Bought demandated isx, issues tune related??

[Rawze]

(09-28-2025 )BarelyAbleFarms Wrote:  

(09-28-2025 )Rawze Wrote:  ...
Being it is a CM870 ... you can always have the programming flashed back to 100% factory and unplug the EGR temp sensor.. putting the ecm into its it in non-egr operating mode that way. CEL (check engine light) will be on and it will have a slight boost derate but not a power derate (boost will go to 36 or so then drop back to 32 and hold). Then run it like that, at least it will be safe, until you figure out its other issues.

...
By factory, I would have to remove the ECU and take to the dealer? That might be an option I would consider. I would like to know the truck is safe to run and that would be a good step. Harvest is here and I need the truck to haul

yup.

[Rawze]

(10-05-2025 )Shaman870 Wrote:  Try to clean up exhaust pressure sensor line itself: remove that sensor and blow some air where it was. There is a small diameter metal tube that provides pressure data from exhaust, if its clogged, it may affect smoothness of the rpm, depends on de-mandating "style".

FYI: The exhaust gas pressure corssover tube itself hardly ever clogs up.. its the passageway thru the thermostat housing, directly below the sensor that almost always does.

[Aleeex]

whats your location?

[BarelyAbleFarms]

(10-05-2025 )Shaman870 Wrote:  Try to clean up exhaust pressure sensor line itself: remove that sensor and blow some air where it was. There is a small diameter metal tube that provides pressure data from exhaust, if its clogged, it may affect smoothness of the rpm, depends on de-mandating "style".

I appreciate the tip. I did blow air down the hole where the sensor goes, when I was installing the new sensor. I was getting the short to ground code and that's why I went ahead and replaced the sensor. Air seemed to flow thru without much restriction.

[BarelyAbleFarms]

(Yesterday )Aleeex Wrote:  whats your location?

I'm in Northwest Indiana, not far from Michigan