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Exhaust Manifold Cleaning and Inspection

WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
  1. Clean the exhaust manifold mating surfaces.
    2. Fig 1: Cleaning Exhaust Manifold
    GM1229790Courtesy of GENERAL MOTORS CORP.
  2. Clean the exhaust manifold.
  3. Inspect the exhaust manifold mating surfaces for damage.
  4. Inspect the exhaust manifold flange for straightness, using a straight edge and a feeler gauge.
    5. Fig 2: Using Feeler Gauge To Inspect Exhaust Manifold Flange
    GM187027Courtesy of GENERAL MOTORS CORP.
  5. If the exhaust manifold flange is warped more than 0.05 mm (0.002 in) replace the exhaust manifold.
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