Try to find out how manny 07.5 Duramax have the Blue smoke problem.

Does yours ??

What is the Build Date ?

There are two of us on the site that have the problem, I'm just trying to find if there is more and if there is, is it only a select few or a certian build date.

Thanks
STG1986

Mine was built May 07, get ulsd at Shell, no problems whatsoever. And with pulling the horses no way would I put up with it.

I have a July 07 build--2008 model...

I have run bio diesel, normal ULSD, and have put 2 tanks of LSD in it... Never a bit of smoke....

July 07 build date, 2008 model.Never any smoke not even when in regeneration.

No smoke from my pipe. wife says it was made in February, I am too lazy to walk out :) 4100 miles

No smoke from mine...doors are frozen right now so I won't be walking outside to look haha...but I always fill my truck up with ULSD at a local truck stop that gets 2 shipments of diesel per day in...

No smoke with mine either...

no smoke out of mine. It was one of the first one's built. Ordered the first week ordering was opened at the dealership. 12,500 miles with zero problems. :D

7.5 cc 4x4 2500 15000 + no smoke no problems happy with the mpg the best truck ive ever owned and I have had over 20 new ones

No smoke at 5,300 miles, truck has been great so far.

Blue smoke seems to occur during the regeneration cycle if low sulfur diesel, instead of ulsd, is used for an extended period, at least 6 tankfuls. I have wirnessed this with a truck that used ulsd for 8,000 miles with no smoke whatsoever, but after a few tanfuls of lsd the blue smoke is VERY evident during regeneration, probably burning off all the sulfur compunds in the DPF. So the first question is, have you been using lsd?

I use to get the blue/white smoke every once in a while but after I got rid of the DPF and CAT I now only get black smoke:D:D. No more blueish white smoke for me!

ted i have seen blue smoke out of a buddys truck and there is no chance what so ever lsd was used since in CA ulsd is the only thing avialable where we live.

That's interesting - I had assumed it was the lsd, but if it's something else it would sure be good to know exactly what causes the blue smoke. The one I have personal experience with is not burning any oil and the blue smoke certainly seems to be associated with the regen cycle. It lasts maybe 10 to 15 minutes and then disappears. And like the posts above, there are no codes or unusual performance. I would have expected the smoke to be quite white if it was simply burning diesel as part of the regen cycle but it has a real blue color.

I use to get the blue/white smoke every once in a while but after I got rid of the DPF and CAT I now only get black smoke:D:D. No more blueish white smoke for me!


I think the blue smoke comes from the regen mode from the DPF?

It's comical really, isn't it, that a truck with all manner of federally mandated emissions systems, blows off embarrassing blue smoke for 15 minutes in heavy traffic on the way to work. When it does it you would think it needs new rings and a rebore. The ecoterrorists have done us well.

9000 miles on mine. No smoke, no clean exhaust filter msg, no limp-mode, CEL has NEVER came on. PPE set to level 2. Stanadyne Performance Formula at almost every fill-up and AMsoil 5w-40 CJ-4 rated synthetic diesel oil.

ted i have seen blue smoke out of a buddys truck and there is no chance what so ever lsd was used since in CA ulsd is the only thing avialable where we live.

In the past some testing at certian fuel stations across the country have proven that even though the pumps are labled ULSD, LSD fuel was found. That being the case, maybe he got some bad fuel. Just a thought!
With that said there is a hefty fine if anyone is caught selling LSD on pumps labled ULSD.
__________________________________________________ _______

Oh yea,
:saluteusa:Happy New Year Everyone! :beerchug:

I have tried useing Bio-diesel, (20% Bio), regular diesel (what they say is uls) and I tried the same stuff I use in all my other diesel engines (its super clean uls, we centerfuge it into a clean tank from a holding tank, before it goes into our engines, you should see the mud we get out "Clean fuel"). I would say that I'm using the same fuel as every one else around Washington state. The interesting thing is that not every 07 Duramax does it.
It smokes always around 460 miles +-30, while the last regen was at 350 miles, it started smoking as soon as I got from the dealer, I just thought it was burning in, wonder if the dealer put the wrong fuel in it ?

