GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2004 🢒 Grand Prix 🢒 Engine 🢒 Engine Mechanical - 3.8L 🢒 Exhaust Manifold Cleaning and Inspection

    Object Number: 1229790 Size: SH
  1. Clean the exhaust manifold mating surfaces.
  2. Clean the exhaust manifold.
  3. Inspect the exhaust manifold mating surfaces for damage.

    4. Object Number: 187027 Size: SH
  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.