What are the symptoms of a faulty idle control valve?

[LaPiper]

Symptoms of a faulty idle control valve: 1. A damaged idle valve will affect engine performance, resulting in insufficient power. Under idle conditions, fuel tends to burn incompletely, and the piston valves are more prone to carbon buildup. Excessive carbon deposits directly impact fuel economy and can also affect the engine's performance and lifespan. 2. After the idle valve is damaged, a strong gasoline odor may be noticeable when the engine is warm, and the car's idle speed will become unstable, fluctuating between high and low. An excessively high idle speed increases fuel consumption, and the higher the idle speed, the greater the CO emissions, thereby increasing vehicle exhaust emissions.