I will try a additive next, any thoughts ?

No smoke here!

knock on wood brother!!!!!! so far so good.

I noticed mine smoking for the first time, while waiting at a stop light. I thought it was the car next to me, until he left and the smoke was still there. I was just below 1/4 tank and there was LSF in the tank.

no smoke here... but no LSD in CA

never had a smoke issue here either.

Jody

Never had a smoke problem here either...

Mine is a 7.5. delivery in June.
NO SMOKE period 10000 m

8000 miles in 5 weeks of ownership of the LMM and no issues. I have LSD as well and never seen a bit of smoke. Mine Was built 11/12/07.

One thing that I have always thought affected performance with these trucks was something I ordered my 04 and 05 with.. I thought I was being smart and odrerd them with (Federal emmissions override) I think the code is FE9. Both my 04 and 05 LLY's were far slower that my freinds that own them with no FE9. Also another freind has a 03 GMC LB7 and the thing felt like my LLY did in stage 3 and his was stock. The New LMM that I just had built that again was an option and I said no and this truck seems to be much better in MPG and ALOT more powerfull.

I could be tottaly wrong and I could have just bought to slow trucks. but do you guys blowing smoke have this option? it would be in your glove box on the sticker or on your build sheet.

8000 miles in 5 weeks of ownership of the LMM and no issues. I have LSD as well and never seen a bit of smoke. Mine Was built 11/12/07.

One thing that I have always thought affected performance with these trucks was something I ordered my 04 and 05 with.. I thought I was being smart and odrerd them with (Federal emmissions override) I think the code is FE9. Both my 04 and 05 LLY's were far slower that my freinds that own them with no FE9. Also another freind has a 03 GMC LB7 and the thing felt like my LLY did in stage 3 and his was stock. The New LMM that I just had built that again was an option and I said no and this truck seems to be much better in MPG and ALOT more powerfull.

I could be tottaly wrong and I could have just bought to slow trucks. but do you guys blowing smoke have this option? it would be in your glove box on the sticker or on your build sheet.


I just checked in my build sheet and I do have FE9 as an option. I never thought my truck was weak or not powerfull. Even in stock I thought my lmm had great power! Now MPG's thats another story! My MPG's are the worst. Even with all my upgrades. I think that the option FE9 is not an option anymore. I beleive that if Im not mistaken GM has to include this(required by new emmisions law).

Mine was built 6/17/07 - no smoke. LSD, 20% Bio, or ULSD...all the same.

Mine was built 06/07. No smoke

Yes I do have the FE9 option, now does this option require the truck to only use ULSD?
I wonder how "low" the ULSD fuel is around here?
Why would they sell a truck in a area that does not have the ULSD and then tell you you must use ULSD?

On a recent trip across West Texas in December, I experienced smoke coming from the tail pipe. It was built up sulfur particles in the filter - my truck had idled for nearly 3-4 hours (it was about 20-25 degrees outside). I have only used ULSD since the truck was new.

The smoke blew for about 10-15 seconds and looked as though something had gone horribly wrong while flying down the highway. The manual says it's possible for the DPF to create gasses as a product of burning the sulfur particles at such a high temperature if they are built up for some reason.

Haven't experienced it since. Although most of my miles are highway miles.

I too have a very early build 2007 LMM. I've run ULSD (at least as far as the pumps have stated) and Bio without any issues. Because I drive in bumper to bumper traffic I go into regen every 150 miles and I've had the clean exhaust filter message twice now. The last time it took a week to clear it. I thought it was going to go into limp mode and "see dealer now" message. I was able to clear it by driving 20 minutes on the freeway late at night, which is the only way to maintain over 30mph.

No smoke and inside the tailpipe looks as clean as the day I drove the truck home.

