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Home >> GMC >> 2016 >> Terrain SL, Gas >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 18 (Engine Mechanical - 3.6L (LFX) - Repair Instructions - Off Vehicle) >> Repair Instructions - Off Vehicle >> Intake Manifold Cleaning and Inspection >> Inspection Procedure

Inspection Procedure

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    Fig 1: Inspecting Intake Manifold
    GM2202061Courtesy of GENERAL MOTORS COMPANY
  1. Inspect the intake manifold for the following conditions:
    • Damage to the throttle body bolt holes (1)
    • Damage, debris or restrictions to the PCV system hose ports (3)
    • Damage to the gasket sealing surface for the throttle body (2)
  2. Fig 2: Inspection Areas Of Intake Manifold
    GM2202062Courtesy of GENERAL MOTORS COMPANY
  3. Inspect the intake manifold for the following conditions:
    • Damage, debris or restrictions to the brake vacuum booster hose port (3)
    • Damage to the intake manifold bolt bosses (1)
    • Damage to the EVAP purge solenoid mounting boss (5)
    • Damage, debris or restrictions to the EVAP purge solenoid port (4)
    • Gouges or damage to the intake manifold sealing surfaces (2)
  4. Fig 3: Inspecting Intake Manifold Sealing Surface
    GM2202063Courtesy of GENERAL MOTORS COMPANY
  5. Inspect the intake manifold sealing surface (1) for warpage.
    1. Locate a straight edge across the intake manifold sealing surface.
    2. Insert a feeler gauge between the intake manifold and the straight edge. An intake manifold with warpage in excess of 0.50 mm (0.020 in) must be replaced.
  6. Repair or replace the intake manifold as necessary.