Why is the throttle dirty? Why is there carbon deposit on the throttle?

In fact, this question is very simple and easy to understand. We all know that automobile engines generate power through in-cylinder combustion, and the necessary conditions are fuel and air. The acquisition of air is that the piston and valve inside the engine constantly generate suction, and then the throttle valve controls the opening to inhale. Although there is an air filter, the air environment is not good or working for a long time will lead to dirty throttle. Of course, there is also a situation where the engine oil supply is not smooth or the oil burns. Because most cars need energy saving and environmental protection, they will be equipped with waste gas valves. Its function is to absorb the waste gas residue produced after combustion through the pipeline and burn it again with the throttle valve, so it will soon cause carbon deposition on the throttle valve, which needs to be checked and properly maintained. So finally, to sum up, in fact, simply speaking, the throttle of a car is like a human nose, and it is normal to be dirty. In daily maintenance, it is necessary to change the air filter regularly. It is recommended to clean every 30,000 kilometers. If possible, you can drive higher, which will help reduce the carbon deposition in the engine.