What is the primary function of a PCV (Positive Crankcase Ventilation) valve?

The primary function of a PCV (Positive Crankcase Ventilation) valve is to reduce harmful emissions by recirculating crankcase gases back into the intake manifold. The PCV system plays a crucial role in engine performance and environmental protection by directing unburned fuel vapors and combustion byproducts that accumulate in the crankcase back into the intake system. This process helps to combust those vapors in the engine rather than allowing them to escape into the atmosphere, which would increase air pollution.

By maintaining proper pressure within the crankcase and promoting better combustion of those gases, the PCV valve aids in maintaining engine efficiency and reduces potential wear on engine components due to the buildup of contaminants. This is particularly important for meeting emissions regulations and improving overall air quality.