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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1021 (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 car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
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. 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 solenoid sealing surface (4) for damage. The purge solenoid 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
    4. Fig 1: Intake Manifold Inspection Areas
    GM635688Courtesy of GENERAL MOTORS CORP.
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