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BMW 5 Series Air Conditioning Vibration Solution?

2 Answers

VonJulian

07/24/25 9:25am

When a BMW 5 Series experiences vibration after turning on the air conditioning, it is necessary to consider fuel system issues. The idle speed with air conditioning on requires stable combustion, and the computer adjusts the fuel injection and air intake to maintain stable air-fuel mixture. This indicates a dirty fuel system or low fuel atomization efficiency. The specific solutions are as follows: 1. Air Conditioning Idle Speed Booster: Most vehicles are equipped with an engine air conditioning idle speed booster. When the air conditioning compressor is operating, the air conditioning system simultaneously sends a command to increase the engine speed to the required range, solving the issue of engine vibration when the air conditioning is on. 2. Check the Circuit and Adjust the Idle Speed Device: If the vehicle is not equipped with an idle speed booster, installing one is recommended, as it is not expensive. If the vehicle comes with this device from the factory, simply check the circuit and adjust the idle speed device.

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SanEli

08/11/25 4:48am

My BMW 5 Series used to have noticeable vibrations when the AC was on during summer. At first, I thought it was a minor issue, but it gradually worsened. I consulted a car-savvy friend for help, and he mentioned this is usually caused by increased engine load. Upon inspection, we found severe carbon buildup in the throttle body, disrupting airflow and causing unstable idling. Additionally, aging ignition coils were problematic—after replacing the spark plugs, the vibrations significantly reduced. We also adjusted the tension of the AC compressor belt. The whole process took some time, but the driving experience returned to normal afterward. I’d advise fellow drivers not to overlook these details—early checks bring peace of mind.

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