I'm working on a 2014 Mack pinnacle we are having regen problems cannot get exh temp high enough only get to 300 deg. We replaced pdf filter doser injector dower module and air pressure regulator and air dryer and fuel filters. Mack said dryer when old has particles in air and harms dower module. No codes active or inactive. All test passed. No exh leaks. When in regen mode engine starts to stumble when coolant temp reaches 175 deg. When at idle engine idles smooth. But when you press the throttle it sounds like the engine is loaded up then smokes then clears out. Anyone have any suggestion.
