Isx 2350 help please!?

[Rawze]

(10-31-2020 )Dynogt17 Wrote:  I have an Isx 2350 2013 in a 2014 386 peterbilt. My regens are getting more frequent. It'll regen properly 1000+ degrees today, tomorrow itll start a active regen when i come to a stop light. no change in temperature from what its been running lately which has been 550f degrees to 700f degrees on inlet & outlet temps. The next day itll regen properly again. When its in a active regen with 550f- 700f degs the truck hesitates to 1000rpm then itll shoot to 1200rpm and chuff hesitation stops. Im losing boost 27 to 28psi max, & truck is sluggish.

New in last year.
Batterys
Dpf pressure sensor
Dpf & doc blown out with air cleaning
New fuel 7th injector replaced
Backpressue, egr delta p, imap all 50k miles old
New scr 120k miles
New def doser 120k miles
New nox sensor 120k miles

Could this be a bad doc or dpf? Im lost im trying not to delete it!

The numbers on the far right show there is something borderline wrong with it. An average of 3.0 (not accounting for the parked regen) is considered a bit high and causes fuel mileage loss and leads to more than normal soot from the engine.

* I would normally say to also do a thourough EGR tune-up and replacing the IMAP sensor + Delta-P, etc. if they are more than a year old. Regen issues are engine/egr problems. The DPF does not make soot, it collects it. Looks like you covered some of that already, that is good.

If it is cuffing, that is a serious issue too and will destroy/severely shorten the life of the turbocharger. That needs to be fixed asap and its likely due to bad or clogged up EGR pressure, bad or clogged up exhaust pressure sensor (or its feed circuit inside the thermostat housing / exhasut tube form the manifold), or the culprit is the EGR cooler packed with carbon, not enough flow thru it, and needs to be cleaned out.

Also you want to ensure the software is up to date. Older ecm software was more sensitive to egr issues and made the turbo over-spool like that and chuff. Also that no one has put a different program in the engine to up the horsepower. If they did it incorrectly, it can lead to the issues you describe and/or regen problems.