black smoking cm870

[Lonestar10]

if the engine wasnt tuned here its most likely the tune. but could be EGR if not plugged has opened, if still has VGT but its held full open then well the thing will run like garbage, the 870 is a whole other ballgame to tune compared to cm871 and newer, if jammed means it has a whole other turbo non VGT then the engine is probably even more fouled up because the bonebags that call them selves tuners out there are nothing more than copy paste trash tune artists. last truck i looked at before was tuned showed 740k on the odo after the tune it now has 420k....obviously tune was pulled from another truck then put into his with no consideration if they were even the same CPL numbers, also he was told it was set for 600/2050 after rawze calculated it was more like 750 and idk on torque plus the vgt had no idea how to control itself, the shop that did it charged him 5,000 for their hackery i fixed him up with a bit of help in 20minutes for free since the dpf was empty and their were blocker plates on EGR.

almost every "Tuned" truck ive ran into that wasnt tuned by a tuner not from this forum has nothing but issue after issue and catastrophic failures.