The positive crankcase ventilation, or PCV, system was one of the earliest emission-control devices used in vehicles. 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
Test PCV system ----
Engine on, remove the oil filler cap or oil dipstick. If the idle changes, it's probably ok. If it doesn't, the PCV is likely torn or stuck open and needs replacing.
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