What are the symptoms of a faulty car EGR valve?
2 Answers
When the car's EGR valve is faulty, it can cause excessive exhaust gas to be directed into the engine's cylinders, which will affect the normal operation of the engine. Particularly during idling, low-speed light-load conditions, high-speed operation, rapid acceleration, rapid deceleration, and when the engine is running cold, excessive recirculated exhaust gas can severely impact engine performance, leading to issues such as unstable idling, poor acceleration, increased fuel consumption, and insufficient power. Content expansion: 1. If the EGR valve is stuck in the fully open position and cannot close completely, it can cause the engine to stall at idle or exhibit unstable idling. It may also result in the emission of large amounts of black smoke during engine operation. Moreover, this problem is not limited to black smoke; it is often accompanied by a noticeable decrease in engine power. 2. If the EGR valve is removed for inspection and its passages are found to be clogged with deposits, a normally closed solenoid valve may fail to seal properly when the coil is de-energized, leading to unstable engine idling, failure to start, backfiring in the intake manifold, or stalling.
Last time my car's PCV valve failed, I didn't notice at first, but later found the engine shaking badly at idle, the whole car seemed to tremble. During acceleration it had no power at all, even with the pedal to the floor, showing obvious power loss. Fuel consumption was significantly higher than usual, just wasting money. The most annoying part was black smoke from the exhaust with an awful stench - that choking smell was unbearable. The check engine light stayed on like a warning. Prolonged neglect could damage the engine, easily causing carbon buildup or catalytic converter failure, which would cost a fortune. I immediately took it to the repair shop where they found the valve stuck or leaking. After replacement, everything returned to normal. Regular maintenance checks of the emission system can prevent these issues, making life much easier.
