I'm just trying to get an idea how big this problem is. Hopefully it will be enough that we can take this poll to someone at GM.

No rough idle, but I have a vibration in the brake pedal. Anyone else have this?

I have this narrowed down to the point where I can reproduce it over and over again! It's only when the engine temp is around 180 degrees and I am idling at a stop light. Once the engine is warm I don't ever seem to see it.


I see it every day, just happens I am at a stoplight when my engine gets to this temp nearly every day.

I have this narrowed down to the point where I can reproduce it over and over again! It's only when the engine temp is around 180 degrees and I am idling at a stop light. Once the engine is warm I don't ever seem to see it.


I see it every day, just happens I am at a stoplight when my engine gets to this temp nearly every day.





My truck does EXACTLY the same thing. I to can duplicate it everyday.

Mine is also an every day thing now. GM is sending a field engineer and a regional tech to look at my truck. They are running some tests on the injectors Tuesday evening and I will be sure to post what they find.

338 check your PM's!

I have this narrowed down to the point where I can reproduce it over and over again! It's only when the engine temp is around 180 degrees and I am idling at a stop light. Once the engine is warm I don't ever seem to see it.


I see it every day, just happens I am at a stoplight when my engine gets to this temp nearly every day.





My truck does EXACTLY the same thing. I to can duplicate it everyday.








Same Same here also

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<TD id=HB_Focus_Element vAlign=top width="100%" background="" height=250 UNABLE="off">Guys it's not the injectors ...Have your dealer call tech ass. on this and they will instruct them how to perform the diag. on the problem. You will find that it's the powertrain wiring harness not available for at least three weeks. the plug on the harness is overheating and failing causing a missfire condition. Most common when injectors are pulling high voltage or working overtime. </TD></TR>
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It happens to me at the same stoplight every day.

Fitter48093- Why does this problem clear up when the engine gets up to temp then? I would love to believe it is something other than the injectors but I am working with the Quality Manager for Duramax and he is even under the impression that this is an injector. I would have to assume that he would know of a harness problem that would create similar characteristics as an injector.

Ditto here. Truck seems to run fine otherwise. My 96 Ford Gasser has done the same thing since it was new. I don't think they will find it to be a serious problem, but that's just an opinion.

I hope your right McRat. I am scheduled to get 4 new injectors for this same problem. If its a wiring harness, I will feel much better about it.

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<TD id=HB_Focus_Element vAlign=top width="100%" background="" height=250 UNABLE="off">What they have found is the harness acts up under high voltage loads from the injectors...i.e. cold fuel ,cold combustion . I kinda agree with you guys in this I hope it is just a harness ....My trucks been in the dealer for 35 days now and the two injectors they changed didn't solve the problems. .</TD></TR>
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Mine did the rough idle thing for the first time today, it only did it when it was in gear, as soon as I put into park it went away and when I put it back into gear it idled rough again, I drove it for a while and then it went away. I thought it had something to do with the Juice\Attitude I just installed yesterday because it hasn't had any rough idle until today so I took the Juice out after it cooled down and then drove a little and stopped a couple of times seeing if it would start to idle rough and it did not.


I am going to mention this to the dealer since my truck goes in to get a new accumulator and hose for the A\C problem on the LLY and that is also why I took the Juice\Attitude out so soon.

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<TD id=HB_Focus_Element vAlign=top width="100%" background="" height=250 UNABLE="off">New harness due the end of the week ....I'll keep you guys posted on the out come</TD></TR>
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the only thing i get is the exhaust note changing, i think its the egr. i notice it now becaust of no cat and 4" exhaust

I didn't have this rough idle problem before I had 11,000 plus miles on my LLY D-max. Some are having them at less miles and some aren't having them YET!http://www.dieselplace.com/forum/smileys/Ermm.gif Time will tellhttp://www.dieselplace.com/forum/smileys/Embarrased.gif

dmaxhd- Try running your truck up to about 165 to 180 degrees from a cold start and stop in gear. keep the truck stopped like that for a minute or so and see if you can notice it happening. The longer I sit the worse it becomes. More reason to believe it is an injector issue. I should know more Tuesday night though and I will post here whatever the engineer and tech find out.

