Why does a BMW shake when cold?

1 Answers
VonEliana
07/29/25 4:21pm
The reasons for a BMW shaking when cold are: 1. Low temperature: The exhaust pipe and oxygen sensor are cold, causing the vehicle's ECU to be unable to obtain accurate data promptly, resulting in errors in ignition and fuel-air mixture control, which weakens the vehicle's power output; 2. Carbon buildup in the engine: Carbon deposits on the throttle body have adhesion, preventing the fuel injection from reaching the required gasoline amount for combustion; 3. Aging spark plugs: Different ignition gaps cause deviations in the power output of each cylinder. Taking the BMW 525Li as an example, it is a mid-to-large-sized 4-door, 5-seater sedan with body dimensions of: length 5106mm, width 1868mm, height 1500mm, a wheelbase of 3105mm, and a fuel tank capacity of 68 liters.
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