So I've got a bit of a weird thing happening with my rig that I haven't seen before, and was wondering if anyone could offer advice/confirm my hypothesis.
So I drive a '22 Pete 389 for work, and it has an X15 Cummins in it clocking just over 530k right now. Haven't been in the truck long, but it's never given me an issue outside of the coolant temp sensor dying. But this week it started doing something odd. Twice now it's been running fine, usually close to idle, and it will just lug down and stall, heavy smoke out the stacks like it's over fueling.
Here's the odd thing though, it only does it very close to first start up for the day, and after a key cycle it runs fine. It did it to me Monday morning, but then I drove the truck the entire day without issue, didn't do it at all Tuesday, but then did it again this morning. The fact that it lugs down hard and smokes makes it seem like something is blocking the air intake, but the fact a key cycle or two fixes the problem and then it runs fine, to me, says that isn't it. So I'm wondering if something is starting to die in the VGT that's causing it to basically clamp shut and choke the engine out. Any advice anyone here might have would be much appreciated before I go and throw a new turbo at the problem.