What are the symptoms of a faulty exhaust valve in an Audi car?

[LaRebecca]

In the morning when the car is cold, symptoms such as unstable idling and severe shaking are signs of a faulty exhaust valve in an Audi. The simplest ways to determine if the exhaust valve is faulty are: 1. Start the tachometer; if the RPM exceeds 1000 and the idling is unstable, listening to the sound can confirm the exhaust valve is faulty. 2. If the exhaust valve is damaged, the dashboard will show the engine fault light, but this does not affect continued use. Only after replacing the new exhaust valve and clearing the fault light will normal operation resume. 3. Check if there is blue smoke from the exhaust pipe and whether the engine oil burns too quickly. During acceleration or deceleration, you may feel shaking, and the engine's idle RPM will be about 100 RPM higher than usual.