What Causes Idle Vibration When the Air Conditioner is On?
1 Answers
The main reason for idle vibration when the air conditioner is on is excessive compressor pressure. Below are the relevant explanations: 1. Throttle valve blockage: Generally, a car's idle speed is maintained at around 800 RPM. When the air conditioner is turned on, the idle speed should normally increase accordingly, usually staying above 1000 RPM to avoid idle vibration. If the idle speed vibrates when the air conditioner is on, cleaning the throttle valve and re-matching it may help. 2. Ignition coil breakdown: If the idle speed vibrates when the air conditioner is on, it indicates a fault in the ignition coil, spark plug, or cylinder wire, usually caused by the ignition coil being broken down. 3. Excessive compressor pressure: If the air conditioner pressure is too high, it increases the engine load, causing vibration. Poor condenser heat dissipation or excessive refrigerant may lead to excessive pressure, indirectly causing vibration.