Why does the Buick Excelle manual transmission shake severely when starting?

[LaElisa]

The reasons for severe shaking when starting the Buick Excelle manual transmission are as follows: 1. Excessive carbon deposits: The most common cause of car shaking is a dirty throttle body or excessive carbon deposits on 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 and making it difficult to start. 2. Aging components: Car shaking is also related to aging engine mounts. Engine mounts are essentially the shock absorption system of the engine, responsible for absorbing minor vibrations during operation. If the engine mounts are faulty, these vibrations can be transmitted to the steering wheel and the cabin, causing shaking during idle.