GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2005 🢒 Vibe - FWD 🢒 Vehicle Control Systems 🢒 Vehicle DTC Information 🢒 Crankcase Ventilation System Inspection/Diagnosis
  1. Remove the positive crankcase ventilation (PCV) valve. Refer to Positive Crankcase Ventilation Valve Replacement.

    2. Object Number: 607625 Size: SH

    Caution: Do not breathe the air through the EVAP component tubes or hoses. The fuel vapors inside the EVAP components may cause personal injury.

  2. Blow air into the cylinder head side of the PCV valve.
  3. Check that air passes through the PCV valve easily.

    4. Object Number: 607623 Size: SH
  4. Blow air into the intake manifold side of the PCV valve.
  5. Check that air passes through the PCV valve with high resistances.
  6. If the PCV valve fails either test, replace the PCV valve. Refer to Positive Crankcase Ventilation Valve Replacement.
  7. Inspect the PCV hose for damage, restrictions, or leaks. Replace the hose as necessary.
  8. Inspect all PCV system passages and connections for leaks or restrictions. Repair as necessary.