The Great Wall H5 has traveled more than 4,000 kilometers. Why is there a lot of carbon deposit in the accelerator? I didn't explain why when I went to the 4S shop.

The throttle is seriously dirty-the reason is that the air quality is not good; The air filter was not replaced in time. It is best not to change the oil. Check it often and change it when it is dirty. Check and clean the throttle. This has nothing to do with whether the car is new or not. This is a problem that needs a new solution.

That's actually not carbon deposition, but dirt mixed with granular soil and engine oil at the air inlet. This is very fine dust.