'18 F-350 downloaded the %DPF screen. Mostly short drives with the truck and the occasional long trips with the 16k T-Hauler. Only have 4k miles on it.

So I was waiting for the screen to go to 100% to regen after the download. It started the regen 2/3 into my trip got down to 70% by the time I got to my destination. The return ride (> 1 hour) I thought it would continue with the regen. It started at 70% and worked its way back up to 85% by the time I got home. Now I'm slowly watching it get back up to 100%.

At this rate I don't think I'll ever get to 0% until my trip south this fall. Also haven't noticed much of a change in the def fluid buring the 30% it came down.

Normal ? The percentage rate it was falling I probably would have had to drive it for another hour to reach 0%.

 

More DEF fluid is used when towing, fewer regens.

Driving empty, more regens, less def fluid used.

Some report that the % of soot never goes to zero when doing an active regen, even if they know it completed.

Mine will go to 100% then regen and go all the way to zero. Mine will also NOT regen very often due to towing Sometimes I might go well over 2K miles between.

You have to learn what yours does, you will soon and then when something is off you will be able to tell.

 

This is normal, especially for short drives. It also won't necessary reach 0% on empty long trips either.
For my 2011, 1.12 soot gpl was 7% DPF load. 2014 and older < 1.20 soot gpl was normal. A normal active regeneration post 2015 update for my truck would end around 1.35 soot gpl and the residual heat would take it down to +/- 1.30 gpl.
An active regen would begin at 2.55 soot gpl. If a short drive burned down to 2.20 gpl for example, the next drive wouldn't start an AR because it was below the threshold.

 

For some reason I was under they impression that the DEF was used to clean the filter.

So when these trucks go into regen, how does the system work ? Is there a fuel inj. the sprays diesel into the filter, along with the filter heater ?

Ford must have done some interesting engineering, doesn't seem to hurt the truck if you interupt the regen process. Also probably pointless to let the truck sit there and idle if its doing a regen as it probably will stop the process if your not driving it.

Yah still learning how this works, appreciate your patience and feedback.
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The def is sprayed to control the NOX and turn into harmless water vapor. Your nox is increased with higher temps so that is when it is used most.

 

My 2015 would not go below 20% for a long time. Then for the last several regenerations it would not go below 40% when done. I was dropping down out of the mountains a couple of days ago dragging the toy hauler back towards Denver. Just before the regen. started I had been in 4th gear with the exhaust brake on. Due to the traffic, I ended up staying in 4th gear almost all the way home. When I looked at the % full it was actually saying 0. I can't say I have ever seen that.

 

DEF (SCR) and DPF are two technologies.

First picture is the pickup exhaust (DPF is last).

The second picture is more detailed but for the cab and chassis, which is different than our pickup models (DPF is first instead of last).
Edit: actualy the DPF is in the correct order...

 

The injectors on the driver side bank of cylinders (5-6-7-8) inject extra fuel during the exhaust stroke. This is why some fuel makes it to the oil plan. The more hard pulling and highway the truck does, the less fuel in oil is a concern. The more empty and city driving, the more fuel that'll end up in the oil.

Park or Neutral for more than 10 seconds stops an active regeneration. If temps are above 1,000°F on EGT14 (post DPF), an AR will not begin again if it is below the soot gpl threshold if placed into drive but it'll continue to burn off soot for a few additional miles.
Idling doesn't help much, only if you have high idle but then you're still burning fuel at 0 MPH anyways.

 

Did some googling the one thread indicated the inj was in the exhaust ? I thought they got away from the over fueling the cylinders with all the problems from the 6.4 days.

You would have to drive the truck for several hours to get a full regen it seems, the time it takes to get hot than to 100% dpf full to start the process which could than take another 40 min. if your above 30mph iirc. not filling up for gas etc. Suprised there isn't more dpf issues with people living in cities driving these trucks, when would it ever regen ? I guess the good thing is it doesn't have to go to zero to still be functional.

So far I haven't been really driving the truck on short trips for fear of dpf issues. Getting tired of riding my bicycle lol.

Appreciate all the info.

 

Your reading too much into this.

My 2015 with 52K on it regens and I have never seen mine go lower than 15%. It usually stops at the 20% mark. Once it is up to normal operating temp, and the display shows "exhaust filter full", I can complete a regen anywhere from 15-20 miles. If you interrupt enough cycles, you will get the "drive to clean" message. Then head to the freeway and go for a nice little 20 mile drive.

My advice? Drive the truck and put the bike back in the garage.

 

Not for the 6.7L Ford. The GM LML has a "ninth injector" pre DOC.

Do not fear DPF issues. Yes, city driving produces more soot which means more regular active regeneration's and (long term) only city driving will cause the DPF to plug early (not the "designed" 250,000 miles if I'm remembering that number correctly) but these 2011MY+ "emissions 2.0" are not massively failing. Yes, there is a reason why city/utility service trucks are using the 6.2L but it's a lot of idling and short trips.

Active regeneration is +/- 15 minutes depending on speed.

If you like data monitoring, monitor but don't allow it to interrupt you much. If you find the knowledge causes you to worry about it, stop monitoring and let the truck programming do what it was designed to do.
If the AR's have been interrupted too many times, you'll get a "drive to clean exhaust" message and that's what you'll need to do.

If your daily driving is only < two miles each way, possibly the 6.7L truck isn't the best option every day but drive it when you feel like it and monitor.
I daily drove my truck for eight years until two months ago. Work week driving with lunch if I didn't do anything additional is 40 miles /day. I can't hide that I've had issues but issues aren't because I didn't occasionally complete an AR over time. I knew when I had several interrupted so I would simply take a longer route home to ensure the regeneration had a few extra miles to complete.

The EcoBoost isn't designed for long term short trips either due to the potential for carbon build up.

 

If I'm understanding things right, Ford changed the programming of the regen to inject fuel on both sides, but that was a post-release change for the pre-2017 models. Injection on only on side was causing "jack hammering" (there is a thread by that very name). The 2017+ uses the new method of injection. My regens are very smooth. If I wasn't watching the DPF% screen I wouldn't know a regen was happening.

 

I did not know that big of a change occurred on the 6.7L for 2017+. The 6.7L coffee table book hasn't been updated. Anyone know of some updated Ford documentation?

 

Thanks Fella's I was JJ about the bike and I'm not stressed over it. I pull a 17k fifth wheel and D5 dozer which is the main reason I bought the truck. I do however lean on my 6.0 for short trips (that I haven't had been able to part with, to much time and money spend over the last 10 years it hardly seems worth selling now that it runs so well). I should start driving it more.

I've been monitoring this site for the last year to make sure I wasn't going to run into issues. I admit there is more to this emission system than I initially thought. I do like the data monitoring, just trying to set up the forscan lite up with all of the PIDs. Ford has done a good job in making this system seemless. Anyone have a link to the PID tables for IOS ?

I'm sure I'm like many, want to keep the truck and all the filters clean. lol