black smoke comes from excessive fuel. could be a sign of its not getting burnt Which could be bad. usually you get this after people start cranking up a diesel for more power, of corse your gonna need more fuel to go with all those extra pony's!
Black smoke, from any diesel, is the result of partially burned fuel. Overfueling will cause black smoke.
black smoke in a diesel can be caused by a couple of things:- dirty injectors, - a bad fuel pump - a bad turbo - incorrect fuel pump timing - or incorrect settings in computer - heavy acceleration from low RPM ADD A PROGRAMMER, mine has a sct x3 tuner, black smoke pores into the road when i roll unto it.
Air filter dirty or bad injector
In a diesel engine, blue smoke is an indication of oil being burned. Black smoke means that there is incomplete combustion of the fuel. White smoke can be seen when raw diesel fuel is not being burned.
its a diesel, you will see black smoke alot.
The black smoke that a diesel engine blows out is fuel that is unburned. The black smoke can be caused from over-fueling, poor fuel quality, or dirty or worn fuel injectors.
Could be a diesel? If not then replace your oxygen sensor on your exhaust. A bad oxygen sensor causes the exhaust smoke to be dark in color.
It is completely normal for a diesel to smoke black. But, if it just now started to smoke black and everything on the truck is stock, go get it checked out by a mechanic. You could have bad fuel injectors or a dirty air filter. Start with the simple stuff first. And, I'd say from it being a 2004 Powerstroke 6.0L, that your injectors are probably bad.
Possibly bad glow plugs.
Unburnt fuel
Oxygen
you can use chips, power mods, and smoke switches.