Originally Posted by Hathwaydc1
Ok, more fun stuff to look at.
Thank you again.
The thing I should have also mentioned, was that the engine idles clean (for the most part). Would that still happen with clogged air filter? I guess more acceleration = more fuel and more air, so maybe?
Lots of clean air is paramount for the health and performance of a diesel engine. Checking the intake system for leaks and/or restrictions is easy and should be part of regular inspection and preventive maintenance. That should include a close look a the exhaust piping between engine and turbo. Any leak there will also compromise the amount of fresh air the engine gets.
Yes, you get acceleration through burning more fuel, which needs more air. If that air is not there, the engine will smoke (black) instead of delivering the desired power.
When people "roll coal" they are spewing chemical energy out of the exhaust that could have been converted to acceleration by proper combustion. In this case they have crammed all the air that will fit into the cylinders and then added fuel beyond what the engine can possibly burn. A slight dark haze at full pedal will give you a little more power at the expense of higher exhaust gas temperature and lower fuel economy, but billowing clouds are just stupid.
White smoke that smells like raw diesel fuel is also unconverted chemical energy but the cause is either bad atomization from worn out pump/nozzles or low compression in one or several cylinders. It is great for keeping mosquitoes down though.
White steam that smells like antifreeze is really bad news. Coolant is getting into the cylinders, typically through the head gaskets. Fixing that is expensive and if not fixed early, even more expensive.