PCV System

The PCV system uses intake manifold vacuum to ventilate blow-by vapors from the crankcase and return the vapors to the intake manifold for combustion. The PCV valve varies the amount of blow-by vapors returned to the intake manifold based on available engine vacuum.

The PCV valve on the 4.6L (3V) engine is integral to the LH valve cover. If a new PCV valve is required, a new valve cover must be installed. Refer to ENGINE - 4.6L (3V) .