ISX cm2250 emissions help needed

[Rawze]

3375 - DPF regen too frequent.

3376 - DPF Incomplete regen.


3375 and 3376 are both codes for the DPF being clogged, but they can also occur due to other exhaust restrictions too.

* The SCR can clogged will trigger these same alarms. You said someone "fixed" the SCR can instead of replacing it. What does the face of it look like now, after several months? -- Those SCR cans, even if they have a little bit of soot, etc. in the face or in them will cause all kinds of exhaust restrictions. -- Since there is no sensor for this,.. It throws DPF alarms, because the DPF differential press sensor ALSO reports the pressure and/or restrictions along with the difference pressure.

* You claimed it had a bad EGR cooler,.. -- THAT ALONE! can and will cause the DOC to go bad,.. the DPF to possibly go bad,.. AND DEFINITELY the SCR can to go bad and get restricted!.


From what you posted, I see several mistakes...

* Trying to repair the SCR can after it got contaminated instead of replacing it. -- Maybe you got away with it for a while,.. but it certainly sounds like it may have now caught up to the fact.

* Ignoring the fact that an EGR cooler failure CAN AND WILL destroy those components in a hurry, and NOT replacing them, but instead, trying to nurse them back to life to save a few bucks. -- No harm in trying, but then don't go around wondering why you are having repeating problems.

* You never mentioned anything about the decomp tube, or if it has been checked for a "Volcano" --> http://rawze.com/forums/showthread.php?t...07#pid1807

* You never mentioned the state of the engine, other than to say it isn't making a lot of soot. (leaky injecotr(s) or rail, intake and/or egr leaks or restrictions, EGR valve health, etc.


* you never mentioned what the regen history looked like, nor what the numbers were after a regen.

* the truck has an INSANELY HIGH amount of idle time on it compared to the mileage. This is bad for the whole emissions system on those trucks, and requires more frequent preventative maintenance and regular forced regen cycles,.. this ultimately shorten the life of all those components anyways.


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I do not have engine E.S.P. -- but it sounds like you are running in circles and getting not much of anywhere, when you should take a step back and look at the bigger picture(s).