Why does the BMW 116 experience intermittent idling vibration?
1 Answers
BMW 116 intermittent idling vibration may be caused by severe engine carbon deposits or ignition system issues. Severe engine carbon deposits: The most common cause of car vibration is a dirty throttle body or excessive carbon buildup in the fuel injectors. When there is too much carbon deposit inside the engine, the gasoline sprayed by the cold-start injector will be largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts and making ignition difficult. In this situation, the engine will only start easily after the carbon deposits have absorbed enough gasoline to reach saturation. After starting, the gasoline adsorbed on the carbon deposits will be drawn into the combustion chamber by the engine's vacuum suction, making the air-fuel mixture too rich. This fluctuation between lean and rich mixtures causes idling vibration after a cold start. The lower the temperature, the more fuel is required for cold starts, and the presence of carbon deposits will significantly affect whether the cold start proceeds smoothly. Ignition system issues: Check the working condition of the spark plugs, high-voltage wires, and ignition coils. Poor performance of the ignition system or inadequate spark plug firing can also lead to such fault symptoms.
