Positive Crankcase Ventilation (PCV)
- Disconnect PCV valve with hose. Start engine and let idle. Place a finger over end of PCV valve and check for vacuum. If vacuum is present, go to next step. If vacuum is not present, check for clogged valve. Replace if necessary.
- Turn engine off. Remove PCV valve from hose. Shake valve and listen for rattle. Replace PCV valve if no rattle is heard.