What are the impacts of a faulty engine exhaust valve?
3 Answers
Damaged exhaust valve impacts are as follows: 1. Unable to control exhaust gas recirculation volume: After the exhaust valve is damaged, it will be unable to control the exhaust gas recirculation volume. Excessive exhaust gas participating in recirculation will affect the mixture concentration, and the car may experience difficulties in starting, engine shaking, unstable idling, weak acceleration, etc., affecting engine performance; 2. Loss of oil-gas separation function: After the exhaust valve is damaged, it may cause the car to burn engine oil, with blue smoke coming from the exhaust pipe. The exhaust valve serves the function of oil-gas separation. When working normally, it only sucks exhaust gas and not oil. When the exhaust valve is damaged, it will lose the oil-gas separation function, and may suck in oil while inhaling, allowing oil to enter the combustion chamber, resulting in the burning of engine oil and the emission of blue smoke.
A faulty PCV valve can cause significant issues. I've repaired many vehicles where a failed valve led to imbalanced crankcase pressure, sucking engine oil into the intake manifold. This increases carbon buildup, causing engine idle vibration or even stalling. Prolonged neglect can burn out spark plugs and oxygen sensors, with blue exhaust smoke being a classic symptom. During repairs, always check for vacuum leaks in the hoses to prevent more severe damage. Regular PCV system maintenance is crucial - don't wait until problems escalate. While replacing the valve is inexpensive, ignoring it could halve engine lifespan, making repairs far costlier. No driver wants their vehicle running rough - it's simply not worth the trouble.
If the PCV valve fails, I find the most annoying part is the sudden spike in fuel consumption. Last month my car had this issue – engine noise increased noticeably, plus I smelled burnt oil. At idle, the car shook violently with sluggish acceleration. Repair might cost a few hundred bucks, but leaving it untreated could lead to oil leaks or corrosion of other components, doubling the repair bill. Long-term engine damage is a serious concern – watch for dashboard warning lights. A quick oil condition check before each drive prevents major issues. It also harms the environment with dirtier exhaust emissions. Replacing the valve early saves money and hassle.
