I hope that someone can help me with this problem. Today I was driving along at 65 mph, cruise control and A/C on. I noticed a “tinny” ticking sound that was different from normal. This went on for about 3 miles. I drove under an over-crossing on the freeway and the cruise control started to compensate for the incline. The truck seemed to be a little doggy. As it reached the top it sounded like someone was hitting a steel table with a hammer, about 3-4 hits. I saw in my rear view mirror a cloud of black smoke. After that it ran rough for about a mile. No warning lights came on and I slowed down and drove to the dealership that happened to be 2 miles from where it happened.

The tech with his Tech II computer could find no problems. Off I went to unload my purchases and to get the family. About 25 miles later my wife asked me if we were hearing the noise that I had described to her and I said it was. Soon I drove under an over-crossing and you guessed it, “Bang-Bang-Bang-Bang”, LARGE puff of black smoke. This time I called the dealer and brought it back to them to keep until they found the problem.

1) I was told bad fuel. They checked the fuel the first time.
2) Could be machining debris in the line/injector.
3) Could be software problem.
4) Could be Turbo vane solenoid.

Any ideas? Thanks in advance.http://www.dieselplace.com/forum/smileys/Hug.gif

By the way, the odometer was at 995 miles when it first happened.
http://www.dieselplace.com/forum/smileys/Confused.gif

Where are you in CA?

Sounds like what my truck did today, I was accelerating on a freeway on-ramp with about half throttle and at about 50 kph RATTLE,RATTLE,RATTLE and a large cloud of black smoke.The whole episode only lasted about 5 seconds, This is the only time it had done this, The truck only has 4500 kms on it.
Let us know what your dealer eventually finds out !!

To socaldieseltech - Sacramento area.
To Bigf00t - I will. If you have the same problem again and have it looked at, please post your solution.

You two should try a fuel additive. The standadyne stuff, your dealer should have access to it. Tell them to give you a few bottles of it. Word is the tolerances are too tight in the injector tips, the fuel knock and black smoke should go away after the injectors "break in". In the meantime, I would recommend the additive fo the added lubricity, and see if that helps.

I sure hate to be the one to tell you what GM couldn't fix mine that was doing the same thing!! My dealer didn't have any problems getting the truck to smoke for them. With their computer hooked up they found that the #8 injector was dumping fuel. They replaced the injector, two computers, checked every wire for a bad connection and pulled a lot of their hair out looking.


I can make it smoke and I can make it stop. If I drive it on the freeway first thing after it is started after getting to freeway speeds and then pulling a small hill or anything that causes the need for a little more power it will rattle like spark knock and smoke like mad. Enought smoke to stop traffic on the 5 freeway!! Run the truck around town for a while(5-10 miles) and then get on the freeway and it doesn't smoke. If it is smoking the only way I can get it to stop is to pull over and let it idle for 10 mins and it seems to clear up. Mine started at around 550 miles, the first time I got it up to freeway speeds.


GM is replacing the truck as we speak with a 05. Please send me an email as I have 4 guys here in CA with the same problems. My dealer worked very hard to fix the problem and after a few rounds with GM they came across with the replacement.


I have heard about adding something to the fuel might help but I haven't tried it nor did the dealer. If it was an easy fix GM would of put a whole tank of the stuff it to try it.


Keep a record of everything so you don't forget any details and don't let your dealer tell you it is your fault. These are one of the best trucks on the road when they are running well!!





Dennis

socaldieseltech, I have been using Stanadyne additive since
day 1. I also have the Racor pre-filter system on my rig all in hopes of avoiding this very situation. I really hope this is just a break-in "thing".
As a side note, My truck also uses about 1 1/2 litres of oil in the last 3000 Kms, Is this a normal amount of oil comsumption within the break-in period ?

Bigfoot, way to go. I think you will be pleased with the results. Whats 3000kms in miles?

Thats about 1864 miles.

So, do y'all have an oil saturated filter like a K&N? Mine was doing the same thing, the dealer showed me the service bulletin, told me to take it out (they're not allowed under warranty according to the bulletin), and clean off the MAF sensor. They can fix it for you if you want to pay for it.


They say the oil from the filter can get on the MAF sensor and keep it from accurately reading the air. Thus the computer puts a bad fuel mixture, and you get crappy performance.


It was almost like magic. It's running as strong as before (I didn't notice much difference with the K&N anyway).

Mine has the factory filter and its still clean as a whistle !!, aside from a few pebbles and twigs

Just had the same thing happen to a friends friday night his hose clamp on the intercooler blew off put it back on and all is well ??? Maybe it worth checking for you to Turbo6600

Thank you Turbo6600,

Can't hurt to look. Told the shop to keep it until they fix it. Hope it is that simple. http://www.dieselplace.com/forum/smileys/Approve.gif

For those who have had this problem, how many miles are on the truck? Mine started doing it @ 1000 miles. I now run Standyne Diesel conditioner @ it is helping. Have 900 miles since, and it only happened once. Also it was not as bad. Hopefully it will clear up.

