Positive Crankcase Ventilation System

Overview

Figure 123: PCV System:

The Positive Crankcase Ventilation (PCV) System (Figure 123)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

Figure 124: PCV Internal Drawing:

Figure 125: Typical PCV Vacuum Connector: