What are the symptoms of engine valve failure?
2 Answers
Engine valve failure symptoms: 1. Unstable cylinder operation, engine shaking, lack of power, leading to exhaust pipe blockage, and in severe cases, black smoke from the exhaust; 2. A faulty engine valve will produce abnormal noises, cause unstable idle speed or poor acceleration, and in severe cases, may lead to difficulty starting the engine, failure to ignite, as well as air leakage or increased carbon buildup in the car. The throttle valve is a controllable valve that regulates air intake into the engine. After entering the intake pipe, the air mixes with gasoline to form a combustible mixture, which then burns to perform work. The throttle valve is connected to the air filter at the top and the engine block at the bottom, and is referred to as the throat of the automobile engine.
After driving for so many years, what I fear the most is encountering valve issues. Starting the engine feels particularly laborious, often requiring multiple attempts to ignite. At idle, the steering wheel shakes like a massage chair, making even stopping at red lights feel uncomfortable. Acceleration becomes sluggish—stepping on the gas pedal feels like stepping on cotton, with the RPM rising but the speed barely increasing. Even more exaggerated is the sudden spike in fuel consumption, burning two to three liters more per 100 kilometers than before. The exhaust may emit black or blue smoke, with a noticeable gasoline smell in the tailpipe. When these symptoms appear, it's almost certainly due to poor valve sealing or abnormal clearance. It's best to visit a reliable repair shop immediately to check whether it's a carbon buildup issue or if parts need replacement.
