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engine tune just a major service then maybe a new exhaust system
Black smoke is a sign of an overly rich fuel/air mixture, unlike blue smoke which is a sign of oil burning. Seek professional help.
If you have an issue with furnace exhaust in your home and soot is exhaust. Please stop wasting your time here. That is dangerous. Call somebody! Nobody here can tell you what it is with out looking at it.
the smoke that comes out of a exhaust pipe is supposed to be white
Yes if you have a 300 win mag
Depending where the noise is coming from but normally this type of question relates to water hammer which is caused by pipes not being secured properly, make sure all piping on walls and in roof are secured down properly with pipe straps, pipe clips or pipe holders.
You may have oil on the exhaust, once this has burnt off the smoke should stop.
What kind of pipe, what feeds the pipe, and where is it located? If it is a floor drain, put some vegetable oil down the p-trap to seal the trap and stop the sewer gases from coming back.
If it's coming out of a crimp joint, replace it. If it comes from a removable connection, replace the "o" rings. Glenn
To stop the black residue from a baseboard heater, the wall around and near the heater should be cleaned as there are dust particles attached to the wall. This is called ghosting which fine particles of soot attach to the wall that is cooler than the temperature.
Repair the pipe of fixture to stop your leak.
You could do that but you would need a trap to stop sewer gas from coming in. The toilet has the trap integrated into it. If you have access to underneath then you could add one.