What are the symptoms of a damaged car exhaust valve?
2 Answers
Exhaust valve damage can cause the engine to shake or even stall during idle. The specific effects are as follows: Effects of exhaust valve damage: It will be unable to control the amount of exhaust gas recirculation. Excessive exhaust gas participating in recirculation will affect the mixture concentration, potentially leading to difficulties in starting, engine shaking, unstable idle, weak acceleration, and other phenomena that impact engine performance. Function of the exhaust valve: The exhaust valve serves to separate oil and gas. When functioning properly, it only draws in exhaust gas and not oil. If the exhaust valve is damaged, it loses its oil-gas separation capability, potentially sucking in oil along with air. This can cause oil to enter the combustion chamber, resulting in oil burning and blue smoke emission.
If the PCV valve is faulty, the engine will noticeably shake at idle, making the entire car feel like it's wobbling, and the ride won't be smooth. Oil consumption will increase—you might notice the dipstick level dropping faster, and blue smoke coming from the exhaust pipe, appearing bluish or blue-gray, especially noticeable during acceleration. Power performance will also decline; even flooring the throttle will make acceleration sluggish, and climbing hills will become more difficult. Sometimes, you may hear hissing or ticking noises from the engine bay, and the check engine light on the dashboard will illuminate, signaling an issue. If not repaired promptly, not only will fuel consumption rise, but it will also pollute the environment due to excessive emissions. I recommend checking it—a simple method is to start the car and open the oil filler cap. If the shaking worsens, the PCV valve is likely faulty.
