Intake Manifold Cleaning and Inspection

WARNING: This page is about a different car, the 2004 GMC Sierra and 2004 Chevrolet Silverado. 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 upper intake manifold in cleaning solvent.
Dry the upper intake manifold with compressed air.

Fig 1: Upper Intake Manifold

Courtesy of GENERAL MOTORS CORP.

Clean the lower intake manifold in cleaning solvent.
Dry the lower intake manifold with compressed air.

Fig 2: Lower Intake Manifold

Courtesy of GENERAL MOTORS CORP.

Inspect the upper intake manifold for the following:
- Cracks or other damage to the exterior (1)
- Cracking or damage in the gasket grooves (2) and (3)
- Damage to the throttle body mounting surface (4)
- Loose or damaged bolt hole thread inserts (5)

Fig 3: Upper Intake Manifold Damage

Courtesy of GENERAL MOTORS CORP.

Inspect the lower intake manifold for the following:
- Damage to the gasket sealing surfaces (1) and (2)
- Restricted cooling system passages (3)
- Cracks or damage
- Damage to the threaded bolt holes

Fig 4: Lower Intake Manifold Damage

Courtesy of GENERAL MOTORS CORP.