maynard9089, have you tried changing your fuel filter yet? I got your PM, but I don't want to call the guy just yet. I changed my fuel filter for the first time saturday with 11,000 miles on my truck. So far I have not had any more rough idle. But its only been a few days. I'm going to give it another week or so before I call, cause right now I CAN'T duplicate the rough idle. By the way my filter was covered by at least 75% black crud on the outside(outlet side) of the filter and 100% on the inside(inlet side) when I cut it open. Edited by: 338_

maynard9089, I am not sure what to do. I took the truck in yesterday for the A\C problem to get fixed and told them about the rough idle and I checked with them this morning and they are saying it is injector #3 and that is all he told me. They said they would give me a rental for week or how long it takes but I am sure it won't be another truck.


Should I let it sit there or should I just drive it until they get an injector? It has only done this one time and it was fine after I took the Juice off before it went to the dealer...

Well they checked my truck out tonight and found that injector#2 was bad. The range on the injector should be between -6 and +6 according to GM specs. When they checked the truck in park injector 2 was showing about +5 while the other seven were no higher than +2. They put the truck in gear with the brake engaged and number 2 shot up like a bullet to over +15. They put a call into a Bill Carnaballi(sp.) who is the Duramax Quality Manager but had to leave a message. He is directly involved with my truck so they have to wait to see what he wants them to do next. The service manager is asking to change all injectors but I don't really expect to get that.

338- No, I haven't changed the filter yet. My truck began acting up with less than 4k miles. I am now just shy of 10k so I am ready but Im not changing anything until GM gets this corrected. Maybe Ill get lucky and they will replace the filter for free.

dmaxhd- They wanted togive me a rental CAR today and I told them no way. First, figure out what you need to fix and then get the parts. Then and only then will they get the truck. I bought this truck with a purpose and unless they want to loan me a like truck with a brake controller Im keeping it.

DItto....My truck, first thing in the morning runs ruff idle at stop light...I always warm it up in morning first, or at least try to...When I'm at stop light in gear, ruff idle, white smoke as in poor combustion..I thought we had pilot injector plugs or some such system to ignite fuel until engine warm....Wiring harness? Injectors? Engine not warm?...Ruffness goes away after driving a bit, and I don't have any problems with acceleration or cruising, just when truck is stopped at intersection, in gear...


MK

maynard9089, I completely agree. Since I wrote last I called the service manager and explained what was going on. He followed up with parts to see how far an injector was out and called me back. I took the truck in yesterday, they figured #3 is bad, they found an injector, it was overnighted, as of tonight when I stopped by the dealer they were just then installing it and were going to do some testing so I should know more tomorrow. I then asked the SM what if this does not fix it and I told him I do need my truck this weekend for sure and he responded, "if this does not do we will supply you with a truck for the weekend". He is pretty confident that this will fix it...
So far hats off to my dealer, hope I can say this after tomorrow.

Any updates on this yet? I just installed juice/attitude on saturday and mbrp exh. noticed at stop light sunday around 180 degrees with foot on brake, truck feels like it is missing, goes away after driving some more. i thought it might be related to juice, i was gonna pull it off and try again, sounds like it's not juice related. Mine has 4300 miles on it. I'm in Minnesota, south of the twin cities, any body had good luck with any dealers around the area for diesels? I haven't had the best of luck and haven't had the best service from the service department where I bought my truck. Thanks Edited by: JUSTIFIED HD

That is exactly what I had happen to my truck when I installed the Juice and when I removed it I did not have the problem again but I still took it in and they replaced two injectors. I am not convinced the Juice is not causing the problem...

