Emission control system that redirects crankcase vapors back into the engine to be burned. Stand for Positive Crankcase Ventilation. Often controlled by a PCV valve that requires periodic replacement.

PCV valve problems can cause a car to run rough, stall, use excess engine oil, smoke, and have high exhaust emissions. The PCV valve should be replaced during an engine tuneup.

Many of today’s newer vehicles do not use an actual valve. A small restrictive orifice hole is used instead of the PCV valve to accomplish the same function.

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