Just picked up the sick pick-up. The tech could find nothing wrong. Used up about 60 miles worth of fuel. Seemed to run fine. Much smoother and quieter then before. Could they have added a fuel conditioner??? What happens when a fuel conditioner is added??

I don`t think the fix is that easy...As I have posted previously, I`ve been using Stanadyne conditioner religiously since i picked up the truck from the dealer day one and i still had the problem.I hope it`s just a break-in
situation as socaldieseltech suggested.

Truck went back to the shop again this afternoon. Wife was driving it on the freeway with the cruise control on at 65. She said it took a good mile to clean out and smooth back up. This NEW truck is really pissin' me off.

That really stinks, Mine has been behaving lately...
just waiting for the "other shoe to drop".It`s kind of pathetic when you anticipate your new $40k truck to fail.I hope this time they actually solve your problem. Stick to your guns and dont accept the truck back until they asure you its fixed. Good luck !!

P.S You might have to change your sig soon hey http://www.dieselplace.com/forum/smileys/Cry.gif

Called the service dept. late today. They drove it last night, this morning and this afternoon. They could not get it to happen. I asked if they had an extra data collector handy that could be hooked up to the truck. They were going to check if it was compatable with the computer on this model/year truck. Hope that they solve the problem or at the very least, find the problem.

I developed the same symptoms @ about 8700 miles it started http://www.dieselplace.com/forum/smileys/Throw Up.gif: 60-65 miles per hour, sudden onset of loss of power, bucking and kicking like a mule, constant black smoke, get on it changes to blue-grey smoke, and rattles like a run on "dieseling" gas engine. Have had it into the shop. Were able to duplicate. No codes. Shop sent message back to corporate to get advice... Waiting for word. Now have about 10,000 on truck how long is this break in period suppose to be?


Service says to keep on driving... But all that smoking oil can not be good on the Kitty, I hope they have plans on replacing that as well.


Still love the truck though. Rented Dodge while body work being done. POS - fit and finish was poor, doors whistled, and the rear seats for it being a crew, were of little more room than that of a GM extended cab. Furthermore, the truck was quite sparten for being a SLT.

New D-Maxx.


Have you found out the problem with your truck. Has not happened on mine since I started using fuel conditioner. Also, not using just any gas station. It is funny, when I tow my toy box, all the worries go away. Still love the truck

No Duramax1, at this time it has not faulted. It must know that big brother is watching with the data recorder. Today was very cold for around here. Low 70's. When I had the problems temps were from 85 to 98. Today the trans. temp was 140-150 and engine temp was 180-190. Too low compared to the times it faulted.

Have been in contact with an engineer at GM. Hope he can help.

HHMM, mine lost power today at about 70 on the freeway engine was upto about 160 degrees, when it lost power (felt like it was not getting fuel) I gave it more throttle then a huge puff of smoke and it ran fine the rest of the 45 miles to work! 11,000 miles and not one problem till today. Used primrose since day one and added nictane at 8,000 miles. Wierd.

I had the same thing happen this morning. 80 mph in 5th gear cruising truck started to sputter kept losing power. Puffed out blue smoke. Kept doing it for about 2 miles. Plugged the DTC scanner in and no codes. Pulled off the highway. Filled the tank with fresh fuel. Checked the oil, trans, intake everything looks good. Started it back up and ran fine the rest of the way to work (45 miles). Still no codes. I have always had a dead spot in the pedal in 5th and it occasionally slams 5th at cruise speed (70-85) without downshifting. WTF?


mine is a 2005 Dmax/Alli 4x4 with 1,550 miles

This came from the GM TechLink site.

<font color="red">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.

</font>

Not sure if it helps but is certainly worth a try.

wow same exact thing that is hapening to mine...i have 7800 miles on it and in the last 3 days its happened 2 times........i unplugged the juice/attitude, filled up the tank, got on the freeway and it would not smoke, stutter or anything.................this is weird.....

Seems I solved mine...


Bad diesel!!!


I had though that the diesel I had been pumping from this one station smelled sort of strange... kind of like moldy. I have not filled up there for three tankfuls: no more cough, not more sputter, no more smoke, all the power, and 1.5 mpg better mileage.


All I can say is be careful what you pump. The station in question was selling diesel for about 10 cents less a gallon than every one else. Was that way for two weeks then POW, 10 cents more than everyone else. They knew they had some bacteria laced s**t for diesel that they were off loading cheap, and I was the stooge, who even went back for seconds.


Live and Learn!

I have noticed this too. Put bad diesel in and the engine is twice as loud as before. I haven't had the problems listed above, but did noticed the difference in diesel. I now fill up at truckstops or anywhere they sale in high volume.My mileage jumped up by 2-3 MPG by doing so. It makes a difference!!


Mike

off to the dealership tomorrow.............woooo hooooo

I too have had my truck in several times for rough Idle. Today while I was in there someone else also with a lly was in for the same problem. We teamed up on the service manager and guess what two hours later they found that injector #2 was bad and egr sensor and they are replacing both. I hope this fixes the problem. Are they suppose to change all 8 though????

