Quote:
Originally Posted by 79300sdtd
i thought any white smoke was water vapor (coolant or condensation from the cold engine and black smoke was unburnt fuel (incomplete combustion and or too much fuel).
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White smoke can also be unburnt fuel upon startup. I started my E300 today after it stood (out of the garage) in the rain for a day, and thank God no environmentalists were driving by--it made that much grayish-white smoke. The cause: I have one bad glowplug (stuck), so even after 30sec of preglow it ran on only five cylinders for about a minute, then the idle smoothed out and the smoke went away completely. The engine was cold and produced white smoke, just like Kuhlrover said happens.
Black smoke is also unburnt fuel, but when the engine is warm...the IP supplies too much fuel for the engine to burn so it has to go somewhere. This is why black smoke is most often seen during WOIP Italian tune-ups.