What are the symptoms of a faulty exhaust valve?
2 Answers
The symptoms of a faulty exhaust valve: Excessive exhaust gas is introduced into the engine cylinders, which will affect the normal operation of the engine. Especially when the engine is idling, running at low speed with small load, high-speed operation, rapid acceleration, rapid deceleration, or when the engine is running in a cold state, excessive recirculated exhaust gas will seriously affect the engine's performance, leading to unstable idling, poor acceleration, insufficient power, and other faults. The function of the exhaust valve is to recirculate exhaust gas. The working principle of the exhaust valve is that the high-pressure gas from the compressor enters the exhaust valve and then the guide vanes of the exhaust valve, flowing in a spiral pattern along the guide vanes. The lubricating oil is separated from the working gas by centrifugal force and gravity, flowing down along the inner wall of the cylinder.
I've been driving for over a decade and once experienced a failed PCV valve. The car felt completely powerless, with sluggish acceleration like a drunkard's weak movements. It was worse at idle—stalling frequently, especially embarrassing at red lights. Fuel consumption soared; my usual 500 km per tank dropped to barely 450 km. The dashboard warning light stayed on—I initially thought it was a loose gas cap, but the mechanic diagnosed a stuck PCV valve not circulating. After fixing it, everything returned to normal. I recommend addressing similar issues immediately to avoid breakdowns or accidents. During maintenance, regularly check the valve's condition—replacing it is simple and cost-effective.
