Black smoke is a indication that the air/fuel mixture is overly rich. Seek professional help to solve the problem.
Service or replace the engine. A vehicle does not emit much smoke if it is in good condition and running properly.
take it to the car shop
oxygen
Not all of the time Black smoke is usually excess fuel, blue smoke is usually excess oil and white smoke is usually engine coolant. So my guess is your vehicle has fuel injection or carburetor problems.
When a steam engine's fire is burning efficiently, it produces very little smoke and what you are really seeing is white steam. When coal has just been added to the fire, or the fire is burning inefficiently (perhaps too much coal) it produces grey or black smoke.
The smoke produced by a vehicle is a combination of physical and chemical changes. The combustion of fuel in the engine is a chemical change that produces gases, while the dispersal of these gases into the air involves physical changes such as condensation and diffusion.
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Catalytic converters clog due to the carbon that the car produces. Usually, when the carbon has built up inside the cat., black smoke will come out of the tailpipe when you rev the engine. In extreme cases, black soot is visible on the ground next to the vehicle's tailpipe. Crystal Woll
Burning oil typically produces blue-gray smoke. If the smoke is quite dark or black, it may indicate a more serious issue with the engine or excessive oil consumption.
Black smoke is just unburnt fuel in a diesel if the vehicle is not modified in any way to make this happen then something is causing it to not burn it all, it will not harm it but you should figure out why its not burning all of its fuel. (most diesels will spit out a little black smoke)
what type of vehicle ? black smoke is a rich fuel condition carb. loading up or chock sticking closed would be the first place to look
The vehicle is running rich. Too much fuel to the amount of air.