What is the reason why the car can't turn off after starting?

After the car starts, it can't be turned off. There are gasoline engines and diesel engines. Let's introduce them separately:

One: gasoline engine, the specific reasons are:

1, the ignition switch is damaged, and the internal circuit of the ignition switch is broken, which is not controlled by the start key, so that the oil pump and ignition circuit of the vehicle can work continuously.

2. If it is a traditional mechanical gasoline pump, it may be that there is too much carbon in the cylinder, which leads to a flame, which is equivalent to the ignition of the spark plug, but this kind of engine is not common.

Second, the diesel engine, the specific reasons are:

1. The diesel engine has no ignition system. If it cannot be closed after starting, it is caused by the failure of the fuel injection pump. The fuel injection pump can't be cut off when working, so that diesel can enter the cylinder for compression combustion.

2. It is recommended to check or replace the fuel injection pump.