What is the reason for the idle jitter after KIA KX5 hot car?

There are many reasons for idling jitter of automobile engines, the most important of which are spark plugs and fuel nozzles.

After long-term use, the spark gap of the spark plug electrode will become larger, which will affect the ignition of the spark plug, and the spark plug may occasionally fail to ignite, and the engine will shake. Another main reason is the fuel nozzle. When the fuel injector works, the gum in gasoline is easy to remain at the bottom of the fuel injector under the high temperature environment of the engine. If there is too much gum, it will affect the work of the nozzle, causing the nozzle to stick and causing the engine to shake.

There are two other possibilities: ignition coil and throttle. If there is something wrong with the ignition coil or the throttle is too dirty, it will also cause the engine to shake, but the probability of these two points is not great. 1, carbon deposition problem. I'm sure I know something about carbon deposition. This is due to the long-term use of vehicles without corresponding treatment. There are more or less vehicles with carbon deposits, and improper use is the chief culprit leading to the increase of carbon deposits. Carbon deposition to a certain extent will lead to jitter.