Positive Crankcase Ventilation (PCV) System
WARNING: This page is about a different car, the 2006 Mercury Milan, 2006 Lincoln Zephyr, and 2006 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
The PCV system:
- Uses intake manifold vacuum to ventilate blow-by fumes from the crankcase.
- Returns the fumes to the intake manifold for combustion.
The PCV valve:
- Varies the amount of blow-by gases returned to the intake manifold based on available engine vacuum.
- Prevents combustion gases backfiring into the crankcase.
The PCV system consists of the:
- Fresh air tube.
- Cam cover fitting.
- Crankcase ventilation tube.
- Positive crankcase ventilation valve.
The PCV heater element:
- Heats the ventilating air and blow-by gases going to the intake manifold.