Ranger 2WD V6-177 2.9L (1989)
Positive Crankcase Ventilation: Description and Operation
Typical PCV System
The Positive Crankcase Ventilation system cycles crankcase gases back through the engine where they are burned. In a typical system, 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. On some engine
applications, the PCV system is connected with the evaporative emission system.