There is oil in the accelerator. Why?

When the engine is running, it will produce exhaust gas. At the position of the air cleaner, there is a pipe connected to the upper cover of the engine to exhaust the exhaust gas. Driving a car for a long time will always produce exhaust gas. Even if it can be discharged, it will definitely leave a little at a time. Over time, many a mickle makes a mickle, and this will happen.

Extended data:

How to clean and prevent should pay attention to:

1, which should be dismantled and cleaned;

2. Correct some mistakes in cleaning the throttle valve;

3. The fouling of the throttle is mainly engine oil vapor, followed by particles and moisture in the air. That is to say, using a qualified air filter and removing the crankcase ventilation pipe, the fouling speed of the throttle will be much slower.

The crankshaft is built in the crankcase, and the lower part is connected with the oil bottom. The working temperature of this part is about 100 ~ 180.