What Causes Car Vibration When Braking with Air Conditioning On?

[DiPaisley]

Here are the specific reasons for car vibration when braking with air conditioning on: 1. Suspension system failure: The suspension system is mainly responsible for filtering engine vibrations during operation. If there is a problem with the suspension, these vibrations will be directly transmitted to the steering wheel and the cabin, affecting driving. When the engine is idling, turning on the vehicle's electrical system can also easily cause vibrations. The engine increases its load due to the electrical system being turned on, causing the idle speed to drop. To compensate for the vibration caused by the idle speed drop, the engine will automatically increase the speed. When turning on the electrical system, especially the air conditioning, the engine often vibrates. This vibration is likely caused by aging suspension components and requires timely replacement. 2. Unstable oil pressure: If the engine carbon deposits have been cleaned, the throttle body has been cleaned, and the oil pads have been replaced, but the car still vibrates, it is recommended to check the fuel supply pressure and the intake pressure sensor at a repair shop. If the fuel pump supply pressure is abnormal or the intake pressure sensor values are incorrect or malfunctioning, it can cause car vibration. 3. Cold start: The main reason for car vibration during a cold start is insufficient fuel combustion, resulting in insufficient power. The ignition energy is relatively low, and when starting, with lower temperatures of fuel and lubricating oil, more throttle is needed to meet the power demand. Over time, the gap between the spark plug electrodes gradually increases, leading to decreased ignition energy and poor fuel atomization, which causes car vibration. Additionally, aging ignition coils, aging spark plug high-voltage wires, or leakage can also reduce ignition energy.