What should I do if Chang 'an Swift hangs in the second gear?

Chang 'an Swift shifted into second gear and trembled. The solution is as follows:

The engine bump should be caused by poor operation. Maybe a cylinder is not working well, or the throttle is too dirty. You can check whether the throttle, ignition system and spark plug are stuck by carbon deposit. This problem should be easily solved in the pit.

Specific performance and methods are as follows:

1, the throttle is dirty. When the cold car starts, the engine has insufficient air intake, resulting in insufficient combustion. After a few seconds, the computer will automatically adjust and it will be fine.

2. The carbon deposit in the intake valve is serious. The oil sprayed by the cold car is sprayed to the intake valve, and most of it is absorbed by the carbon deposit in the valve, resulting in too thin fuel in the cylinder, and then it shakes a few times. These two kinds are very common. The solution is cleaning.

For the first problem, clean the throttle valve and air intake in 4S, and for the second problem, use advanced fuel additives to clean the carbon deposit in the air intake valve. This problem can basically be solved.