Recently, some car friends, on the road came across an exhaust pipe black smoke Audi A6L, look carefully at this white Audi A6L will find that the position of the exhaust pipe is obviously black, the car friend exclaimed: Audi burns diesel?
If you don't know it on the road, you really think that Audi burns diesel?
The position of the rear bumper is also clearly blackened, in fact, the main reason for the black smoke is incomplete fuel combustion. It may be that the fuel supply time is too late, and the fuel does not have time to fully burn;Incorrect valve clearance or poor air intake, insufficient air intake to prevent the fuel from being completely combusted;The pistons, piston rings and cylinder liners are heavily worn.
It is also possible that the vehicle is overweight, overspeeding for too long run, the fuel supply of the gasoline pump increases, so that the gasoline and air mixing ratio is out of balance, and some gasoline can not be completely burned in the cylinder and emits black smoke. This is the same as when I was a child, when I was riding a tractor in the countryside, once I encountered overweight and climbing, the exhaust port of the tractor would emit a burst of black smoke.
However, the quality of the fuel is also one of the factors that can cause black smoke from the exhaust pipe of a car. If the oil used is not of good quality, it may cause the engine to burn less efficiently, resulting in more smoke.
In addition, the maintenance status of the car may also affect whether it emits black smoke or not. For example, an air filter that is too dirty, a bad spark plug, or a faulty ignition coil can cause black smoke from the engine. Therefore, regular maintenance and inspection of the car, cleaning or replacing key components such as air filters and spark plugs to ensure that it is in good working condition is an important measure to prevent black smoke from the exhaust pipe of the car.