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Crankcase Ventilation System Inspection/Diagnosis

WARNING: This page is about a different variant/trim than selected.
NOTE: Refer to FUEL VAPORS IN EVAPORATIVE EMISSION (EVAP) COMPONENTS CAUTION .
  1. Blow air into the cylinder head side of the PCV valve.
    Fig 1: Blowing Air Into Cylinder Head Side Of PCV Valve
    G01546664Courtesy of GENERAL MOTORS CORP.
  2. Check that air passes through the PCV valve easily.
  3. Blow air into the intake manifold side of the PCV valve.
    Fig 2: Blowing Air Into Intake Manifold Side Of PCV Valve
    G01546665Courtesy of GENERAL MOTORS CORP.
  4. Check that air passes through the PCV valve with high resistances.
  5. If the PCV valve fails either test, replace the PC valve.
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