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Exhaust Manifold Cleaning and Inspection

WARNING: This page is about a different car, the 2004 GMC Sierra and 2004 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    CAUTION: Refer to Safety Glasses Caution in Cautions and Notices.
  1. Clean the exhaust manifolds in cleaning solvent.
  2. Dry the components with compressed air.
  3. Inspect the exhaust manifolds for the following:
    • 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
    4. Fig 1: Exhaust Manifold Inspection Areas
    GM859872Courtesy of GENERAL MOTORS CORP.
  4. Measure the alignment or surface flatness of the exhaust manifold flanges using a straight edge and a feeler gage. Refer to Engine Mechanical Specifications .

    If the surface flatness is not within the specifications, the exhaust manifold is warped and must be replaced.

    5. Fig 2: Measuring Exhaust Manifold Flanges Alignment
    GM334528Courtesy of GENERAL MOTORS CORP.
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