black smoke is usually a sign of bad piston rings, meaning they arent sealing correctly, and meaning that they need replaced which means a total engine rebuild basically.
carbon result of incomplete combustion.
they have elected a pope? in cold weather it is normal to see white smoke coming out of your tailpipe. the one you have to worry about is the black or the blue smoke
lack of air or overfueling although there are many causes of both
running too rich check the air filter could also be defective injectors
Black smoke, from any diesel, is the result of partially burned fuel. Overfueling will cause black smoke.
Black smoke indicates excessive fuel possibly the engine is flooding this would also explain the gurgling.
neat time you fill your car with fuel make sure you buy some injector cleaners this will help the problem.
black is excess fuel
how can i get black exhaust smoke stuck on my dual exhaust
Need to know why this is necessary.
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
it can be unburned fuel damaged turbo charger etc. light amount of smoke can be normal large amounts = problem.