Many of you seem to have this problem after the juice but my truck is and always as been stock. It started around 4000 miles and has gotten worse along the way. I am now over 10000 and it is pretty bad. The dealer has only located 6 injectors and is waiting for GM to locate 2 more. Im getting pretty tired of it now. To make matters worse, NY lost a legal suit about Lemon Laws and a judge has suspended any lemon law cases in the state. They are expecting it to go several months before it is settled. I really don't want to replace the truck. I would much rather they just got it fixed but it is nice leverage when you can threaten them to buy it back.

Does GM have a shortage on LLY injectors?


Maynard9089, sorry to here about your deal with your truck, i hope everything gets setlled with out losing your truck. I'm concerned because mine has just over 4000 miles on it and I wonder if this is the start of the down hill until I get injectors for it.

There is something about them having to get permission from GM to replace a bad injector on an LLY. Im not sure what the reason is for them not to carry more injectors in stock but I have found that DMax parts all seem to be scarce. With all the injector issues related to these engines you would expect them to have more on hand. I would also have expected them to be able to diagnose them problem without having to get the higher ups involved. I had made a complaint with a GM executive whose e-mail address I happened to have after the fourth trip to the dealership. Now an Executive assistant calls me every day to update me. They have actually involved the GM Duramax Quality Manager with my truck. He has been helpful but for obvious reasons he can't devote his full attention to my truck. He did mention that they were in the process of developing a program to calibrate the injectors. As of last week he expected it to be ready in three weeks or so. I would be interested in this since I expect it could tweak the HP and get the best MPG available for the engine.

maynard9089, I am now having some SERIOUS idiling problems. My truck now idles rough at every temp when I stop at a light and the white smoke(unburned fuel) coming out the back is ridiculous. Man does it stink to! I feel bad for the people behind me. So, it looks like my truck will be taking a trip to the dealer sooner than I wanted. 2 times to the dealer for engine repairs in under 12,000 miles seems a little ridiculos to mehttp://www.dieselplace.com/forum/smileys/Cry.gif. I'm thinking I should of just stuck with a bigblock now, especially now that diesel is more than regular gas here.

338- Diesel is inching up close to even with the regular gas price here as well. Im still glad I have the diesel though. The problem I am having believing the BS from GM is that the engineer involved with my truck claims that the problem is just an injector out of calibration. If that is the case, then why does it continue to get worse and why wasn't it like this from day one? I think its time for you to call the DMax Quality manager. If you lost the number, PM me and I will resend it.

I'll call him tomorrow, I still have the number.
The truck is going in no later than monday.

Thanks

maynard9089, that guy won't answer his phone, and there is no voicemail to leave my name and number.

You'll like this story. When I took my truck if for service tonight(monday), the guy at the service counter told me they would not even be able to diagnose my truck until wednesday. The reason is because they have another D-max in for service ahead of mine getting all 8 injectors replaced tomorrow(they only have 1 diesel tech). He also told me there is a minimum 3 week waiting period on injectors right now. So basically if I need injectors or my truck i'm screwed for 3 weeks. I smell a big recall or extended warranty on LLY injectors in the near future. There definitly has to be a serious problem if there is a 3 week minimum wait on injectors.

My injectors are now in and it took about 2 weeks. They also told me 3 weeks. Check your PM for a new number.

maynard let us know if the injectors fix the problem.

Good news!, I have my truck back and it seems to be fixed 100%. It idles so smooth now.

Here is what they said.

12607 FAULTY FUEL INJECTOR #2 J5650 2.3 CHECKED N FOUND NEC
TO REPLACE #2 INJECTOR PER P0302. FOUND 14.7 MS INJECTOR
BALANCE RATE ON #2 INJECTOR WHILE MISFIRING. FOLLOWED FLOW CCHART FOR P0300. CLEARED CODE N TEST DROVE 8 MILES OK AT THIS TIME

338_ So the wiring was fine? I wonder if mine is wiring since the replacement of injector didn't fix it.


