Regen Resume

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Aug 12, 2014 | 05:54 PM

Dascro58

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Mountain Pass

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Regen Resume

I'm wondering if the regen cycle on my 2015 may actually resume if interrupted (engine shut-off and then restarted at a later time)?

I can't find anything to that effect in the Diesel Supplement (or in my reading here and on other forums) but it seems (no Edge CTS, just observation) that it may be doing that. Course I could be wrong!!

Any insight as to if this is even possible?

Thanks,
Dave

Aug 12, 2014 | 06:13 PM

Romeo Scorpion

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If you had an Edge CTS or some other device to monitor the DPF soot level, you'd see that a regen starts when the DPF soot count hits about 2.67. Very shortly thereafter the soot count begins to drop. If the regen cycle makes it to completion, the count will get down to somewhere between 1.00 to 1.30. If you interrupt the regen cycle at anything less than 2.67, let's say 2.55, the regen process won't start again until the soot count gets back up to 2.67.

There are some variables that could cause the regen to begin at a lesser count, such as lots of miles driven under a heavy load that keeps the soot count below 2.67, but the above is what you can normally expect to see.

Aug 12, 2014 | 06:22 PM

Dascro58

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Mountain Pass

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Thanks Matt. Very helpful. Looks like an Edge CTS is in my future.

Dave

Aug 12, 2014 | 07:19 PM

Lastwagen

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From: San Marcos, TX

If you do a lot of short trips as I do, then yes the regen cycle will be interrupted prior to completion. Once in this "loop" of incomplete cycles you can either drive until it completes a regen or use the CTS to do a manual regen. The manual regen is much more thorough as it can take the soot count down to as low as .30. After which it will rapidly climb back to 1.50 and above but does not build up to the threshold of 2.67 for some time. I do a manual regen about once a week. It's best to start a manual regen after the engine has reached operating temps. I start the process in the morning when I get to the office. It will run at 2k rpm for about 8-10 minutes and then throttle down to idle at which time the soot level is around 1.30 or lower. At this time EGT 4 is still above 1000 and still burning soot so let it idle for another 5-10 minutes while the engine cools down and the soot level continues to drop. IMO it is better than driving just to complete a cycle as it is definitely more thorough and you're not wasting time putting on more miles. I open the hood as recommended but doubt that it matters much. Note that it is a loud and noisy process so you want to be considerate of your neighbors.

Aug 13, 2014 | 06:00 AM

Dascro58

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Mountain Pass

Joined: Jun 2010

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Lastwagen,

Thanks for your reply. What do you consider "short trips" and also what do you consider "a lot" of them?

I drive about 12 miles to work each way every day. And one very short trip mid day.

Dave

Aug 13, 2014 | 06:20 AM

Lastwagen

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Joined: Feb 2012

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From: San Marcos, TX

Quote:

Originally Posted by Dascro58

I drive 3 mi to work and back home. During the day maybe 4 to 10 runs around town most of which are less than 5 mi.

The exact distance doesn't mean much. No matter how far you drive, if you cut a regen short then it will soon start another. If you don't monitor with a CTS or other then you wouldn't know where the soot level is and until you see the "cleaning exhaust filter" on the display you wouldn't know. Frequent regens will definitely lower fuel mileage.

Aug 13, 2014 | 12:11 PM

MPD56

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Joined: Jan 2008

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Lastwagen:

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Great information. I have a 2013 with a <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com

3:31</st1:time> rear end. Driving around town or even on the highway empty my EGTS don’t get high enough to perform a Passive Regen so Soot will increase. If I find my Soot % is high enough and I know I’m going to have to stop and park, I lock out gears to increase the EGTS so that the Soot doesn’t increase and an Active Regen doesn’t start and hope on my next trip it will start and I can complete it.