Positive Crankcase Ventilation (PCV) system Ford F150
Note: The PCV valve on all models is located on the right-side valve cover.
1. The Positive Crankcase Ventilation (PCV) system reduces hydrocarbon emissions by scavenging crankcase vapors. It does this by circulating fresh air from the air cleaner through the crankcase, where it mixes with blow-by gases and is then rerouted through a PCV valve to the intake manifold.
Locating the PCV valve (2.7L model shown)
2. The PCV valve is located on the valve cover
3. To maintain idle quality, the PCV valve restricts the flow when the intake manifold vacuum is high. If abnormal operating conditions (such as piston ring problems) arise, the system is designed to allow excessive amounts of blow-by gases to flow back through the crankcase vent tube into the air cleaner to be consumed by normal combustion.
4. Checking and replacement of the PCV valve is covered in Tune-up and routine maintenance.