Dennis

After 10-11,000 miles, mine just started the rough idle at cold a couple of days ago. Not bad, but noticable. Once warmed up, it runs perfectly. I guess I can now answer "yes" on the poll... Damn it.

338_ So the wiring was fine? I wonder if mine is wiring since the replacement of injector didn't fix it.


Dennis





Yes, my wiring was fine. Maybe you have/had more than 1 bad injector.

338- Im glad to see you are happy. I hope the glee continues. I dropped my baby off at the dealers this afternoonhttp://www.dieselplace.com/forum/smileys/Cry.gif. I miss it already. They gave me an 05' Chevy "Wimp"pala which is OK but I haven't driven a car in 10 years+ and I now remember why. They said they're are going to start replacing the injectors first thing in the morning so I hope to get it back in the afternoon.

After 10-11,000 miles, mine just started the rough idle at cold a couple of days ago. Not bad, but noticable. Once warmed up, it runs perfectly. I guess I can now answer "yes" on the poll... Damn it.


Filled up with a fresh tank of fuel along with some Stanadyne and the problem is gone. Maybe my problem was crappy fuel? As I think about it, that tank of fuel seemed to burn "stinkier" than usual.

I have waited for a week to post all 8 injectors were replaced last week so far the rough idle is gone.I asked if any injectors were sooted up and they said no.so far it seems to be fixed or will they go bad again when I put a few miles on them. and als they replaced the belt and the shut down belt squeek went away.

I may be wrong but I believe that the problems we are encountering with LLY injectors is differant than the problems the LB7 owners are(were) having. My understanding, after having talked to the techs as well as Bill Carnavalli(sp), who is the Duramax Quality manager at GM, is the LLY's suffer from a calibration issue rather than a build up of soot and debris. GM was working on a program to calibrate these injectors rather than replace them. It should be available any day now if it isn't already.

I have an lly engine in my 04 cc duramax I just wanted to know if they noticed any problems when they looked at the old ones

I do not know how they looked yet. I will ask and hopefully get to inspect them myself when I pick the truck up. I hope it is Tomorrow. This is as bad as the wait for the truck to be built. I feel like an expecting father.

Same problem with mine just showed up in the last week, i was running standyne most of the time, but ran out. Been 3 tanks since i put any in and now the rough idle has started. Not sure if it is related to that, but looking forward to hearing how this all pans out.

? - if they claim its a calibration issue then what do they calibrate, the PCM or other ? im curious as i run the TTS tow tune and if they change something on my stock pcm then i guess ill have to get it changed on the PCM thats loaded with the TTS - is that correct ??

I believe they have to calibrate the injector itself. I spoke with the DMax Engineer again this morning about the calibration program and he said it is still not ready. I would have felt much better if this could have been fixed as easily as plugging in a computer. I looked at my old ones today but wasn't really sure of what to look at. Everything I saw was pretty clean and appeared free of build-up. I was suprised at the size of them. I had expected something smaller, in the range of a spark plug or so. So far everything seems to be corrected. No rough idle, smell or smoke. I tried hard to duplicate it too. Before the replacement I could duplicate it easily.

Techlink article posted by jbplock below that I thought may be related to your issues. Didn't read through all the posts, but thought I'd throw it out there FYI. Remembered reading the thread and then read this today.


Some Chevrolet and GMC vehicles with 6.6L (LB7 LLY) diesel engine may exhibit rough idle, clatter noise, stall and/or DTC P1223 through P1244. The fuel injector balance rates fluctuate during the rough idle. The IGN 1 voltage may read 12.9 volts all the time, regardless of rough running condition.

After completing the published diagnostics, and the concern described above remains, check for a loose ground bolt at the lower right side of the engine block (G102 and/or G106) to correct this concern. Refer to SI for the location of ground bolt.Edited by: Minn-Kota

It is funny at first I thought it was me just feeling something in the seat. Then it did get worse and I would pop it into N and it would stop. Put it back in D and it was gone. I never watched the Temps to see when it happened but to my recollection it was warm or "cool". Now that I saw the 160-180 thing I looked the last time it did it and it was right at 180. The other thing I never looked at when it was doing it was the exhaust. This time when it was shaking I angled my mirror down and looked and it was dumping smoke out. Guess I will take it down to the dealer and see what they say.

