Over the past month or so I've noticed a rough idle while stopped in gear, and it's puffing alot of smoke. I've tried different gas stations with no change and now it seems to be getting worse.


I frequently drive in a high traffic density area and the smoke at stop lights is becoming very annoying to me and the other drivers.


I'm going to put a Tech 2 on it today and maybe take a trip to the dealer if time allows me to.


Oh yeah, it's got approx 6000 miles on it.


Any ideas?

Mine does the same thing it almost seems like its going to stall.The dealer told me it was normal for the lly to do that that there was a bulletin on it ? I dont think having un burnt fuel pouring out the exhaust is normal

Sounds like there is a problem with the EGR valve. See message below...


My brand new 2004 2500HD, Duramax (LLY) is at the dealer due to engine hesitation between 1600-2000 RPMs. The dealer states that the EGR valve must be replaced. The truck only has 1,000 miles on it. Has anyone else had this issue? Is this a wide spread problem?


I hope this is not a sign of more trouble yet to come. I tow a 11,000# fifth wheel and don't need these type of problems on the road.

My truck is in the shop as I type this with the exact same problem. Rough idle at stop lights, wants to die, and smoke out the pipe. Only have 2800 miles on it. Also started noticing about a week ago that the glow plug idiot light never went off before starting. It used to light for 2-5 seconds then go out and I'd start it. Lately, on the first starrt of the day it just stays on. I go ahead and turn the key, start the engine and it goes out. Edited by: 4Fielders

4Fielders:


What is the dealer doing to fix the problem?

Haven't heard anything back yet from them, not sure if they've even torn into it yet.

My LLY did the same thing shortly after I got it, went to start it one cold morning and the glow plug light stayed on. When I finally turned the key she barely started and blew out a big puff of white smoke so I could tell that the glow plugs weren't even on. Took it to the dealer and they replaced the glow plug control module and it has worked great ever since. Hope this helps.

I haven't been having any glow plug light issues or hesitation at 1600-2200, my problem is only occuring at idle.


It's really embarassing sitting at a red light blowing all that smoke. And I shouldn't have to put my truck in neutral at every stop just to avoid the smoke.

Just got off the phone with the service department. Said GM has found a problem in their glow plug module but doesn't have a fix yet. Guy said that they can reset the module but that doesn't mean the problem won't happen again. Said I'll get a letter in the mail from GM when they figure out a fix. Also said the smoke probably isn't related and that they're checking the injectors. Gonna be next week before they're through with it. I'll keep you posted. Edited by: 4Fielders

Was just told it's going to need a new injector. Dealer didn't know yet how long it would take to get it in. Hope it's soon because we're planning on leaving to go camping Friday afternoon.

RE: glow plug LLY issues, see the posts below:


http://www.dieselplace.com/forum/forum_posts.asp?TID=7882&KW=glow


http://www.dieselplace.com/forum/forum_posts.asp?TID=6880&KW=LESDL

After looking at the Tech 2 it looks like it's injector #4. The code for cylinder #4 misfire was set, and when I disabled cylinder #4 on the Tech 2 there was no difference in the rough idle. Every other cylinder when disabled made the rough idle significantly worse.


I'll be taking it to the dealer to get it checked out when I get back in town.

I've noticed a rough idle about four times now. Its been infrequent so far. It feels like it wants to stall and when I get on it it doesn't respond right away. After it does pick up it seems to take care of the idle. I haven't noticed smoke but I have noticed that I smell diesel more. I had attributed this to warmer weather (windows down). Now Im not so sure. Im taking it to Ohio for the weekend so I won't be able to get it in the shop until next week. God I hope its not an injector.

I'm starting to have this same problem and I called the dealership to drop it off in the morning. I've read this post several times to make sure I don't miss anything. I asked the dealership about bad injector and they said they haven't had any problems with the LLYs. Guess we will see tomorrow.


Did anyone get anymore information about this problem? Did you have this problem everyday and everytime you stopped?


My rough idle and white smoke out the exhaust doesn't happen everyday or everytime I set at a stop light. But, it has started to happen more and more lately.

My truck has been in twice and they haven't found/fixed a thing. Im going to try another dealer soon. The tech puts it on the computer, finds no codes and says that it is un-reproduceable. It did it again this afternoon.

