What are the symptoms of a faulty crankcase ventilation valve?

[EmiliaAnn]

The symptoms of a faulty crankcase ventilation valve are as follows: 1. Increased pressure in the crankcase leading to oil leakage from the seals. 2. Inability to expel exhaust gases from the crankcase, accelerating oil deterioration. 3. Premature introduction of crankcase pressure into the intake system, causing unstable engine idle. The reasons for crankcase ventilation are as follows: During engine operation, a portion of the combustible mixture and exhaust gases always escape past the piston rings into the crankcase. The condensation of escaped gasoline vapors in the crankcase will dilute the engine oil, degrading its performance. The exhaust gases contain water vapor and sulfur dioxide; water vapor condenses in the oil, forming foam and disrupting oil supply, a phenomenon particularly severe in winter.