Well I got the standard answer from my SM at the dealer I buy my trucks at. He was good and said that one other customer ( their Snap on Too guy) had the same problem. He called in to Tech support and got the GM canned answer. He told me to run Stanadyne in the fuel and it should take care of the problem. Well I have not had the problem with the new tank and that is ok for now but I dont want to be 'tied' to a bottle for my 40k truck.

Mines been doing it since new. Even after two tanks of Stanadyne.

After 10-11,000 miles, mine just started the rough idle at cold a couple of days ago. Not bad, but noticable. Once warmed up, it runs perfectly. I guess I can now answer "yes" on the poll... Damn it.


Filled up with a fresh tank of fuel along with some Stanadyne and the problem is gone. Maybe my problem was crappy fuel? As I think about it, that tank of fuel seemed to burn "stinkier" than usual.





I am assuming mine is somthing unrelated to fuel. Even on the same tank of fuel, it will only idle rough on occassion, and only while warming up. The last time it happened, I reved up the motor while sitting at the light and the problem went away. Doubtful that it is fuel or the loose ground wire problem...

IT HAS BEEN 2 TO 3 WEEKS ALL 8 INJECTORS WERE REPLACED DO TO ROUGH IDLE AT 180 DEGREES TRUCK IS RUNNING FINE SO FAR i RECEIVED INFO AT WORK FROM GM THEY SAY IT IS A IN BALANCE PROBLEM OR A LOOSE GROUND AT THE RIGHT FRONT OF THE MOTOR

i just got back from stealer visit for some warranty work, one of which for rough idle in drive when stopped, and they said it check out fine, no problems ?? it drives fine and hasnt thrown any codes - stealer said it was just a dmax diesel thing and that it would probably go away. it only started this about 500 miles ago and i have 6500 miles on it now

I bought my Max 8 months ago and have had the same problem since day 1. Over the 8 months I have installed a 4" exh and was a beta tester for the LLY juice w/ attitude. I have taken my truck into the dealership 6 times with this problem and they have blamed the exh and the Juice. Everything is removed and returned to stock and I am still having the same problem at idle when stopped. They have replaced the EGR valve and the PCM and still nothing. I actually had a service aggent tell me that the duramax is a new system and their tech was not totally up to speed on it. Any suggestions on where I should go from here? I am sick of smoking out cars behind me every day.


BW


http://www.dieselplace.com/forum/smileys/Angry.gif

My dealer was checking my balance rates with the truck in Park. GM advised them to recheck in gear with the brake applied and bingo. Number 2 was +15 and higher. All 8 injectors were replaced last week and so far so good.

When they replace the injecters in the lly's are the injecters different than the originals, if not how long before these new injecters start to fail again. If the injecters are different maybe GM should recall all the lly's and fix all the injecters. Seems that MANY or us are having this rough idle, mine seems to be getting worse(starting to smoke more at rough idle) Also mine seems to idle like this only randomly not consistantly (kind of odd) Going to Dealer this week will find out more! http://www.dieselplace.com/forum/smileys/Angry.gif

i have an 04 lly same problem rough idle, smoke, bad smell from exhaust, terrible fuel economy.


dealer replaced all 8 injectors ran good for 3 days


slowly symptoms started appearing again. 2 months later, and my truck is worse than before.


i am a loyal gm man with 8 chevy's and 1 olds. under my belt


but i feel left out in the cold by gm at this point. i love my truck it's beautiful and i dont want another truck, i just want to fix this one


somethings wrong but nothings beeing done we pay lots of $ for our trucks and d-max owners are loyal to gm we pay top $ for top grade and we deserve top service out of our trucks. most of us use our trucks for our business towing trailers, or taking the family too the lake or mountains. we need the best thats why we pay top $ im disapointed in the way gm has been handling the problems we are having.

