Maxxforce 13 DPF/Regen related questions

How many Miles on it? They need to be removed and cleaned or replaced every so often (Miles).

 

I'm not a mechanic but I've run the MaxForce with DPF in the past, and would say yes those symptoms coupled with the mileage are indicative of needed service to the DPF.

 

Your truck is running normally and healthy. It's doing what it is supposed to do. Passive regens are normally happening a couple times a day. If one finishes, and then an hour later it has to do another, then there is a problem. If you get asked to perform a parked regen, then the system cannot keep up. You cannot start a parked regen if the system is not asking for one. One per day or one every other day is how the system works. All your temps and percentages of starting and ending are normal.

 

No problem. Yes, Maxxforce is nothing but a nightmare and total extinction is just a matter of time.

 

Apologies for bumping an old thread but this is the closest I see in my question doesn't seem important enough to base a threat around.
My truck with the maxxforce 13 has been asking for parked Regens. But the DPF light will only stay on for about 10 minutes so by the time I actually get to an exit to get off the highway it's gone and won't let me do one.
Is that at all normal? Should it give me more time to get pulled over to do one or does this mean that maybe it did a regen cycle and it's okay?

 

When it is requesting one, that means it cannot do one on it's own. Unless you are city traffic stop and go all day, this is the early signs of problems that it can no longer keep up with itself. So no, not normal. If you are already on the highway, that is the best condition for automatic regens, so if you are getting parked requests at this time, something is not right.

 

Ok so we have a maxxforce 13 in one of our trucks that is having issues with regens. The driver stated he had to do 2 regens within an hour apart of each other and it was still requesting to do another parked regen. When we finally got our hands on it, the soot load was pretty high, so we forced a regen and looked at the specs on NED to see what was going on. Found out that the doser wasn't dosing. Took it out and it was caked up so we just went ahead and replaced the doser. Ran another regen and was still not dosing. We also noticed the "AFT Fuel Pressure 2" sensor was reading zero the whole time. Tried to get that sensor ordered, but of coarse International doesn't sell the sensor by itself, so we replaced the whole "Down Stream Injection" unit (aka metering unit). Installed the DSI unit and ran a force regen. We noticed that the AFT Fuel Shutoff CTL stays on "enable" and doesn't let the doser dose. In the beginning of the regen, it will be on "disable" until AFT Fuel Pressure 1 gets up to about 116psi, the doser opens about 30% for a split second and then the AFT Fuel Shutoff CTL kicks over to "enable" and doesn't let the injector dose. I know there is still an issue because all 3 after treatment temp sensors get up to 580 degrees Fahrenheit maximum. Any thoughts on why the AFT Fuel Shutoff CTL stays in "enable" and doesn't allow the injector doser to dose?

BTW, the AFT Fuel Pressure 2 does give us a reading now and varies between 0 and about 40psi.

Thanks