GM Service Manual Online
For 1990-2009 cars only

Important: 

   • Do not reuse the exhaust manifold-to-cylinder head gaskets. Upon installation of the exhaust manifold, install a NEW gasket. An improperly installed gasket or leaking exhaust system may effect On-Board Diagnostics (OBD) II system performance.
   • Inspect the exhaust manifold for cracks near the mounting holes (1-5).


    Object Number: 234429  Size: SH
  1. Clean the exhaust manifold with solvent.
  2. Caution: Refer to Safety Glasses Caution in the Preface section.

  3. Dry the exhaust manifold with compressed air.

  4. Object Number: 235498  Size: SH
  5. Clean the exhaust manifold mating surface.
  6. Use a straight edge and a feeler gage and measure the exhaust manifold mounting face for warpage. Refer to Engine Mechanical Specifications .
  7. If the warpage is greater than the maximum, replace the exhaust manifold.