Exhaust Manifold Cleaning and Inspection

WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. 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.

Clean the exhaust manifolds in cleaning solvent.
Dry the components with compressed air.
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
  
  Fig 1: Inspecting Exhaust Manifolds
  Courtesy of GENERAL MOTORS CORP.
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.

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