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Discussion Starter #1
I have 2200 miles on my truck. When should it regen? I've done some towing with it, and normal driving. I have never seen any indications whatsoever, that it has done a regen. Any help?
 

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Only indication that I'm aware of is watching the fuel mileage drop (unexpected poor mileage for the way you're driving) or getting out after shutdown and noticing a burnt smell. It appears as if Ford wanted to make it a sort of non-issue type of event; one we shouldn't notice or be concerned with. David
 

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Discussion Starter #4
Oh ok. I was thinking there would be some sort of indicator on the dash or something similar, to let me know. But that's fine. Thanks for the help!
 

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My 2011 had a message pop up in the message centre but it was very brief and easy to miss. My 2017 is too new yet so don't know if it has a message or not
 

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I have yet to see a message either. 3900 miles.
 

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There is a very quick message that pops up saying that regeneration is starting (so quick I've never really noticed the exact words). As was said above, the only way you'll really know is to watch the average fuel guage drop a bit.
 

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My message center says "Cleaning Exhaust Filter" for a couple of seconds and the instantaneous fuel economy drops to half what it usually shows for about 15 miles.
 

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I believe you only get the regen message on the 2017s if your regular driving habits aren't sufficient to meet the regen requirements, at which point you're expected to keep driving until the process has completed. I have 25,000 miles on mine and have never seen the message once.
 

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Only time I have noticed anything is during extended idle periods--the RPMs will jump to 12-1300 and stay there for 10mins or so, then drop back. Never seen anything while driving in 15000 miles. Odd smell outside, also, during the high idle event.
 

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My 2018 has almost 3000 miles, and 2/3 DEF tank left. No towing yet. So, some regeneration has taken place. Once on the highway I noticed mpg dropping significantly, then coming back up. I assumed regen was taking place then. Other than that, haven't noticed it.
 

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DEF usage has nothing to do with regens. New trucks will have longer intervals for regen because they have a clean DPF.
DEF is used in the regen is it not?
 

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DEF is used in the regen is it not?
Nope. Diesel is used to raise exhaust temps to burn out the soot from the DPF.

DEF is used only as a source of ammonia to reduce NOX in the catalytic converter.

There may be a slight increase in DEF usage during a regen, but only because the extra fuel burn could be producing more NOX.
 

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DEF is used in the regen is it not?
Nope. Diesel is used to raise exhaust temps to burn out the soot from the DPF.

DEF is used only as a source of ammonia to reduce NOX in the catalytic converter.

There may be a slight increase in DEF usage during a regen, but only because the extra fuel burn could be producing more NOX.
Thanks for the lesson. I didn’t know that.
Can you describe how the diesel is used to raise exhaust temps?
 

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Unless they've changed things, Ford uses the passenger side injectors to squirt a little extra during the exhaust stroke. GM used a 9th injector to squirt diesel directly into the exhaust stream.

There's plenty of oxygen in the exhaust, so it burns when it hits the hot catalyst.
 

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Did some research prior to purchasing the current rig, 2018 6.7, and it was my understanding that the DPF was "cleaned" by injecting diesel and raising the exhaust temperature to accomplish that. Cleaning the DPF raised NOx emissions via increased heating (I think that's right) and so the DEF was injected post DPF to reduce exhaust temps (and so NOx emissions). Maybe I've got it right......anyway...

School me if my interpretation is incorrect.....

I believed there was a relation between DPF regens and DEF usage.
 
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