DD15 emissions system maintenance

[Bengy88]

(07-19-2022 )Rawze Wrote:  

(07-19-2022 )Bengy88 Wrote:  ... There isn’t gonna be a common go to or just cleaning a bunch of stuff that’s gonna fix your problem
...

That is not really true.. MANY OF THE EMISSIONS SYSTEMS PROBLEMS on ALL BRANDS OF ENGINES are from the engine. The engine makes the soot, not the exhaust-cans. The engine is what creates most all the things that the emissions systems complain about.

An EGR tune-up will do one some wonders. Ya just have to take things apart and clean them out, replace old sensors that read wrong, etc. - That is the place to start with it every couple years or so. It is not that different from the red engines.. the EGR circuits get dirty, clogged, and the sensors read wrong after half a million miles of neglect.. it is that simple.

Also, that after-treatment system was designed by cummins. The NOx sensors, although slightly different will suffer from the same fate as they do on cummins engines. - they will start to read incorrectly and get weak after 250k miles or so.. and then the system complains all the time.

As well.. the SCR can loose its potency if any sort of moisture has gone thru it, washing it out of precious metals, etc. They get weak no matter what over time due to this, just from condensation, etc.. so also, ensure there is no coolant seeping from the engine or egr cooler, etc.. that can make the problems worse.

I agree that the egr systems need to be cleaned on every engine and that soot does build up in every engine, and the engine does create 80% of problems with the aftertreatment side. All I was saying is chances are that he will not just go to his engine and start cleaning things and fix his problem. He might fix what caused his problem, and he definitely will prevent future problems. I doubt cleaning the egr system will repair a bad temp sensor, a leaking def doser, or contaminated def. Also These engines give a lot of injector and egr valve issues, even a few one box issues that just programming will fix. All I’m saying is you can clean all you want but even if there is a problem that cleaning will fix you still need to know what was damaged and causing the service aftertreatment message. Without dddl, or even jpro or nexiq etechnician you are fighting a ghost just like with any other engine. In my opinion it’s always easier to find what’s damaged and then what caused the damage. It’s crazy to look for what caused the damage without even knowing what’s damaged.