UPDATE
Just got it to puff blue smoke at the dealer so they could check the code at the same time as they wanted
They found the heavy blue smoke was happening at the end of the regen. The thought from GM tec is there is a crack or small hole in the DPF. That allows the extra fuel that is pumped into the filter to burn off the soot, to pool some where in the filter or surounding area. Then when it gets hot enough it burns off in a uncontrolled sequence.

The DPF can only be replaced with Factory approval.

Well, if the Factory does not approve of the repair and if the problem is not solved the lemon law kicks in and they buy the truck back.

This is the fourth time I have been to the dealer for this problem and the sixth time I have been in for some kind of repair, axel seal and water leaks.

Sure getting tired of being honked when it smokes and hanging out at the dealer.

Thanks stg1986 for posting some dealer reaction to the blue smoke issue. Obviously a LOT of trucks have it so someone in GM is going to have to find the cause and deal with the problem pretty soon. Please keep us informed regarding your progress/experience.

Update #2

I talked to a factory service rep today after I could not get hold of the dealer service rep and had not heard anything. I told him about the smoke problem, he looked up the service history and called the dealer and confirmed the problem and confirmed that the dealer had ordered a new DPF filter. The filter is coming from the factory should be here in about a week.

The factory rep gave me his name, number and case number and setup a time to see if that solved the problem with out asking, which was a big surprise.

If the problem is not fixed, a factory tec will step in and see if they can solve the smoke problem, after that, lemon law ?????

Since this is a emission problem, GM is being very helpful. See what happens.

Thanks for update #2, please keep us informed of progress.

Still seems a bit strange that niether the dealer tech nor factory tech can say that they know definitely that the DPF is the problem.

It seems from the postings here that there is a fairly common problem out there - you would think that GM would know already what was causing it.

I love my NBS pickup...I just hate having to drop the kinda money we drop in our trucks and be in the "learning curve" to get all the bugs out...:(

You Know, if it was black smoke when I put the peddle down, I would have no problem at all, love to wind that turbo up, but when I sitting at a stop light or in traffic not moving and its blowing heavy blue smoke like I just dropped a valve, that does not make me happy.
And its Brand New

Update #3

Well, the dealer says the problem is caused by the fuel I'm using and will not change the DPF or work on it till I change fuels again. This will be the fourth fuel I'v tried. The fuel I have in it now was contaminated by one of my guys who put 4gals of died off road in it, long story....
The funny thing isthat the smoke problem seems to be getting better, maybe I'm plugging up the hole or crack inthe DPF?
The dealer mentioned that they lose money or warrantee work and that has a lot to do about it. It might be one of the dealerships that will be closed by GM, as it is pretty small. Time to change dealers.
So I will keep running it and see what it does.

Just to add to the evidence that the blue smoke during regen is fuel related, I'm presently in Mexico and have direct experience observing both Dodge and GM trucks with DPFs. They smoke during regen down here, so it sure looks like the lsd is causing it. There is a high chance stg1986 that there is absolutely nothing wrong with your DPF.

One difference is mine smokes "AFTER REGEN" not during, each time it has smoked it has been from 10 to 60 miles after Regen based on checking the history in the comp. One time I stopped the truck during smoke and brought it in by tow truck and it was 46 miles after, another time it was 11 miles after. Yes the DPF could be fine, but why after?

I would agree with you that it should smoke more with Lsd or 20% bio, (which I was using) but it seems actualy to be less with that red off road fuel mixed in, we do have some additives in the offroad, anti-gel, bio-bor and powerpunch. But it was only 4 gals two tanks ago. They did run a regen cycle, idles at 2000rpm for a specific time.
Runs fine no codes or anything, regens about every 350 miles if I drive the same route.

It has not smoked lately. If it fixed itself I'm not going to mess with it, which I hope happened.

Well, that's interesting info. I must admit, I haven't checked to see whether smoking occured during, or after, a regen cycle on the trucks I'm observing. I just assumed that the smoke indicated regen was in progress. I'll have to watch more closely, but sooner or later someone will come up with the correct answer/interpretation. There are enough trucks doing it that GM must have done some research.