Excursion 4WD V10-6.8L (2002)
Positive Crankcase Ventilation: Description and Operation
Overview
PCV System
The Positive Crankcase Ventilation (PCV) System (Figure 130) cycles crankcase gases back through the engine where they are burned. The PCV
valve regulates the amount of ventilating air and blow-by gas to the intake manifold and prevents backfire from traveling into the crankcase. The PCV
valve should be mounted in a vertical position. On some applications, the PCV system is connected to the evaporative emission system (refer to the
VECI decal).
CAUTION: Do not remove the PCV system from the engine. Removal of the PCV system will adversely affect the fuel economy and engine
ventilation and result in shorter engine life.
Hardware
PCV Internal Drawing
