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platinum307

How is it going everyone? I have an ISX cm2450 T&D. Since the tune I have had missfire codes. When I run the injector test it all passes. The code description identifies that the ecm is watching the exhaust pressure sensor for pressure pulses and sets missfires for a pulse being missing or weak.
Other then blocking the codes (bad idea) im not sure what to look for. If you have any suggestions or have seen it, some help would be appreciated.

mikkhh

since the tune. . .

Has Rawze looked at the programming to ensure it is 100% correct?.

If not, then it looks like you answered the question why.
Could likely be timing advanced to oblivion and other engine butchering done?.

Have the programming pulled and looked over:

https://rawze.com/forums/showthread.php?...5#pid72945

Rawze

(Yesterday )platinum307 Wrote: How is it going everyone? I have an ISX cm2450 T&D. Since the tune I have had missfire codes. When I run the injector test it all passes. The code description identifies that the ecm is watching the exhaust pressure sensor for pressure pulses and sets missfires for a pulse being missing or weak.
Other then blocking the codes (bad idea) im not sure what to look for. If you have any suggestions or have seen it, some help would be appreciated.

== It could be bad or improper de-mandate programming.

== It could be an after-garbage exhaust BP sensor like Dorman or others, (not genuine OEM).
info: https://rawze.com/forums/showthread.php?...5#pid72945

== It could be improper hardware changes or alterations during the de-mandate.
info: https://rawze.com/forums/showthread.php?...3#pid86303

== It could also be a legitimate issue with the engine or its injectors.

Start with the programming...
If I have not looked at the programming in detail of what someone has done.. then that is the place to start. No sense in running engine killing programming and chasing ghosts with questionable ecu trash. Copy program from the ECM via CT and e-mail it to me for a review of what someone did in there.

Also ensure the exhaust bp(back-pressure) sensor is NEW,.. that it is OEM branded, and that the feed tube and circuit going to it is VERY CLEAN / 100% soot and carbon free.

The other things I mentioned above should be looked at in detail as well.