The reason the car is shaking at the start is:

1. The automobile engine is installed loose or the first shaft of the transmission is not coaxial with the center line of the engine crankshaft;

2, the clutch is locked or the connection is loose;

3, the clutch plate is seriously worn;

4. Uneven distribution of positive pressure between master and slave disks. In general, when the car starts the clutch pressure plate under the action of the spring gradually pushes the clutch plate forward, and then combined with the flywheel. Under normal circumstances, the plane of the flywheel, clutch plate and clutch pressure plate are parallel, so the combined process is smooth and gentle, and the car will start relatively smoothly.