Maynard9089,


That is what the dealership said about mine also. Took it in and they said they did all kinds of test and couldn't get it to reproduce the problem and gave it back to me. If it keeps happening I'll just keep taking it back to the dealership

My truck would not idle rough or throw smoke all the time. It would only do it after it was warmed up, but not all the time then either. When I took my truck in to be hooked up to the tech 2 it was warm. Tech 2 showed a misfire on one cylinder.


Make sure your dealer is checking out the problem when the truck is warmed up. Mine was checked cold one time and it checked out fine.


Mine is also an LLY.


Norm


Edited by: Norm

Did anyone ever figure out what the problem was for sure? Just this last week at 6,000 miles the whole rough idle deal started on my truck while at stop lights every once in a while. Is it injectors or what?

I believe so. I just checked my rough idle out with tech II and got a misfire on #8. I brought it in to the dealer and they said they will replace all 4 injectors on that side. Here we go again!http://www.dieselplace.com/forum/smileys/Angry.gif

I have roughly 7400 mi on my 04 lly I noticed a rough idle and smoke in drive with the brakes on at around 160 degrees when it gets to 195-210 it goes away

I have roughly 7400 mi on my 04 lly I noticed a rough idle and smoke in drive with the brakes on at around 160 degrees when it gets to 195-210 it goes away


Mine is doing the exact thing at 160 and going away at 195-210. I've been out of town and haven't been able to take my truck back to the shop, but I'm going to make an appointment this week.

Last night I removed the egr valve and pushed the plunger of the egr valve itself it was free not sticking, so I believe its either the erg actuator or the injectors. but the truck really didn't have a rough idle today so I will give it one more day before calling the dealer.

Mine started out doing the same thing. It would only idle rough until it got warmed up. Now its bad all the time, real bad. Mileage is shot also. Now I have to put it in neutral when Im stopped or it shakes the whole truckhttp://www.dieselplace.com/forum/smileys/Angry.gif

My truck has been in four times so far and still nothing. The dealer checks for codes, finds none and pretty much says there is nothing they can do. I have even been able to produce the problem for the tech but without a code he won't (can't) do anything. They inquired with GM and were told that it is a known problem and a solution is in the works. They want me to call back every two weeks or so.http://www.dieselplace.com/forum/smileys/Angry.gif

I too have noticed mine getting worse but it still is only doing it until it warms up. I have noticed my milage fluctuating quite a bit. It has changed from 20.6 to as low as 12.6 then back up again. Im not getting a lot of smoke though as others have noticed. At least Im not noticing it.

How about a strong smell in the cab?

Yes. Strong diesel smell when windows are down.

I also get a strong diesel smell in the cab.

Looks like they have a serious issue on their hands. I talked to my dealer today and they are having trouble coming up with injectors. If you have the problem, take it in ASAP cause it may take a while to get some new ones.

Dealer I took mine to for this problem said they won't replace anything cause it is not throwing codes.

I have contacted a GM (very) higher-up about my (our) problem. He has forwarded the issue to the "more knowledgable" individuals to get help. GM is currently on shut-down until Monday though so I don't expect anything until early next week. I will be sure to post anything I find out. This guy has been a super help for me in the past so I have faith that he will come through again.

Well I just got a call from the "GM executive office" in regard to my problem. They verified my concern and are now calling the dealership to try to square this away. They said they will call back no later than Thursday evening to update me. In my original e-mail to them I included a link to this topic which she mentioned checking out. Hopefully we will get somewhere soon.

GM called back and Im on hold until Monday when everyone is back from shut-down. The problem is being forwarded to someone more suited to address the problem. Ill keep everyone updated.

I have been reading alot of posts about the llys and seen that some have had problems at idle. I felt fortunate becuase I haven't had any prob's at a little over 11,000 miles on my lly. Then at 11,458 miles mine started this rough Idle sht!!! http://www.dieselplace.com/forum/smileys/Angry.gif Has anyone with these problems had pre-filters on there fuel systems. I had a sputter back at 10,698 miles and dealer told me it was probably bad fuel, so I didn't think much more about it till lately.

No pre-filter for me. I don't believe it is fuel related because it tends to be more temp related. I have a few ideas but nothing that I would hang my hat on. I hope to know more this week when GM gets back to me.

