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changed engine
Black smoke indicates excessive fuel possibly the engine is flooding this would also explain the gurgling.
Black smoke, from any diesel, is the result of partially burned fuel. Overfueling will cause black smoke.
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.
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.
The black smoke is caused by too much diesel fuel being supplied to the engine when you first open the throttle. Quite often this happens when the fuel injectors are worn and /or the turbo is not coming up to speed quick enough.
Unburnt fuel
it can be unburned fuel damaged turbo charger etc. light amount of smoke can be normal large amounts = problem.
Oxygen
you can use chips, power mods, and smoke switches.