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Crankcase Ventilation System Inspection/Diagnosis

WARNING: This page is about a different variant/trim than selected.
    Fig 1: Blowing Air Into Cylinder Head
    GM607625Courtesy of GENERAL MOTORS CORP.
    NOTE: Do not breathe the air through the EVAP component tubes or hoses. The fuel vapors inside the EVAP components may cause personal injury.
  1. Blow air into the cylinder head side of the PCV valve.
  2. Check that air passes through the PCV valve easily.
    3. Fig 2: Blowing Air Into Intake Manifold
    GM607623Courtesy of GENERAL MOTORS CORP.
  3. Blow air into the intake manifold side of the PCV valve.
  4. Check that air passes through the PCV valve with high resistances.
  5. If the PCV valve fails either test, replace the PCV valve.
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