Inspection Procedure
WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
- Inspect the manifold for the following conditions:
- Damaged gasket or sealing surfaces
- Loose threaded inserts or studs
- Debris or restrictions within the passages of the manifold
- Damaged or broken vacuum fittings
- Inspect the composite intake manifold assembly for cracks or other damage.
Inspect the intake manifold cylinder head deck for warpage.
- Locate a straight edge across the intake manifold cylinder head deck surface.
Position the straight edge across a minimum of two runner port openings.
- Insert a feeler gauge between the intake manifold and the straight edge.
An intake manifold with warpage in excess of 3 mm (0.118 in) over a 200 mm (7.87 in) area is warped and should be replaced.
- Locate a straight edge across the intake manifold cylinder head deck surface.