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Duramax Fifth Generation: 2011-2016 (LML) Discuss the fifth generation (2011-2016) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 03-14-2019, 09:26 PM   #11 (permalink)
LMLJeepHauler
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A regen shouldn't kill mileage that bad or last that long. I drive around town mostly and am done with regen in under 30 min, it also doesn't affect my fuel mileage in any way I can tell. No way should it be lasting 100-150 miles. Do you have an Edge monitor? You'd be able to see whats going on.

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Old 03-14-2019, 09:57 PM   #12 (permalink)
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Quote:
Originally Posted by LMLJeepHauler View Post
A regen shouldn't kill mileage that bad or last that long. I drive around town mostly and am done with regen in under 30 min, it also doesn't affect my fuel mileage in any way I can tell. No way should it be lasting 100-150 miles. Do you have an Edge monitor? You'd be able to see whats going on.
First off, yes, regen does affect mileage a lot. And hes not saying, nor am I implying that the regen is lasting that long, he just said that it takes that long for the mileage to climb again.

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Old 03-15-2019, 11:33 AM   #13 (permalink)
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Originally Posted by TobyIgo View Post
After reading your comment, I looked up regen cycles and now I recall my truck going through an announced regen cycle back in the fall. By announced, I mean the computer lit up my dash and let me know what was going on. I drove several hundred miles before this finally cleared from the dash.

So it is possible I'm going through some sort of unannounced regen cycle? Meaning, perhaps the soot buildup in the DPF isn't bad enough to kick in the computer to conduct a full-on regen cycle and my truck and mileage are just suffering the consequences??? I've also read about putting on a bypass filter to help with soot and reduction in the DPF. This mess really sucks because I put the cold air intake on to get better performance, but every 400-500 miles, the gains in fuel efficiency are completely lost.
dig out and read the diesel suppliment in your owners manual. it goes into great detail about the regen cycle, when you will get warnings, when you won't, what to do if a warning come up etc.
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Old 03-15-2019, 12:47 PM   #14 (permalink)
redwngr
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Originally Posted by TobyIgo View Post
YES! Exactly, about every 400-500, getting great mileage, then the bottom drops out for 100-150 miles, then it picks back up again for another 400-500 miles. So what do I do to stop this regen cycle?
If you reset the mileage frequently enough you should find that the fuel economy drops (the regen lasts) for about 30 minutes/miles at highway speed.


The rest is just the way averages work, and 'recovery' miles will depend on how many miles were accumulated in the fuel mileage average before the regen started.

It was so much easier to see when they had the 'instantaneous' fuel economy display.
(which has returned in the dash/dic with the updated body style)



And yes, 500 -700 miles is pretty common for LML. (so 400-500 doesn't necessarily mean a problem, depending on how the truck is used)

And no, it will not give notice that it is in regen, unless it has had a problem completing regen over multiple attempts.

And no, there is no reason to 'keep driving' during regen, unless it asks you to. Regen will resume when the speed and exhaust temp is again high enough for it to continue.


Air filter info:
https://nicoclub.com/archives/kn-vs-oem-filter.html
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Last edited by redwngr; 03-15-2019 at 12:57 PM.
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