What's wrong with the unstable idle speed of the truck?

About "What's wrong with the unstable idle speed of freight cars?" Introduce the following related contents:

Causes of unstable idle speed of freight cars;

1, dirty and worn mechanical parts, incorrect installation, etc. , which leads to the power change of a single cylinder, the power imbalance of each cylinder, the unstable idle speed of the engine, the abnormal electronic control system of the engine, the poor combustion of the mixed gas, the difficulty in balancing the power of each cylinder, and the unstable idle speed of the engine;

2. Too much carbon and dirt are deposited in the throttle valve and the surrounding air intake, and the cross-sectional area of the air passage changes, which makes the control unit unable to accurately control the idle intake, resulting in the mixture being too rich or too thin and abnormal combustion;

3. The fuel pressure is too low, which directly leads to the fog of sprayed oil and poor spray quality. In severe cases, only some oil droplets appear at the oil injection port. The main performance is that the mixture is discharged too thinly, which leads to unstable idle speed and low speed of the engine, often accompanied by fire.