REGEN ISSUE: DOSER OR OTHER?

This has always been my way of thinking. Preventive maintenance...... replace it to always have that peace of mind.
I soon to will probably have one of these engines If CARB doesn’t grandfather us in Cali with our aftermarket DPF’s. Interesting thread, been learning about these engines. Currently running a 3406E. Best engine I ever had.

 

In my experience with a 2250 it takes about an hour for a stationary regen. You should look at the DPF in/out temps and DOC temp and the DPF differential pressure(all these show up in the aftertreatment history) Your DPF should be greater than 1000(mine gets to 1150 regularly, both in and out) my DOC is usually between 670 - 700. I had to replace both the DOC and DPF at ~640k. I made this decision after spending 1K on a 'cummins reman' DPF that didn't last 20K miles(it was plugged worse that the one I gave them for a core.) The ~7300 that I spent on new DOC and DPF was worth it and the firmware upgrade for my engine from .36 to .39 was also helpful mostly because I there's a setting in the J1939 multiplexing section for the parking brake and without that set correctly the passive regens wern't effective due to the low temps they produced.

If your DPF and DOC are plugged, regens are going to fail which it sounds like yours are, if they only take 20 minutes and requests another shortly afterwards. The dealership is NOT your friend. They have ZERO interest in actually fixing your problem especially if you're just passing through.

It also sounds like the pistons are carbon packed, only you can make the decision as to when too much is really too much. A diesel already burns oil, so there's that.

The overhead adjustment is straight forward I do it in my driveway once a year(2 torque wrenches, a couple of crowsfeet and a couple of allen keys and 3/4" cheaterbar to bar the motor over) took ~2 hours the first time(paranoid) and about 1hr the next.

Lots of great info on Rawze's site, like everyone says.

Good Luck

 

Mine...all needed replaced ..oh,every 150k it seems like.Just pointing out the "Emergency derate treatment" of hooking laptop to it and "burning it out",just was a "bandaid ".2 to 400 miles later problem returned.

 

You said you replaced the dozer. And you cleaned or replaced the dpf. The last component is the doc. The doc is $2500-$3500.

The risk you have of running it is the back pressure the exhaust puts on the turbo if everything is clogged up.

I don't think 425 miles is a big deal it's just if you get derated then you're looking at a service call to get you out of derate and then into the shop.
Cummins isn't bashful if you google their maintanace schedule you're right in the wear out period for the dpf system. There is a reason the fleets sell them at 350,000 to 500,000 miles.
Good luck.

 

Do not start throwing parts at this.
Complete and utter waste of time and money.
You need insite to be able to accuratly diagnose and fix this issue. If you dont have that it will need to go to a trusted shop.
I have no idea how this thread is on 5 pages already...

 

What aftertreatment pressure? Its not differential pressure as it maxs at 3psi or so.
Exhaust gas pressure? Aftertreatment fuel pressure?

When the temps drop is it still dosing?
Im assuming aftertreatment fuel pressure drops and so does the temp. Points to shutoff valve or fuel issues.

What is the code it throws?

 

Nox sensor has nothing to do with regens. Treat it as a seperate system.
Nox abnormal update rate can mean a faulty sensor, or an issue in the power supply or 1939.
Check for 12v on 2 of the pins for the nox sensor with key on. Get a friend to watch the 12v then go underneath and shake all the harnesses to make sure it stays at 12 and there isnt an intermittant break.
Other 2 pins should have 60 ohms key off on the datalink. Shake all the harnesses again. If the readings stay level, replace the sensor.

Any exhuast leaks?