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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 638 (Engine Mechanical - 4.0L (Unit Repair)) >> Repair Instructions >> Intake Manifold Cleaning and Inspection >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora and 2001 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. Inspect the intake manifold for the following conditions:
    • Damage to the fuel rail mounting inserts (1)
    • Damage to the studs (2)
    Fig 1: Checking Intake Manifold (1 Of 4)
    G01817067Courtesy of GENERAL MOTORS CORP.
  2. Inspect the intake manifold for the following conditions:
    • Damage to the intake manifold bolt bosses (1)
    • Damage or cracks to the composite intake manifold assembly (2)
    • Damage in areas between the intake runners (3)
    Fig 2: Checking Intake Manifold (2 Of 4)
    G01817068Courtesy of GENERAL MOTORS CORP.
  3. Inspect the intake manifold for the following conditions:
    • Damage to the pressure relief valve mounting bosses (1)
    • Damage, debris or restrictions to the pressure relief valve port (2)
    • Damage to the pressure relief valve components (3)
    Fig 3: Checking Intake Manifold (3 Of 4)
    G01817069Courtesy of GENERAL MOTORS CORP.
  4. Inspect the intake manifold for the following conditions:
    • Damage, gouges or cracks to the intake manifold sealing surfaces and grooves (1)
    • Damage or excessive scoring to the fuel injector bores (2)
    Fig 4: Checking Intake Manifold (4 Of 4)
    G01817070Courtesy of GENERAL MOTORS CORP.
  5. Inspect the front of the intake manifold for the following conditions:
    • Damage, debris or restrictions to the intake manifold passage (1)
    • Damage to the plenum duct neck (2)
    Fig 5: Checking Intake Manifold Front
    G01817071Courtesy of GENERAL MOTORS CORP.
  6. Inspect the intake manifold for the following conditions:
    • Damage, debris or restrictions to the PCV system hose port (1)
    • Damage, debris or restrictions to the vacuum port (2)
  7. Inspect the intake manifold cylinder head deck for warpage.
    1. 7.1. Locate a straight edge across the intake manifold cylinder head deck surface.
    2. 7.2. Insert a feeler gage between the intake manifold and the straight edge. An intake manifold with warpage in excess of 0.25 mm per 25 mm (0.010 in per 1.00 in) must be replaced.
  8. Repair or replace the intake manifold as necessary.
    Fig 6: Checking Intake Manifold Rear
    G01817072Courtesy of GENERAL MOTORS CORP.
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