I have a 2014 F350 with 70k miles on it. This truck is typically only driven on the highway or when towing. I have another vehicle for driving around town. The last couple times I've had it on the highway it will finish a Regen and then within 5-10 minutes of finishing it jumps from 0% full to 20-30% full. Today I drove it out to a friend's house about 20 minutes away up the highway, it regened while driving up there and was at 0%. I hooked up to an empty 7x14 dump trailer, pulled it 15 minutes up the highway to the rock pit, put 1 ton of sand in the trailer and drove 5 minutes to my house and it was at 95% full by the time I got home.

The next day I unhooked the trailer and had to run a couple errands with the truck for the project I was working on and it went into Regen again so I drove up a local state road with a decent climb to put the motor under load for the Regen and it only dropped to 10% complete and then kicked out of Regen and had climbed back up to 25% when I pulled in the driveway. The following day I took the empty dump trailer back to my buddies house and it was up to 45% full when I got back home.

Would this be a symptom of a plugging/failing dpf or a pressure differential sensor? Or? Any ideas on where I can start diagnosing this would be helpful.

 

most likely is it a pressure differential or check the EGT sensors too.

Need to have something that can read live data.

 

That's impressive for a older truck to regen down to 0% but it makes sense because it only has 70k miles and you work it by hauling heavy loads...

I'd look at the DPF pressure sensor(s).. I cannot remember if the 14s got a second sensor but my truck has a pre DPF sensor and post DPF sensor.. go look at the Coffee book PDF in the tech section pinned on top of the forum.

 

I have a scanner that will display a live data stream. What parameters would I need to be looking at?

 

I will have to take a look at that. Thanks for pointing me towards that.

 

How old are the map and egr sensors since last replaced.

 

As far as I know they have never been replaced.

 

start with reading all EGT sensors at cold ambient temps and see if you can identify one that is off.

 

I was told a dirty/plugged MAP sensor can cause this condition as well, true??

FWIW, my 2015 since new will usually only regen down to about 20-30% depending on driving conditions, and will only go to 10-15% with a static regen, 127K miles later, and still the same.

 

My 16 has 127k miles... when the truck was newer, it would regen lower than it does now, to 10 to 15%. Now i usually see anywhere from 25% to 40%. I climb an expressway with a few pretty long hill climbs when I do regens. Just did a static regen withy iDash, dash at 85%, got down to 10% when it completed. Truck was at 5% the next day but jumped to 10% pretty quick once I started to drive the next day.

Not sure on the MAP sensor though...