Inspection Procedure

WARNING: This page is about a different variant/trim than selected.

Fig 1: Inspecting Intake Manifold For Damage To Fuel Rail Mounting Inserts & Studs

Courtesy of GENERAL MOTORS CORP.

Inspect the intake manifold for the following conditions:
- Damage to the fuel rail mounting inserts (1)
- Damage to the studs (2)

Fig 2: Inspecting Intake Manifold For Cracks & Damage To Bolt Bosses

Courtesy of GENERAL MOTORS CORP.

Inspect the intake manifold for the following conditions:
- Damage to the intake manifold bolt bosses (1)
- Damage or cracks to the composite intake manifold assembly (2)
- Damage in areas between the intake runners (3)

Fig 3: Inspecting Intake Manifold For Damage To Sealing Surfaces & Fuel Injector Bores

Courtesy of GENERAL MOTORS CORP.

Inspect the intake manifold for the following conditions:
- Damage, gouges or cracks to the intake manifold sealing surfaces and grooves (1)
- Damage or excessive scoring to the fuel injector bores (2)

Fig 4: Inspecting Front Intake Manifold For Damage To Passage & Plenum Duct Neck

Courtesy of GENERAL MOTORS CORP.

Inspect the front of the intake manifold for the following conditions:
- Damage, debris or restrictions to the intake manifold passage (1)
- Damage to the plenum duct neck (2)

Fig 5: Inspecting Intake Manifold For Damage To PCV System Hose & Vacuum Ports

Courtesy of GENERAL MOTORS CORP.

Inspect the intake manifold for the following conditions:
- Damage, debris or restrictions to the PCV system hose port (1)
- Damage, debris or restrictions to the vacuum port (2)
Inspect the intake manifold cylinder head deck for warpage.
1. Locate a straight edge across the intake manifold cylinder head deck surface.
2. Insert a feeler gage between the intake manifold and the straight edge. An intake manifold with warpage in excess of 0.25 mm per 25 mm (0.010 in per 1.00 in) must be replaced.
Repair or replace the intake manifold as necessary.