AMEN!!!!! Moverdan.

MoverDan- I agree with you 100%! In the past I have voiced my complaints to John Smith (john.f.smith@gm.com) who is a GM VP and the head of Marketing. He has been very helpful in directing my complaints to the correct people who work to make things better with my vehicles. Give it a shot. Include a phone number because they have always called me by the next business day.

Brought my truck in for oil change, fuel filter, rotate tires, and told them about the rough idle situation. They said that there was a update for this that came out 9-3-04 but they couldn't find it any where on there computers yet http://www.dieselplace.com/forum/smileys/Confused.gif They said they would give me a call when they get it http://www.dieselplace.com/forum/smileys/Ermm.gif I guess I'll have to wait and see.


Has any one else heard anything about a update for this problem.


When they get back with me I will post the findings

Would love to hear a solution.

http://www.dieselplace.com/forum/smileys/Confused.gif[/img] They said they would give me a call when they get it http://www.dieselplace.com/forum/smileys/Ermm.gif I guess I'll have to wait and see. </font>[/b]
Has any one else heard anything about a update for this problem.[When they get back with me I will post the
findings

- let us know what you find outEdited by: tbone1227

Awaiting anxiously.

UPDATE!!


Wife just called and said the truck us done. Dealer found the new bulliten out on the "rough idle and smoke" issue. Said it was a problem with the calibration. I will post details after I see the work order. We shall see if it's fixed. They were able to duplicate the rough idle situation wich was probable why they looked further. I hope this puts it to bed!!

I was working with the Duramax Quality Manager most of the summer to get my truck fixed for this problem. He was working on a program to recalibrate the injectors rather than replace them. It sounded as though this could be done without removing them. The expected date for completion was about 2 weeks ago so I suspect that it has been released. That is great if it has and hopefully it will solve this problem for good.

I was working with the Duramax Quality Manager most of the summer to get my truck fixed for this problem. He was working on a program to recalibrate the injectors rather than replace them. It sounded as though this could be done without removing them. The expected date for completion was about 2 weeks ago so I suspect that it has been released. That is great if it has and hopefully it will solve this problem for good.


Looks as though they got it done. Thanks for the help. It has to start with someone.

I wasn`t so sure it was a rough idle as much as something to do with the tranny or torque converter because it feels as though the truck is kinda lurching and then if you put it in neutral or park it instantly stops. Wouldn`t it continue to idle rough in park or neutral if it was a rough idle? I don`t know. Thanks, Chris.

Chris- My truck's problem would disappear in N or P. When they checked the balance rates they were in spec even though my #2 was in the high 4's, low 5's (GM calls for -6 to +6). This test was done in park. GM advised them to also test in gear with the brake applied and #2 shot up into the +15's. They explained that it had to do with a "load" on the engine. These engines are producing so much low end torque that in gear they are trying to work.

Ok guys, Here is the wording on my invoice.


Rough idle on cold start up with truck in gear.


Cause: Calibration


J6354 Engine control module reprogram, 546 WSN


7054 Reflash run scan diag for codes--None stored--Found bulliten for reflash--Complete reflash and road test while watching balance rates


No other problems found--vehicle is operating normally at this time.





So that's the story. I will keep everyone updated.

Thanks for the info,keep it comin people!!

i just got back from the dealer they re-calibrated the truck can't be specific on what exactly, but was for the ROUGH IDLE, SMOKE condition sorry didnt work my truck still idles rough, and smokes.


mine smokes when i punch it, not in idle

Wife took the kids to schoole this morning wich is when she can make it idle rough. She called and reported NO rough idle this morning. Looks like it's fixed.

