If your dpf was cracked?
Junior User
Joined: May 2007
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I had my dpf replaced 8 months ago. I had black tail pipes. I don't know if it was cracked or what. After cleaning the tips when they replaced the dpf, they have stayed clean now with a few thousand miles on the truck. As a side note, I have never seen a GMC/Chev with black tail pipes. I have seen many Ford trucks with the black tail pipes... gene
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Joined: Aug 2008
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From: Frederick, MD
you should still have them occur, although the DPF is not catching all the soot. But there may be more to it than that. So I would have it checked out. Maybe a sensor or fuel issues.
Post Fiend
Joined: Jan 2009
Posts: 6,521
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From: Greenwood, SC
I know a guy that has heavy soot in the pipe and spews black exhaust every time he accelerates. Dealer keeps telling him that nothing is wrong. I just don't get it! Completely stock, regens occuring every 700 miles or so. Blows my mind.
The regen will occur but the integrity of the system HAS to be compromised. The signal for a cycle to be complete should be the reduction in exhaust back pressure. If the DPF is cracked or shattered then the pressure monitors must be getting false readings. Have it checked out but unfortunately you'll have to be very persuasive to get it fixed (at least this is what many folks report).
The regen will occur but the integrity of the system HAS to be compromised. The signal for a cycle to be complete should be the reduction in exhaust back pressure. If the DPF is cracked or shattered then the pressure monitors must be getting false readings. Have it checked out but unfortunately you'll have to be very persuasive to get it fixed (at least this is what many folks report).
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Senior User
Joined: Sep 2008
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Right,
I have very little black at this point just started to notice it,
Might give them a call and see what there response is.
It would either be a sensor problem, fuel problem or cracked dpf ?
I always fill up at the same station didn't think it would be fuel.
have not seen any smoke out the exhaust either, gray or black
I have very little black at this point just started to notice it,
Might give them a call and see what there response is.
It would either be a sensor problem, fuel problem or cracked dpf ?
I always fill up at the same station didn't think it would be fuel.
have not seen any smoke out the exhaust either, gray or black
Post Fiend
Joined: Jan 2009
Posts: 6,521
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From: Greenwood, SC
If you don't have sooty pipes then there may be a number of things. A guy that goes by Vloney posted about this, I think he is a mechanic at a Ford dealer in MO. He makes a point that sooty pipes can be caused by several things, not necessarily a problem with the DPF. I think some cases are a rich/overfueling injection system. The sensors could be giving trouble but it would be impossible to know if there are no codes thrown by the computer. I had a sensor go bad in my exhaust and it ran for a whole day (300 miles or so) before the check engine light came on the next morning.
You will probably get nowhere with any of this if there is not a check engine light on. But remember, I'm trying to think out loud here and tell everything that I know but I am not a mechanic/diesel tech. As far as I know a cracked DPF is a condition that does not typically throw an error code and this is why it's such a problem to diagnose.
Good luck. If it were me I would probably drive it for a few weeks. If you happen to be in a jurisdiction where there are emissions tests you could see if you can get it to fail. This would be a certain attention getter at your dealership!
You will probably get nowhere with any of this if there is not a check engine light on. But remember, I'm trying to think out loud here and tell everything that I know but I am not a mechanic/diesel tech. As far as I know a cracked DPF is a condition that does not typically throw an error code and this is why it's such a problem to diagnose.
Good luck. If it were me I would probably drive it for a few weeks. If you happen to be in a jurisdiction where there are emissions tests you could see if you can get it to fail. This would be a certain attention getter at your dealership!
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Joined: Jun 2008
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From: Park Rapids MN
I had my truck at a dealer I didn't buy from a week ago for another reason. Image my surprise when I got a call from the service rep and he told me they wanted to change my DPF because I had black pipes. After talking to him a few minutes and suggesting there could be another reason I decided to let them do it. If I get black pipes again then I have another issue. My problem is I'm happy with everything about my truck and worry about the litle things that can go wrong once somebody starts tinkering with it.
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Senior User
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I know a guy that has heavy soot in the pipe and spews black exhaust every time he accelerates. Dealer keeps telling him that nothing is wrong. I just don't get it! Completely stock, regens occuring every 700 miles or so. Blows my mind.
The regen will occur but the integrity of the system HAS to be compromised. The signal for a cycle to be complete should be the reduction in exhaust back pressure. If the DPF is cracked or shattered then the pressure monitors must be getting false readings. Have it checked out but unfortunately you'll have to be very persuasive to get it fixed (at least this is what many folks report).
The regen will occur but the integrity of the system HAS to be compromised. The signal for a cycle to be complete should be the reduction in exhaust back pressure. If the DPF is cracked or shattered then the pressure monitors must be getting false readings. Have it checked out but unfortunately you'll have to be very persuasive to get it fixed (at least this is what many folks report).
I only have 7k on it she's a weekend warrior, so you could be right.
when you guys started to notice tail pipes turning black. did it happen overnight or slowly
maybe i should post a pick
Freshman User
Joined: Aug 2004
Posts: 44
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From: Oregon
I have a cracked DPF too, mine regens every 670 miles, almost exactly. I get 18.6 on the hwy and 14 in town. It is a 08 F250, short bed, crew 4x4. I am NOT planning on a new DPF. I figure it is catching less soot and regen'ing by miles rather than back pressure. My 2 cents.
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Joined: Nov 2000
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From: Pflugerville, tx
sam
Elder User
Joined: Aug 2004
Posts: 932
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From: Edmond, OK
My tailpipe was clean as new up to 18,000 miles; then they went black.
Dealer comments were it is a diesel, they are suppose to be black; mine regens anywhere from 260 miles to +450 miles but most often between 300-400 miles. I reset the second trip odometer every time it cycles.....
I keep hoping for a check engine or some new service advisory from Ford about the issue; when it gets close to no emissions waranty I'll push the issue. I'm at +41,000 miles now.
Bob
Dealer comments were it is a diesel, they are suppose to be black; mine regens anywhere from 260 miles to +450 miles but most often between 300-400 miles. I reset the second trip odometer every time it cycles.....
I keep hoping for a check engine or some new service advisory from Ford about the issue; when it gets close to no emissions waranty I'll push the issue. I'm at +41,000 miles now.
Bob