GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Oldsmobile 🢒 2003 🢒 Aurora 🢒 Engine 🢒 Engine Mechanical - 4.0L 🢒 Exhaust Manifold Removal - Right Side

Exhaust Manifold Removal - Right Side W/O RPO, NC1 or NF7


    Object Number: 331281 Size: SH
  1. Remove the oxygen sensor (1) and inspect the sensor for excessive deposits or damage. Replace the oxygen sensor if necessary.

    2. Object Number: 315065 Size: SH

    Notice: The stud must be reinstalled in the original location. The stud may remain attached to the nut when initially removed during exhaust manifold removal. In order to prevent exhaust leakage between the exhaust manifold and cylinder head the nut and stud combination must be reinstalled during exhaust manifold installation in the original location.

  2. Remove the right exhaust manifold retaining nuts (3).

    3. Important: DO NOT reuse the exhaust manifold gasket.

  3. Remove the exhaust manifold and the gasket (1).

    4. Object Number: 350278 Size: SH
  4. If equipped, remove the right coolant heater (1) as follows:
    5. 4.1. Remove the coolant heater retaining bolt.
    4.2. Remove coolant heater from the cylinder block.

Exhaust Manifold Removal - Right Side W/RPO, NC1 or NF7


    Object Number: 522461 Size: SH
  1. Disconnect the vacuum harness from the A.I.R. valve and vacuum solenoid valve.

    2. Object Number: 522436 Size: SH
  2. Disconnect the vacuum harness from the water crossover vacuum port.
  3. Remove the A.I.R. vacuum harness.

    4. Object Number: 522468 Size: SH
  4. Remove the A.I.R. valve pipe nuts from the exhaust manifold.
  5. Remove the A.I.R. valve bolts from the mounting bracket.
  6. Remove the A.I.R. valve.

    7. Important: DO NOT reuse the A.I.R. valve pipe gasket.

  7. Remove and discard the A.I.R. valve pipe gasket.

    8. Object Number: 331281 Size: SH
  8. Remove the oxygen sensor (1) and inspect the sensor for excessive deposits or damage. Replace the oxygen sensor if necessary.

    9. Object Number: 871672 Size: SH

    Notice: The stud must be reinstalled in the original location. The stud may remain attached to the nut when initially removed during exhaust manifold removal. In order to prevent exhaust leakage between the exhaust manifold and cylinder head the nut and stud combination must be reinstalled during exhaust manifold installation in the original location.

  9. Remove the right exhaust manifold retaining nuts (3).

    10. Important: DO NOT reuse the exhaust manifold gasket.

  10. Remove the exhaust manifold and the gasket (1).

    11. Object Number: 350278 Size: SH
  11. If equipped, remove the right coolant heater (1) as follows:
    12. 11.1. Remove the coolant heater retaining bolt.
    11.2. Remove coolant heater from the cylinder block.