What Causes Car Vibration When Starting the Air Conditioning?

[StDylan]

Here are the specific reasons for car vibration when starting the air conditioning: 1. Shock absorber system failure: The shock absorber system is mainly responsible for filtering engine vibrations during operation. If there is a problem with the shock absorbers, 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 systems can easily cause vibrations. The engine increases load due to the activation of electrical devices, causing 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 electrical systems, especially the air conditioning, the engine often vibrates. This vibration is likely caused by aging shock absorbers and requires timely replacement. 2. Unstable oil pressure: If the engine carbon deposits have been cleaned, the throttle valve has been washed, and the oil pads have been replaced, but the car body still vibrates, it is recommended to check the fuel supply pressure and the intake pressure sensor at a repair shop. Abnormal fuel pump supply pressure or incorrect intake pressure sensor values and improper operation can cause car body vibration. 3. Cold start: The main reason for car body vibration during a cold start is incomplete fuel combustion, resulting in insufficient power. With low ignition energy, more fuel is needed to meet power requirements when starting at low fuel and lubricant temperatures. Over time, the spark plug gap gradually increases, leading to decreased ignition energy and poor fuel atomization, causing car body vibration. In addition, aging ignition coils, aging spark plug high-voltage wires, or leakage can also reduce ignition energy.