What's wrong with the black smoke from the exhaust of Tiggo 3?

Your situation is mainly caused by poor engine combustion and too rich mixture.

There are several main reasons for your situation.

First, the fuel pressure is too high, which is generally caused by the damage of the oil pressure regulator or the blockage of the oil return pipe.

Second, the engine intake pipe or exhaust pipe is blocked, resulting in insufficient intake and exhaust volume and excessive mixture.

Third, the nozzle hole of the injector is too large, which may generally be caused by improper cleaning and injection.

Fourthly, sensor failures of electronic control system generally include water temperature, intake air temperature, air flowmeter, throttle position sensor, atmospheric pressure sensor, oxygen sensor, etc.

Finally, there is something wrong with the engine computer, but it rarely happens. If there is something wrong with your car, ask the car mechanic. 4S shop professional technician, 10 minutes to solve.