Hyundai Elantra: Positive Crankcase Ventilation (PCV) Valve. Description and Operation - Crankcase Emission Control System - Emission Control System - Hyundai Elantra HD 2006Ц2010 Service ManualHyundai Elantra: Positive Crankcase Ventilation (PCV) Valve. Description and Operation

Operation

Engine condition
Not running
Engine condition
Idling or decelerating
PCV valve
Not operating
PCV valve
Fully operating
Vacuum passage
Restricted
Vacuum passage
Small

Engine condition
Normal operation
Engine condition
Accelerating and high load
PCV valve
Properly operating
PCV valve
Slightly operating
Vacuum passage
Large
Vacuum passage
Very large