All,


Took my truck in today and they are going to replace and/or calibrate all of my injecters. Problem is of course the injectors are 3 weeks out. So they want me to pick my truck up tomorrow and drive it for 3 weeks, and then when they get their parts in replace them. Does this sound like a good idea? I mean driving it for 3 weeks?


Thanks,


BW

I drove my truck from mid-May until mid-August with this problem and had no problems. They replaced all the injectors and now everything is good.

I had this problem. I took it in to the dealer. They called Tech Service. They backed off the injector pressure from the pump. All is well......no new injectors, wiring harness, anything.....

I still haven't gotten mine fixed, I called them on Tues. and they said they still didn't recieve the updates yet! http://www.dieselplace.com/forum/smileys/Angry.gif Is any one else still waiting? This rough idle sh*t is really starting to P*ss me off, it's very embarrassing at the stop lights or any plce you stop and idle with it in gear. Does any one know why it would take so long to get this update, they said it was released on 9-3-04 and others have gotten there update.

I just picked up my 04 gmc lly from the dealer. He said injector number 3 was bad. Called gm techs, and advised him to re-program truck. Also found loose ground on block. Truck seems to run fine between 160-180 degrees. Service did not know of re-calbrating injectors until they called gm. So the fix is out there, make sure your service department calls gm to recieve fix.. First dealer didnt find any thing wrong with truck but the second did.. Tomorow I will try edge with juice again to see if the problem is fixed.

Just had mine flashed today. Here is a copy of the code sheet from the GM web site where the tech downloads the latest flash programs...


http://www.dieselplace.com/forum/uploads/GM_Codes.GIF

One more note...


For those that have not had an updated flash, it may be worth a trip to the dealer to have done, even if you do not notice the rough idle symptom. Maybe I am dreaming, but after the update my truck seems to idle quieter all the time, and is getting more consistant fuel mileage. My truck was built in Feb of 04 so it is one of the newer LLY's, which would explain the older PCM program it had.

Had mine updated / recalibrate injectors and seems to have taken out most all the smoke and chugging. Also seems quieter if that is possible!!!?

Had mine updated last week, shake and smoke at 180 deg. water temp gone. Idles better and mileage seems better.

Had mine updated today, to early to tell but so far so good. I tried to get the "parking lot" surge like I was getting before the update but since the update so far I haven't been able to get it to happen. Need more time to for other things such as mpg's...

Had mine into my GM dealership in Edmonton a few days ago. Engine was running a little rough and it was smoking (black) a fair bit. They diagnosed a problem with injector #2. Called GM Tech got approval to replace it. They happened to have one in stock so they did it right away. I watched them do it in the shop. (#2 is pretty easy to get at). They also did the update to the flash. Was with the diesel mechanic (a very nice a knowledgeble fellow) when he checked the fix on the computer...and then went for a test drive with him. Runs great ! (no black smoke)- really smooth ... at idel and through acceleration. Drove it back home (350 miles) and everything (knock on wood!) is just fine.

Funny the replaced my #2 also. Said it was JUST out of the limit but should take care of the problem along with the reflash. So far everything is great, no rough idle or smoke. Hope that is a done deal.

I could be way off-base here, but I wonder how many LLY injectors had been replaced when all that was needed was the reflash...

Sammy- GM didn't get the fix out until early September. They were working on mine in July and August and at the time the Duramax Quality Manager for GM told me they were about three weeks from completing the software. It ended up closer to six weeks but from what I've heard from people is that it works. They replaced all eight injectors on my truck because the software wasn't out yet but I think Im going to ask the service tech to do the reflash in the next couple of weeks.

Its been about 2 weeks and the Reflash seems to have fixed mine !http://www.dieselplace.com/forum/smileys/smiley32.gif


Goes in tomorrow for the rest of the LLY stuff (ac accumulator &amp; hose, body moldings, cd player, and vibrating side mirrors). Now if i could just run in the 13s and get 20 mpg i would be tickeled !http://www.dieselplace.com/forum/smileys/smiley36.gif