Inspection Procedure

WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

Inspect the throttle body bolt inserts for looseness or damaged threads.

Fig 1: Inspecting Throttle Body Bolt Inserts
Courtesy of GENERAL MOTORS CORP.
Inspect the fuel rail bolt inserts for looseness or damaged threads.

Fig 2: Inspecting Fuel Rail Bolt Inserts
Courtesy of GENERAL MOTORS CORP.
Inspect the intake manifold vacuum passages for debris or restrictions.
Important: The rear manifold absolute pressure (MAP) sensor housing is retained to the intake manifold by push-in-place snap lock design.

The rear MAP sensor housing is sealed at the intake manifold by an O-ring seal.
Inspect the rear MAP sensor housing.
- Inspect for damaged or broken vacuum fittings, damaged MAP sensor mounting bore, or broken MAP sensor retaining tab.
- Inspect the rear MAP sensor housing for looseness or poor sealing to the intake manifold. Repair or replace the components as necessary.
  
  Fig 3: Inspecting Rear MAP Sensor Housing
  Courtesy of GENERAL MOTORS CORP.
Inspect the composite intake manifold assembly for cracks or damage.
Inspect the areas between the intake runners.
Inspect all the gasket sealing surfaces and grooves for cracking or damage.
Inspect the fuel injector bores for excessive scoring or damage.

Fig 4: Inspecting Fuel Injector Bores
Courtesy of GENERAL MOTORS CORP.
Inspect the intake manifold cylinder head deck for warpage.
1. 8.1. Locate a straight edge across the intake manifold cylinder head deck surface.
2. 8.2. Insert a feeler gauge between the intake manifold and the straight edge.
  A intake manifold with warpage in excess of 0.5 mm (0.02 in), must be replaced.
Upon completion of inspection, install the MAP sensor to the manifold.