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<TD id=HB_Focus_Element vAlign=top width="100%" background="" height=250 UNABLE="off">Well everyone I've been off on vacation...So I missed the start to this post. I've been dealing with this issue since my LLY was brand new. As of the 6th of July the truck sits not able to run.. With only 3,600 miles on it at the dealer. I'm at day 20 waiting for two injectors good luck convincing GM that there is a problem, Because I just started a complant with the BBB. GM insists I'm the only one with these conditions. I will post more at a later date</TD></TR>
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Well injectors appear to be the problem. The quality manager for DMax called me today and he feels the problem is the injectors. They are coordinating with a regional service manager, the dealer and some engineers to get my truck in and check some numbers. Particularly the balance on the injectors. He said that the Dmax has an operating range of -4 to +5 or so and that it won't trigger a code until around 15. He also asked about the build date for my truck (week of 2/23). Remember the hold on trucks shortly after that? GM was real hush hush about why. Anyways it may not be until next week that the truck can be checked out agin.

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<TD id=HB_Focus_Element vAlign=top width="100%" background="" height=250 UNABLE="off">Here's an update....Two new injectors installed, Problem NOT fixed truck still at dealer. Should know more Tomarrow, </TD></TR>
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Fitter48093- Sorry to hear that. I think GM has probably misdiagnosed the injectors more often than not. I hope that they are able to get mine done correctly soon. I have had my truck in at least four times now and they are currently planning a fifth. If I have any problems like you are having Im going to go after them on the lemon law. I love my truck and would hate to get another but If GM wants to sell diesels then they need to know how to build and fix them.

I took my d max in yesterday for the same problem and today they called me to ask if they could keep it till tomorrow because they could not duplicate the problem. so we will see what tomorrow brings.

I pretty much have the exact same idle problem with mine. A rough idle at a stop with the brake on and also a strong diesel smell. Only seems to happen while the truck is warming up. On the Tech 2 it showed one injector balance rate of around 12-14, so that one was replaced (3 weeks to get the injector). It solved the problem, but it now has returned again this last week. I wish I had a Tech 2 to see if it is the same injector acting up. My understating is dealers can't just order a new LLY injector for replacement without some special testing procedures first. I guess I’m back to the dealer, but still curious as to what everyone else discovers with theirs.

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Maynard, Here's the funny thing about it I live in Warren Michigan and the truck was diagnosed by Powertrain at the Tech center, along with the best diesel dealer in the area. I've already lost close to thirty days due to the unavailabilty of parts and I've started my lemon law case. They condemed my injectors by doing a leak down test and both were in the area of 4.5 at idle and 5.9 while driving. the rest were .5 and .9





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Just got a call from my dealer with more bad news. Turns out they have the wrong injectors. He said GM switched the part number and they are now offering new ones. They are now putting my truck back together with the originals and giving it back to me. WTF. Looks like another week or two to get the "NEW" ones in. SOB. http://www.dieselplace.com/forum/smileys/Angry.gif

Mine was doing the same thing as i posted earlier so when the stealer did the first oil change at 3,000 miles they put a new fuel filter on it also, I am at 11,000 miles and it hasn't done it again.................yethttp://www.dieselplace.com/forum/smileys/Confused.gif

the dealer called yesterday I can pick up my truck , they duplicated the problem, the injectors, ballance problem but they have to order them it will be a few weeks. so I will drive the truck until they come in

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<TD id=HB_Focus_Element vAlign=top width="100%" background="" height=250 UNABLE="off">28 days and counting still no answers or fixes</TD></TR>
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GM calls me every day to tell me that they are trying to schedule for a field engineer and a regional service manager to coordinate on a time that they can test drive and diagnose my truck. Its starting to feel like lip service. I am beginning to think that they know what the problem is but aren't willing to spend what it will cost to repair all these LLY's. If they are like the engineers at my work (also GM) they are looking for a band-aid fix that just masks the problem. Hope I am wrong.

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<TD id=HB_Focus_Element vAlign=top width="100%" background="" height=250 UNABLE="off">I think your spot on....The dealer and the Customer care agent told me today they have no idea whats wronge or where to even start looking </TD></TR>
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Mine started this rough idle sh#$ today, but I didn't notice any smoke.

Had the same symptoms, took it to the dealer and they replaced 3 injectors. Problem solved.