Weird regen-thoughts?
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Senior User
Joined: Mar 2007
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From: Anchorage, Alaska
Weird regen-thoughts?
Ok, so I’ve been driving my truck in town the last few months and haven’t gotten a good regen, so I’ve been waiting for this trip to put her through her paces. I left yesterday for a long trip and my dpf screen showed 50%. I drove all day yesterday and was at 65% last night. I then drove today and the truck was at 75% and the truck went into regen. I figured it was due to mileage, as it was about 500 miles since the last regen. It was in regen for a long time (like 10 minutes) before it went down off of 75%. It stopped when it got to 60%. I then drove another 350 miles and it is at 65% when I shut it down. It’s like the dpf screen isn’t showing the right percentage. Kind of weird.
other notables on the drive. I’m flat towing a 5500 lb jeep. The terrain is relatively flat without big hills. I’m cruising at 50-60 mph. Oh, and it’s cold. The temps today were between -7 and -31. Not sure if these impact it, but those are the only variables.
Thoughts? I’m not really concerned, but more curious.
other notables on the drive. I’m flat towing a 5500 lb jeep. The terrain is relatively flat without big hills. I’m cruising at 50-60 mph. Oh, and it’s cold. The temps today were between -7 and -31. Not sure if these impact it, but those are the only variables.
Thoughts? I’m not really concerned, but more curious.
Lead Driver
Joined: Jan 2010
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What were the temps for your post DPF EGT sensor? If it did start an active regeneration, my guess is the cold temperature having an effect. It would have taken several extra minutes to get EGT4 to > 1000°F (if at all) and the PCM would have completed the AR cycle before being too effective.
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Senior User
Joined: Mar 2007
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From: Anchorage, Alaska
I believe it was an active regen as the light came on and it acted like a full regen. Guess I’m not sure if the differences. The more I think about it, I think it had to be the cold playing a factor. Temps that low at highway speed make it tough to get to temps.
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Senior User
Joined: Mar 2007
Posts: 373
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From: Anchorage, Alaska
What were the temps for your post DPF EGT sensor? If it did start an active regeneration, my guess is the cold temperature having an effect. It would have taken several extra minutes to get EGT4 to > 1000°F (if at all) and the PCM would have completed the AR cycle before being too effective.
I don’t know the temps. I wasn’t running my sct. I agree on the temps. It is the only thing I can think of.
Cargo Master
Joined: Feb 2008
Posts: 2,862
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From: Tooele, UT
One thing I noticed with my truck is when the temps get into the mid 20s the soot accumulation in my dpf goes way down. When it is over 30 degrees I gain over 10% each way on my trip to and from work. When in the mid 20s I'll gain only 5% round trip.
Posting Guru
Joined: Aug 2007
Posts: 1,902
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From: BA, OK
I noticed similar results on my truck this week. During a 2000 mile trip @80mph not towing truck would regen every 450-500 miles. dpf percent screen showed many different percentages prior to an active regen. Majority of the time dpf percentage never made it to full. I was using Torque Pro to monitor when regen was off or on. I have a gauge for soot% enabled and it was always low (less than 60%) between regens. It also showed negative soot percentages before regen completed. Haven't got all the sensors enabled yet, still learning the app.
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rywegh
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Jan 12, 2009 10:34 AM
