What should I do if the speed of Excelle 1.6 gear rises sharply?

As for the analysis of the situation you mentioned, it may be that the throttle or idle motor is stuck or beyond its adjustment range because of carbon deposition, or the throttle shaft is stuck because of too much carbon deposition, which will cause the idle speed to rise after receiving oil. After cleaning the throttle, the idle speed of oil collection will increase, which has happened many times. This is because when cleaning the carbon deposit, the carbon deposit solution enters the throttle shaft, causing the throttle shaft and the valve body base to get stuck. It is also possible that the throttle valve cannot completely return to the initial position set by the manufacturer because it is not initialized after cleaning, and the throttle valve has a large opening, which leads to the phenomenon of high idle speed. It may be a problem with the engine computer again, but it needs a special diagnostic computer to determine it.