Positive Crankcase Ventilation: Inspection/Diagnosis
WARNING:
Do not breathe the air through the EVAP component tubes or hoses. The fuel vapors inside the EVAP components may cause personal injury.
- Blow air into the cylinder head side of the PCV valve.
- Check that air passes through the PCV valve easily.
- Blow air into the intake manifold side of the PCV valve.
- Check that air passes through the PCV valve with high resistances.
- If the PCV valve fails either test, replace the PCV valve.