What Causes BMW Car Idle Vibration?
2 Answers
BMW car idle vibration can be attributed to the following specific reasons: 1. Dirty Air Filter: The air filter is designed to protect the engine and reduce wear, typically requiring replacement every 10,000 kilometers. If not replaced in time, insufficient air intake can lead to low idle speed, causing engine vibration. Simply replacing the filter element can resolve this issue. 2. High-Voltage Line Break: A high-voltage line break refers to a break in the conductor core of the high-voltage line, which can affect ignition and cause engine vibration. Use a multimeter to measure the resistance and replace any lines with significantly higher resistance. 3. Clogged Fuel Injector: The fuel injector in an electronic fuel injection car is a key component for fuel injection, with a long lifespan that can reach hundreds of thousands of kilometers. However, gum deposits in gasoline can clog the injector nozzles, leading to inconsistent fuel injection among injectors. This inconsistency causes uneven cylinder operation and engine vibration. The solution is to remove and clean the injectors.
Last time I drove my BMW 3 Series, the body shook severely at idle, which was very uncomfortable. I consulted a friend at the auto repair shop, and the most common causes are aging spark plugs or issues with the ignition coil, which make the engine run unevenly. Carbon buildup is also a key factor. BMWs often drive at low speeds in the city, leading to clogged fuel injection systems or dirty intake tracts, resulting in incomplete combustion of the air-fuel mixture and causing vibrations. Additionally, loose or damaged engine mounts can fail to effectively absorb engine vibrations, transmitting the shaking directly to the body. If left unchecked, the shaking can worsen, fuel consumption may increase, and engine components could be damaged. I promptly took it to the dealership for diagnostics, cleaned the throttle body, and replaced the mounts, which significantly improved stability. I recommend not delaying—if you notice any abnormalities, get them checked early, especially since BMWs demand high precision in handling.
