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Crankcase Ventilation System Inspection/Diagnosis

WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Blowing Air Into Cylinder Head
    GM607625Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fuel Vapors in Evaporative Emission (EVAP) Components Caution in Cautions and Notices.
  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 In 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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