Yet another regen question
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Yet another regen question
I use the SCAN Gauge II to monitor my EG1, EG4, GPL, and regen status, and on my way to work today I noticed the GPL was at 3.56 when I got there. Since my truck usually starts a regen anywhere from 3.6 to 3.8GPL I figured it would do a regen on the way home.
For some strange reason I decided to go to lunch today and sure enough on my way back the truck started a regen at around 3.65GPL and of course it only got about 5-6 miles into the regen when I got back to work and stopped. I checked the GPL and EG4 when I stopped and they read 2.49GPL and 1230Deg respectively.
When I left work (around 4 hours later) the GPL still read 2.49 but as I drove home it began to drop and by the time I got home it had dropped to 1.87. The regen was off and the highest EG4 got was about 572Deg.
Any idea why this occurred?
Could the residual heat in the DPL had continued to burn the soot after I shut the truck off and just began blowing it out while I drove?
I thought I had a basic understanding how this worked until today.
Curt
For some strange reason I decided to go to lunch today and sure enough on my way back the truck started a regen at around 3.65GPL and of course it only got about 5-6 miles into the regen when I got back to work and stopped. I checked the GPL and EG4 when I stopped and they read 2.49GPL and 1230Deg respectively.
When I left work (around 4 hours later) the GPL still read 2.49 but as I drove home it began to drop and by the time I got home it had dropped to 1.87. The regen was off and the highest EG4 got was about 572Deg.
Any idea why this occurred?
Could the residual heat in the DPL had continued to burn the soot after I shut the truck off and just began blowing it out while I drove?
I thought I had a basic understanding how this worked until today.
Curt
Mountain Pass
Joined: Dec 2015
Posts: 128
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From: N. IL
I think that you hit the nail on the head, the heat that is in the system does burn off more soot after shutdown. I've had the exact same thing happen to me and have noticed that the soot level has gone down after shutdown as well.
I also have the DPF % screen enabled, so along with that and the scanner, I can see that the Regen stops at say, 25%, but after a few more miles it will go down another 5%. So it must use that residual heat to finish burning off more soot and cleaning it out than we realize.
Dave
I also have the DPF % screen enabled, so along with that and the scanner, I can see that the Regen stops at say, 25%, but after a few more miles it will go down another 5%. So it must use that residual heat to finish burning off more soot and cleaning it out than we realize.
Dave
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Well if that's the case, I don't feel as bad about having to shut down in the middle of a regen.
I case I never paid that much attention in the past about what happens if I shut down during a regen.
I case I never paid that much attention in the past about what happens if I shut down during a regen.
Post Fiend
Joined: Nov 2001
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From: Tallassee, ALabama
For the most part, shutting off during a regen, at the beginning, middle or almost finished should not cause any problems. If the regen at the beginning and didn't get the DPF hot enough, it will start a regen soon after you start driving again. If in the middles, the residual heat when you shutdown will burn more of the soot and lower the gpl. This and the almost finished regen, might cause the PCM might cause the next regen to begin sooner than usual so a complete regen can be accomplished.
If you get any message about the DPF on the center display about the exhaust filter being full or over loaded, you should try to drive enough to reduce the soot so you do not cause permanent damage to the DPF and shorten its life. The DPF is considered a consumable and not replaceable under warranty.
If you get any message about the DPF on the center display about the exhaust filter being full or over loaded, you should try to drive enough to reduce the soot so you do not cause permanent damage to the DPF and shorten its life. The DPF is considered a consumable and not replaceable under warranty.
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