Inspection Procedure

WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: View Of Throttle Body & Nuts

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Inspect the throttle body studs and threaded inserts for looseness or damaged threads.
Inspect the wire harness stud and threaded insert for looseness or damaged threads.

Fig 2: View Of Fuel Rail W/Injectors

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Inspect the fuel rail bolt inserts for looseness or damaged threads.
Inspect the intake manifold vacuum passages for debris or restrictions.

Fig 3: View Of MAP Sensor

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Inspect for damaged or broken vacuum fittings, damaged MAP sensor (714) mounting bore, or broken MAP sensor retaining tabs.
Inspect the composite intake manifold assembly for cracks or other damage.
Inspect the areas between the intake runners.
Inspect all the gasket sealing surfaces for damage.

Fig 4: Inspecting Intake Manifold Cylinder Head Deck For Warpage

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Inspect the fuel injector bores for excessive scoring or damage.
Inspect the intake manifold cylinder head deck for warpage.
1. Locate a straight edge across the intake manifold cylinder head deck surface.
  Position the straight edge across a minimum of 2 runner port openings.
2. Insert a feeler gage between the intake manifold and the straight edge.
  A 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.

Fig 5: View Of MAP Sensor

Courtesy of GENERAL MOTORS CORP.

Install the MAP sensor (714).

NOTE: Refer to Fastener Notice .

Install the EVAP canister purge solenoid valve, bolt, and isolator.
Tighten: Tighten the EVAP valve bolt to 10 N.m (89 lb in).