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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN CARGO EXTENDED, 5.7 R, L31/KL8REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 11 (ENGINE MECHANICAL - 4.3L UNIT REPAIR)REPAIR INSTRUCTIONSINTAKE MANIFOLD CLEANING & INSPECTION

2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8

Intake Manifold Cleaning & Inspection

2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8SECTION Intake Manifold Cleaning & Inspection

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

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: Inspecting Upper Intake Manifold
  Courtesy of GENERAL MOTORS CORP.
Inspect the lower intake manifold for the following:
- Damage to the gasket sealing surfaces (1), (2) and (3)
- Restricted exhaust gas recirculation (EGR) system passages (4)
- Restricted cooling system passages (5)
- Cracks or damage
- Damage to the threaded bolt holes
  
  Fig 4: Inspecting Lower Intake Manifold
  Courtesy of GENERAL MOTORS CORP.