![]() A PCV valve that’s supposed to regulate the flow of these gases is the heart of most PCV systems (some newer vehicles don’t have a PCV valve). The PCV system is seldom listed as a maintenance item, but an old valve that is no longer functioning like it should can cause performance and emissions problems. When does the PCV valve need to be replaced? Let’s take a closer look. Most positive crankcase ventilation systems have a valve known as the PCV valve. The PCV system draws leftover combustion gases from the crankcase (the oil pan and bottom of the engine) and routes them back into the engine via the intake manifold, where they’re burned in the combustion chambers instead of escaping into the atmosphere via your exhaust system. ![]() CARS.COM - The positive crankcase ventilation, or PCV, system was one of the earliest emission-control devices used in vehicles. ![]()
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