Unfortunately my Ford rolls coal to a small degree after the Cummins was slightly modified. I need the extra power in the Appalachians. It means the truck is not burning fuel efficiently. I’m looking for a way to get more complete combustion. Until then I try not to rabbit the throttle.
Air flow is the answer. Until your turbo spools up even a good tuned engine will smoke a little. Check out EFI Live if you have some bucks to burn.
What kind of Ford has a Cummins?
Did you swap in that Cummins or was there a year that I wasn’t aware of it’s offering ?
To pull power I still think the Cummins is the “simplest”. The Ford engines are more complex than a BMW 7.
And yes, driving the rockies is incredibly demanding. Not even Colorado regulators seem to grasp this.
Is yours and older 12v Cummins? Unless you have a turbo with variable geometry, you are going to get smoke out of a Cummins on the low side until the turbo spools. In the end, more boost is the solution to black smoke.