618Courtesy of GENERAL MOTORS CORP.
  9. Remove the exhaust manifold bolts and exhaust manifold.
  10. Remove and discard the exhaust manifold gasket.
  11. Remove and discard the exhaust manifold seal.
    12. Fig 4: Exhaust Manifold Heat Shield And Bolts
    GM1708619Courtesy of GENERAL MOTORS CORP.
  12. If replacing the exhaust manifold, remove the exhaust manifold heat shield bolts, and shield from the exhaust manifold.
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