After the modern IX25 is started, the speed pointer fluctuates up and down. What is the reason?

There is no good solution unless you stop driving.

Idle speed fluctuation of cold cars is a common problem, especially for cars that have been used for several years. What can we do besides repairing them?

I'll write a few words here to answer your question, but it's impossible to make the car better out of thin air.

Take a closer look, it should make you spend less money.

Throttle carbon deposition generally does not cause serious fluctuations. If the cold car fluctuates so much, or even shuts down, the hot car will start with the fluctuation.

What I mean by this is that you don't have to clean the throttle first to solve this problem.

The problem of ignition system is most likely to lead to obvious changes in the state of cold car and hot car. This is easy to understand. Igniting the combustible mixture in the cylinder requires less spark energy when the temperature is high and much more spark energy when the car is cold.

Therefore, if the spark energy of the car is insufficient in the cold state, it is most likely to cause uneven work of each cylinder and each cycle, which is the fundamental reason for the fluctuation of vehicle speed.

Serious carbon deposition on the back of intake manifold, air inlet and valve will affect the evaporation and atomization of fuel when the car is cold, resulting in vehicle speed fluctuation.