Tianlong flagship refuels and emits black smoke. What is the reason?

There are many reasons for black smoke, first of all, there is something wrong with the oil, and then the mixer is too thick. The reason why the mixer exceeds the standard is that the air-fuel ratio is abnormal, the sensor fails, the air-fuel ratio cannot be adjusted automatically, and the fuel injection quantity increases, which leads to the unstable idle speed of the engine and black smoke when accelerating. There is also the nozzle atomization and poor sealing, ignition timing dislocation and so on will also lead to black smoke. Then there is the automobile oil circuit is not smooth, carbon deposit is blocked, too much carbon deposit in throttle, air intake, intake valve and engine, and too much carbon deposit in injector will lead to high fuel consumption. The air filter is dirty and the air is not smooth, which leads to the wrong oil-gas ratio and black smoke, so it needs to be replaced.

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