GM Service Manual Online
For 1990-2009 cars only

    Object Number: 1877290  Size: SH
  1. Remove the exhaust manifold heat shield.

  2. Object Number: 825111  Size: SH
  3. Remove the block heater if equipped.

  4. Object Number: 1877291  Size: SH
  5. Remove the oxygen sensor.

  6. Object Number: 1179623  Size: SH
  7. Remove and discard the exhaust manifold to cylinder head retaining nuts.
  8. Remove the exhaust manifold and catalytic converter assembly.
  9. Clean all of the sealing surfaces.
  10. If the exhaust manifold and catalytic converter assembly is being replaced, transfer the following parts:
  11. • The exhaust manifold heat shield
    • The oxygen sensor