How to judge whether the throttle is dirty?

The way to judge whether the throttle is dirty is: when driving, if you feel weak acceleration, idling jitter and unstable idling, the throttle is dirty. The cleaning cycle of the throttle valve is about 20,000 kilometers, and the reasons for its dirtiness are: 1, poor filtration of the air inlet filter element and heavy dust in the surrounding environment; 2. The quality of engine oil is not good, and the evaporation is large; 3. Oil, gas and impurities will be produced in the crankcase. Throttle is a controllable valve that controls air to enter the engine. Its function is to control the air to enter the engine, and the gas will be mixed with gasoline into a combustible mixture after entering the intake pipe, so that the combustion is successful.