It usually means too much fuel or not enough spark.
Soot is typically black in color.
Incomplete combustion of carbon-containing compounds, such as hydrocarbons, can lead to the formation of black residue due to the production of elemental carbon (soot). This soot is responsible for the black color seen in the residue.
The black deposit produced represents soot particles, heated to incandescence. It comes about when the combustion of air is insufficient.
If you think to black soot this is formed from tiny carbon particles.
Yes, when a match burns, incomplete combustion can produce soot. Soot is a fine black powder composed mainly of carbon particles that result from organic matter not burning completely.
burning oil
running too rich check the air filter could also be defective injectors
You have worn valve seals and posibly bad valve guides.
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
Excess fuel causes black smoke.
Running rich, depending on year of vehicle it's possibly a o2 sensor, fuel system problem, carb if so equipped. Time for you to do some diagnostics
Soot is typically black in color.
Incomplete combustion of carbon-containing compounds, such as hydrocarbons, can lead to the formation of black residue due to the production of elemental carbon (soot). This soot is responsible for the black color seen in the residue.
oil getting by the rings causes white smoke and oil dripping out of the tailpipe.
bad rings or really bad valve seals.
The city bus emitted a steady stream of black soot from its tailpipe.
Black soot in the tailpipe typically indicates incomplete combustion of fuel in the engine, leading to the formation of carbon deposits that are expelled through the exhaust system. This could be caused by issues such as a clogged air filter, malfunctioning fuel injectors, or a problem with the ignition system. It is best to have a mechanic inspect and diagnose the issue to prevent further damage to the engine.