What are the symptoms of a damaged car exhaust valve?
2 Answers
Damage to the exhaust valve can cause engine shaking or even stalling during idle. The specific effects are as follows: 1. Impact of a damaged exhaust valve: 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. 2. Function of the exhaust valve: The exhaust valve serves to separate oil and gas. When functioning normally, it only draws in exhaust gas without sucking in oil. If the exhaust valve is damaged, it loses this oil-gas separation capability, potentially drawing in oil along with air, allowing oil to enter the combustion chamber, resulting in oil burning and blue smoke emissions.
I've been driving for twenty years, and the PCV valve has failed more than once. The symptoms are too obvious. When idling at a red light, the engine shakes violently, as if the whole car is trembling, accompanied by rattling noises, and the tachometer needle jumps around. There's no power when accelerating—stepping on the gas pedal only makes the car crawl slowly, struggling even on small slopes. Fuel consumption also skyrockets. I calculated that a full tank used to last 500 kilometers, but after the failure, it barely reaches 400, wasting money. Black smoke occasionally puffs from the tailpipe, polluting the air, and a strange smell lingers inside the car. The check engine light stays on as a warning. If left unfixed, severe carbon buildup in the engine will shorten its lifespan. At the first sign of these symptoms, head to a professional shop for inspection and repair—don’t delay until it becomes a bigger problem. Safe driving comes first.
