PCV System

Engine Emission Control - 5.4L (3V), 6.8L (3V)

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 law.

The gasoline engine emission control system consists of the:

- PCV system.


PCV System

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:

- is integral to the LH valve cover. The intake side is heated to prevent freezing on the 6.8L engine.


Evaporative Emission (EVAP) Control System Vacuum Routing

5.4L (3V), Midship Fuel Tank Equipped Vehicles









5.4L (3V), Aft-of-Axle Fuel Tank Equipped Vehicles









5.4L (3V), Auxiliary Fuel Tank Equipped Vehicles









6.8L (3V), Midship Fuel Tank Equipped Vehicles









6.8L (3V), Aft-of-Axle Fuel Tank Equipped Vehicles









6.8L (3V), Auxiliary Fuel Tank Equipped Vehicles