Holey DPF!

[Lonestar10]

EGR system if not working correctly can circulate more soot back into the cylinder and more than needed exhaust gases causing even more soot production per burn cycle

Oil intrusion be it from exhaust valve seals/turbo seals anything that can put liquid oil into the cooler exhaust stream so that it doesnt burn.

Doser injector being bad and constantly leaking fuel into the exhaust

A sensor throwing a faulty reading but not enough to throw a code IMAP/Exhaust Back Pressure/DPF sensors/EGR sensors/EGR Valve

Exhaust leaks sometimes a tell tale sign of an exhaust leak is an excessive amount of white smoke when it regens during driving its letting enough O2 get into the system and the doser fuel ignites before it gets to its intended destination.

you did injectors so you shouldnt have an injector over fueling.........


and as you said you havent checked really for air leaks i would definately do that.

you can start by checking if you can have someone hold the RPMs up high or if you can run them up with cruise buttons then go around putting soapy water on every point in the system that can come apart

so this means all silicone boots also dont just spray the ends of the boots spray the boots themselves as even though you dont see a hole in a boot doesnt mean air is not penetrating through. just soak every point and use alot of soap in the soap water mix to make sure even the smallest air leaks will show bubbles.

make sure to go from the turbo around the CAC best you can try to get where the CAC core means up with its side tanks best you can then go all the way to where the intake meats up with the head.



another thing if you can just pull the exhaust off the back of turbo and look as far down it as you can to see if theres any oil or fuel trails also inspect the doser injector start the truck let it run for a bit with exhaust disconnected and watch to see if doser injector starts to get wet if it does it needs replacing if not take care of any carbon build up around the nozzle.


thats all i can come up with off the top of my head.