Engine Emission Control: Overview: PCV
NOTE:
Do not permanently remove or render inoperative any part of the vehicle emission control system including related hardware. Failure to comply may violate applicable state and federal laws.
NOTE:
The vehicle emission vacuum routing diagrams are contained in the Description and Operation, refer to
EVAPORATIVE EMISSIONS
The engine emission control system consists of the PCV system.
The PCV system:
- uses intake manifold vacuum to ventilate blow-by vapors from the crankcase.
- returns the vapors to the intake manifold for combustion.
The PCV system consists of the:
- crankcase ventilation tube.
- PCV valve.
The crankcase ventilation tube:
- is connected to the PCV valve and the intake manifold fitting.
The PCV valve:
- varies the amount of blow-by vapors returned to the intake manifold based on available engine vacuum.
- serviced as part of the crankcase vent oil separator.