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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Mechanical - 8.1L) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Intake Manifold Cleaning and Inspection

Intake Manifold Cleaning and Inspection

WARNING: This page is about a different variant/trim than selected.
IMPORTANT: Do not use the intake manifold gaskets or end seals again.
  1. Clean the intake manifold in an approved solvent.
    • Clean debris out of all bolt holes. Clean the intake manifold gasket sealing surfaces.
    • Clean all intake manifold ports.
    2. Fig 1: Intake Manifold Inspection Areas
    GM635688Courtesy of GENERAL MOTORS CORP.
    CAUTION: Refer to Safety Glasses Caution in Cautions and Notices.
  2. Dry the intake manifold with compressed air.
  3. Inspect the following:
    • The intake manifold bolt holes (1) for cracks and/or damage
    • The manifold absolute pressure (MAP) sensor sealing surface (2) for damage
    • The evaporative emission (EVAP) purge valve sealing surface (4) for damage. The purge valve bolt has a sealer that may come off during removal of the bolt. Ensure all sealant is removed from the bolt hole.
    • The intake manifold-to-cylinder head sealing surfaces (3) for damage
    • The throttle body studs (5) for damage. Replace as necessary.
    • The throttle body mounting surface (6) for damage
    • The oil fill tube hole (7) for signs of leakage. Reseal as necessary.
    • Positive crankcase ventilation (PCV) port (8) for debris or varnish buildup
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