What Causes Sudden Strong Vibration When the Car Air Conditioner is Turned On?

[LaLincoln]

There are several reasons why a car may experience sudden strong vibration when the air conditioner is turned on: 1. Dirty throttle body: If the throttle body is dirty, turning on the air conditioner can increase the engine idle load, leading to steering wheel vibration. 2. Poor fuel quality: Low-quality fuel can impair engine performance, causing idle vibration issues. 3. Ignition system problems: Faults in the car's ignition system can result in poor ignition performance and weak spark plug firing, leading to unstable conditions such as vibration during idle. 4. Excessive engine carbon buildup: If there is too much carbon buildup inside the engine, the fuel injected by the injectors during a cold start can be largely absorbed by the carbon deposits, resulting in a lean air-fuel mixture during cold starts, making it difficult to start and causing idle vibration after a cold start.