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Intake Manifold Cleaning and Inspection

CAUTION: Refer to SAFETY GLASSES CAUTION in Caution and Notices.
  1. Clean the upper intake manifold in cleaning solvent.
    Fig 1: Cleaning Upper Intake Manifold
    G01644004Courtesy of GENERAL MOTORS CORP.
  2. Dry the upper intake manifold with compressed air.
  3. Clean the lower intake manifold in cleaning solvent.
    Fig 2: Cleaning Lower Intake Manifold
    G01644005Courtesy of GENERAL MOTORS CORP.
  4. Dry the lower intake manifold with compressed air.
  5. 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
    G01644006Courtesy of GENERAL MOTORS CORP.
  6. 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: Inspecting Lower Intake Manifold
    G01644007Courtesy of GENERAL MOTORS CORP.
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