If it rattles, it means the pintle inside is not stuck and the valve should flow air. *P0174 Diagnosing Positive Crankcase Ventilation System Positive Crankcase Ventilation system improves vehicle performance and routine maintenance such as regular oil change can extend the life of the system, but eventually it will have to be replaced.Īgain, a neglected or poorly operating PCV system will quickly contaminate the engine oil and heavy sludge accumulations from the combustion process blow-by. Taking care of Positive Crankcase Ventilation System Failed Positive Crankcase Ventilation heater.A loose or leaky hose which drives unmetered air into the engine.
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