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Exhaust Manifold Cleaning and Inspection

WARNING: This page is about a different car, the 2003 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
  1. Clean the exhaust manifold mating surfaces.
  2. Clean the exhaust manifold.
  3. Inspect the exhaust manifold mating surfaces for damage.
    Fig 1: Identifying Exhaust Manifolds
    G01969439Courtesy of GENERAL MOTORS CORP.
  4. Inspect the exhaust manifold flange for straightness, using a straight edge and a feeler gage.
  5. If the exhaust manifold flange is warped more than 0.05 mm (0.002 in) replace the exhaust manifold.
    Fig 2: Measuring Exhaust Manifold Flange With Straight Edge & Feeler Gage
    G01969440Courtesy of GENERAL MOTORS CORP.
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