GM Service Manual Online
For 1990-2009 cars only

    Warning: Refer to Safety Glasses Warning in the Preface section.


    Object Number: 859872  Size: SH
  1. Clean the exhaust manifolds in cleaning solvent.
  2. Dry the components with compressed air.
  3. Inspect the exhaust manifolds for the following:
  4. • Damage to the gasket sealing surfaces (1)
    • Damage to the threaded holes (2)
    • Restrictions within exhaust passages
    • Broken or damaged exhaust manifold heat shields (3), if applicable
    • Broken or damaged exhaust manifold

    Object Number: 334528  Size: SH
  5. Measure the alignment or surface flatness of the exhaust manifold flanges using a straight edge and a feeler gage. Refer to Engine Mechanical Specifications.
  6. If the surface flatness is not within the specifications, the exhaust manifold is warped and must be replaced.