The positive crankcase ventilation valve (PCV) regulates the flow of flammable crankcase vapors back into the engine so they can be burned safely. The valve is designed to close in the event of an engine backfire to prevent catastrophic engine damage. As they age, the PCV valve accumulates carbon buildup and the spring loses tension, putting your engine at risk. Refer to your car’s maintenance guide for recommended replacement intervals. Most PCV valves can be replaced simply by wiggling the …
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