What Causes Engine Vibration in the New BMW 3 Series?

[JordanMarie]

The causes of engine vibration in the new BMW 3 Series are as follows: Severe Engine Carbon Buildup: The most common cause of car vibration is a dirty throttle body or excessive carbon deposits in the fuel injectors. When there is too much carbon buildup inside the engine, the gasoline sprayed by the cold-start injector is largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts. This makes starting difficult. Under these conditions, the engine only starts easily once the carbon deposits are saturated with gasoline. After starting, the gasoline adsorbed on the carbon deposits is drawn into the cylinders by the engine's vacuum suction, making the air-fuel mixture too rich. The engine's combustible mixture alternates between being too lean and too rich, causing idle vibration after a cold start. Aging of Engine Components: Car vibration can also be related to aging engine mounts. Engine mounts are essentially the shock absorption system for the engine. They absorb minor vibrations during engine operation. If the engine mounts are faulty, these vibrations will be transmitted to the steering wheel and the cabin, causing idle vibration.