Maxxforce DT (466) low power

For the exhaust smell check the Exhaust back pressure valve/down pipe sometimes on those the pipe on the outlet of the EBPV is hard to get to seal off
Check the boost control tubes there is one that runs from the intake throttle valve adapter over the valve cover to the boost control solenoid which is mounted on the pipe between the low and high pressure turbos all of the boost control tubes are connected there make sure none of them are broken.
Is it a High horsepower DT? If it is it will have an additional intercooler on the valve cover, also check that the IMP sensor or the bore it is mounted in is clogged with soot, it’s in the intake manifold it is a 3 wire sensor the 2 wire beside it is manifold temp, also check to see if it has been converted to open crankcase system. If it hasn’t been done there will be about a 3/4-1” hose attached to the 90* air inlet elbow at the low psi turbo, if it hasn’t there is a good possibility the turbos are coked, and not all serial number engines are allowed to be converted. Worth checking into. If it hasn’t been I would recommend it, even though it’s somewhat pricey on the front end.

 

Have you tried a parked regen? You said you have done 70mph so it should have done it on its own but maybe for some reason it hasn't. I have had some Cummins engines years back that needed a forced regen even tho they got highway time. Low power, smoke, and your eyes would burn like crazy from the bs. Not saying that is 100% your problem buy it doesn't hurt to try before taking it somewhere or starting to throw parts at it.

 

The thing about the conversion is there are different kits available depending on engine serial number, CCOS number, and wether or not the valve cover is baffled some kits require to change the ECM, you really have to have a dealer check it, and like I said some serial numbers are not eligible, if you can send me the last 8 of the vin I can check if that ESN is eligible

 

That ESN is eligible, check to see if it has been done coked turbos and CAC system can cause the issue that you are having.

 

If you see black smoke, your DPF is toast. Some black smoke is normal at hard acceleration, you just don't see it much anymore because of DPFs. Are you still experiencing low power?