Regen Issues
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New User
Joined: Jun 2010
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Regen Issues
I've had my truck for 3 years now and recently the regen process has changed dramatically. Until about 2 months ago the truck would regen approx wvery 300miles and take about 20-25miles to do so. Now the truck is regen every 65-80miles and the regens are only lasting 8-9miles. This is not acceptable as its killing the already poor milelage. I realize i'm gonna need to take it to dealer, but was wondering what some of the experts think it might be cause I'm sure I'll get the run around. 58,000mi on truck. Thanks
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New User
Joined: Jun 2010
Posts: 12
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Well at least I'm not the only one!! Problem is the dealer I bought it from is gone and dealers certainly don't want to dig into things under warrenty. I thought egbp sensor made sense, but who knows.
Tuned
Joined: Mar 2004
Posts: 380
Likes: 12
From: somewhere in Colorado
I'm not far from that either. Just need to figure out the warranty coverage issue. I bought an extended warranty so if they will not cover the truck I would want my money back.
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Mountain Pass
Joined: Sep 2008
Posts: 187
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Mine is doing the same thing, plus making oil in the crankcase. The dealer looked at it and found nothing wrong. Please let us know if your dealer is more thorough and finds a problem.
thx
thx
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Senior User
Joined: Apr 2005
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From: Anchorage, Alaska
One thing I can think of is that the DPF is starting to get clogged up. This is normal operation after many miles and many regens.
Say we have "burnable" particulates and "unburnable" particulates. The unburnable particulates get trapped in the filter and will not burn out. The burnable particulates will burn and pass through as gasses.
What is happening is that the DPF gets clogged with the unburnable particulates, which builds up over time. It is not enough to restrict flow in normal operation, but since it is partially plugged with these unburnable partculates, it leaves less room for the burnable particulates and clogs up faster. Hence the shorter interval between regens (100 miles vs. 300 miles).
Now why it burns out faster (within 10 miles or so) is because it filled up faster. You have the same rate or particulates entering the DPF in a shorter period of time, so there isn't 300 miles worth of particulate to burn out, only 100 miles worth.
The procedure for curing this is to remove and clean the DPF, or replace if damaged or uncleanable. There is a tool (a 10,000 dollar tool!) that uses compressed air to blow the particulates from the DPF.
Thats just my guess...
Say we have "burnable" particulates and "unburnable" particulates. The unburnable particulates get trapped in the filter and will not burn out. The burnable particulates will burn and pass through as gasses.
What is happening is that the DPF gets clogged with the unburnable particulates, which builds up over time. It is not enough to restrict flow in normal operation, but since it is partially plugged with these unburnable partculates, it leaves less room for the burnable particulates and clogs up faster. Hence the shorter interval between regens (100 miles vs. 300 miles).
Now why it burns out faster (within 10 miles or so) is because it filled up faster. You have the same rate or particulates entering the DPF in a shorter period of time, so there isn't 300 miles worth of particulate to burn out, only 100 miles worth.
The procedure for curing this is to remove and clean the DPF, or replace if damaged or uncleanable. There is a tool (a 10,000 dollar tool!) that uses compressed air to blow the particulates from the DPF.
Thats just my guess...
Elder User
Joined: Jan 2008
Posts: 617
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From: Washington,KS/Lincoln,NE
makes sense to have a DPF partially full with unburnables. We're only at half the mileage where DPF is supposed to have to be serviced though. Add to that the fact that this wasn't a gradual thing for me. It happened all at once. Makes it appear more probable that a sensor has gone bad.
Posting Guru
Joined: Jul 2005
Posts: 1,006
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From: San Jose, CA
I seem to remember someone who did a DPF delete in this or another forum commenting how much crud fell out of the DPF as he opened it up. I wonder if we ought to open it and use compressed air to blow it out every once in a while. Otherwise, it seems to be a near-permanent exhaust restriction that simply gets worse over time. But heck, if I took the inconvenience to drop the DPF to clean it out, I might as well just do a delete instead.
Super Moderator
Joined: Aug 2008
Posts: 37,370
Likes: 1,858
From: Frederick, MD
This has to be a sensor that is out of tollerance but not enough to throw a code.
There maybe pending codes perhaps.
Even when pulling my 5er on this last trip to Colo and back I generally regened about every 130 miles.
Empty will be alot longer.
Senior User
Joined: Apr 2005
Posts: 357
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From: Anchorage, Alaska
Yeah. Definitely makes sense if your milage is low. I'm used to our long haul truckers having complaints of short regens, but they have 2008s with pushing 300,000 or 400,000 miles right now.
Indeed city driving is going to clog it up faster.
One thing I have run into on these, and I'm not sure if any of you have had any problems, is the differential pressure sensor between the DOC and the DPF has a short silicone hose between the sensor and the exhaust. I have seen these hoses burn through because of the close proximity. If it is burning through partially, particles could be clogging the sensor or fouling it without setting a hard DTC.
The main thing I don't understand is why it would be normal for the an increase in frequency without a change in something. If you drive hwy, then drive alot of city, then the problem is obvious. But if you are a routine driver and the frequency to regen is more, something usually is going wrong.
Indeed city driving is going to clog it up faster.
One thing I have run into on these, and I'm not sure if any of you have had any problems, is the differential pressure sensor between the DOC and the DPF has a short silicone hose between the sensor and the exhaust. I have seen these hoses burn through because of the close proximity. If it is burning through partially, particles could be clogging the sensor or fouling it without setting a hard DTC.
The main thing I don't understand is why it would be normal for the an increase in frequency without a change in something. If you drive hwy, then drive alot of city, then the problem is obvious. But if you are a routine driver and the frequency to regen is more, something usually is going wrong.