What are the symptoms of a damaged throttle valve?

[VanessaDella]

Symptoms of a damaged throttle valve are as follows: 1. Unstable engine idle or no idle: The engine idle is unstable, the high idle persists without dropping, and the engine is difficult to start, especially during cold starts. 2. Insufficient power: The engine is hard to start. Once started, the engine lacks power, has poor acceleration performance, and operates unstably. 3. Black smoke from the exhaust pipe: The car's exhaust pipe emits black smoke, and fuel consumption increases. Additional information: The throttle valve is a controllable valve that regulates the entry of air into the engine. After entering the intake pipe, the air mixes with gasoline to form a combustible mixture, which then burns to generate power. It connects to the air filter at the top and the engine block at the bottom, and is often referred to as the throat of the car engine.