Nope, it's your IDM, trust me. I went through the same rig-a-ma-role your are. I would have given a $1000 to someone who could have written to me what I am gonna tell you now. Symptoms were just the same. Water gets in those (supposedly sealed) IDM units over time and causes bugs that eventually go to complete failure, just like you describe.
White smoke from the tailpipe after a fair amout of cranking is vaporized fuel. Stick your nose in it and you will know.
Definitive test to confirm your problem is the buzz test. I did mine with Android app CarGuage Pro, about $5, and a "OBDLink" OBD dongle, about $35. With those two things you can read and test everything on your PCM, including running a buzz test, cylinder contribution, FICM voltage, IPR voltage... you get the picture.
Save yourself a ton of headaches and do a buzz test.
I told you that it wasn't the IDM when you said that you were getting smoke out of the tailpipe around 50 or so post before you came out and said that a friend dumped diesel down the turbo. Now if your friend hadn't dumped fuel down the turbo and you were getting white smoke out of the tailpipe that would indicate that the injectors were working putting fuel into the cylinders.
As another poster said, keep that friend away from your diesel
Right now until you start using the Forscan to to a buzz test all bets are off on what is working and what isn't.
Hey Bugman. My IDM went out on one bank, confirmed by a buzz test. The truck would not start, but plenty of unburned fuel from the right bank was making white smoke out the tailpipe. Of course that throws a guy off, and since my IDM had been replace a year earlier, I was looking the other way. These things can be tricky for sure.
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