What is the reason why there is oil in the accelerator of the car?

There is oil in the throttle of an automobile because the exhaust gas from the engine is recycled to the air intake, which will form dirt on the throttle for a long time, which is a normal phenomenon. The impact of throttle damage is: 1, the engine idle speed is unstable, and it is difficult to start the engine, especially the cold start; 2, the engine has no idle speed; 3. Insufficient engine power, poor acceleration performance and unstable operation; 4. the exhaust pipe of the car emits black smoke, which increases fuel consumption. Causes of dirty throttle: 1, vehicle environment, poor filtration of air intake filter element, and heavy dust in the surrounding environment; 2, the variety of engine oil is not good, and the evaporation is large; 3. Engine oil vapor and impurities are generated in the crankcase; 4. Throttle sucks dust after flameout.