It would be unburnt fuel
What can cause black sooty exhaust is bad valve guides. When the guides are bad oil leaks into the cylinder when the car isn't running. When the car starts it produces black exhaust.
The burning smell from the exhaust pipe may be caused from oil or transmission fluid leaking into the exhaust pipe. For example, if your turbo is failing on the car, then that can cause leakage from the manifold into the exhaust pipe. There may be other reasons, too, which other people will be better articulating.
Intake Manifold....smelling radiator fluid fumes in cabin or white smoke in exhaust. Exhaust manifold or cylinder head....smelling burnt oil in cabin or black smoke in exhaust
Actually, those are drops of water mixed in with the carbon that lines most exhaust systems. Normal.
Already been done. Diesel Particulate Filters and Diesel Exhaust Fluid.
emissions and exhaust
Internal engine antifreeze leak what else could cause besides headgasket? there is no antifreeze in the oil it is clean
Yes, if the fluid is leaking on the exhaust or the belt is slipping badly.Yes, if the fluid is leaking on the exhaust or the belt is slipping badly.
yes. Though most call it black not blue.
how can i get black exhaust smoke stuck on my dual exhaust
blown turbo - worn turbo bearing causing oil to suck through and into exhaust manifold - results in no power and neat oil burning in the exhaust - major black smoke