Why does the BMW 1 Series shake when starting?

1 Answers
McWilliam
07/30/25 7:49am
BMW 1 Series shake when starting is caused by carbon deposits, weak ignition, low cylinder pressure, unqualified fuel, etc. The poor quality of the car's fuel leads to poor combustion effect, so carbon deposits will appear in the cylinder, causing the fuel injector to clog. Excessive carbon deposits on the inner wall of the throttle valve will result in insufficient air intake, making it difficult to start. After the water temperature reaches the normal operating temperature of the engine, the excessive opening of the throttle valve exceeds the normal idle value, causing the idle speed to fluctuate. The BMW 1 Series is a compact car equipped with a 1.5t turbocharged engine, with a maximum torque of 220 Nm. The car has a length, width, and height of 4462mm, 1803mm, and 1446mm respectively, with a wheelbase of 2670mm, and is equipped with a 7-speed dual-clutch transmission.
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