My new duramax is in for same thing, mech at dealer/stealer say excessive back pressure in turbo caused by software/computer failure. 10 to 12 days to replace is there is no stock anywhere in North America have had truck 6 day!

Replaced #2 Injector today. Ran great for about 10 miles. Then
the same old c--p. Stumble, Stumble, Knock, Knock smoke.
Not just once but several times. Had some poor Ninja rider
smoked out. Everybody slowed down and stayed 1/4 mile
behind me. Called the dealer, turned around and brought it
back. The poor tech (he is as frustrated as I am) drove the
pickup again with the tech 2 connected and about 1 1/2 miles
from the dealer it happened to him on the return trip. He got
several snapshots but it still showed no trouble codes. They
were compiling all the paper work on the pickup as I got
another ride home. Something will be done this time one way
or another. This is GM's problem, not mine.

Carl

New D-maxx, have you tried additive yet.

No Duramax1,

I have not tried it. Why should we (Duramax Owners) have to
spend more money on a fuel additive when my fuel has been
tested and is within GM's specs. If they cannot build a diesel
engine to work on fuel that is available HERE and NOW,
maybe they should throw in the towel and chalk this one up as
another GM diesel failure. http://www.dieselplace.com/forum/smileys/smiley7.gif . Or they should provide a
lifetime supply of an approved additive for EVERY Duramax.

Sorry if I sound Pi--ed but I am. I did not spend $45,000 for a
pickup just so I could get to know the Service Manager and the
Tech on a first name basis. I am sure they watch the clock
when I leave and keep their fingers crossed for about 20 min
after I leave the shop.

What do you mean it is within GM specs? A specific gravity test? Just because your fuel passes that test doesn't mean its not junk. I see that Thrifty gas sells 92 octane but I sure ain't gonna run that in my hot rod. I think you should try and use some additive and at least rule out that problem. Why should you use additive for your fuel?? hmmm.....Why do some choose synthetic lubricants? Why do some add extra fuel filters?

I understand what you are saying, but If all I have to do is add some additive &amp; the problems goes away, then add away. I am pretty sure there are a lot of Duramax owner's that never experienced this problem, but run additive anyway. It is really not that hard to believe that the fuel is the problem. I still do not regret buying Duramax over Ford &amp; Dodge. I think you should atleast try additive &amp; go from there, you will not regret it.

I am having a hard time believing this is a fuel problem! If it was fuel wouldn't it run bad all the time? I am not the only guy here in San Diego County with a D-Max and I bet there are a thousand here that run fine on the same fuel day after day. I get my fuel from more than five different locations and I can always count on the smoking and knocking. I bet when I pick up my 05 next week and keep putting the same fuel into it the knocking and smoke go away. Will I sure hope that is the case! Also why would it always be the same injector even after being replaced? The fact that we have been hearing from guys on the other coast with the same problem also has me thinking. I also think it it was that easy of a fix GM would of sent us cases of the stuff by now to keep us out of the shops!! These injector repairs and replacement trucks have to be costing them millions.


My 05 will be number 3 D/Max and the saying 3 being a charm is what I am looking for!!

Well if you don't "believe" it, what else is there to say? I have put additive in trucks with the problem you are having, DURAMAX1 fixed his problem with it and so did NORCAL2500HD. What more is there to say? One day it knocked, the next day they put in additive and it hasn't happened since. How do you explain that if the only change that they have made is fuel additive?

Wellllllll......As stated in my previous posts on this subject, I have been using Stanadyne additive since day 1 on my rig.......


No Difference at all, It has "acted up" 3 times now in 5000 kms with no codes and a whole bunch of GM techs scratching their heads !!


The quest for a cure continues.........

So have any of you noticed a change in fuel mileage from one station to the next?


I guess I assumed that all diesel was the same....but I absolutly get better mileage with all things being equal when I buy from two of the four fueling spots that I frequent.

2nd take of stanadyne and no problems yet.........Edited by: NorCal 2500HD

Socaldeiseltech,


I do believe you that using Stanadyne makes most of the engines run better!!! I also think that it is doing nothing more than masking the real problem. Kind of like being allergic to your new cat but if you take a pill you feel better.


For the time being I think adding Stanadyne may be the only way to get these engines running well for some guys but in the big picture there are way to many running fine without adding anything and using the same fuel. Thats the part I don't understand.


Dennis

Any updates. How are the trucks running?

I have had no problems since I dumped the bad diesel...


Cheaper diesel is not always better!!!


-DLA

My truck has been perfect since mid-August when all eight injectors were
replaced. i have since had the re-flash done just because I was curious to
see if it made a noticeable differance. I have noticed a slight change in
sound. It seems a little louder when cold but I suspect it really has to do
with the colder mornings here (Buffalo) than anything else.

I've bought my fuel from quite a few of stations. Mostly ARCO and
Chevron. I have not noticed any difference between stations with
mileage or performance. My truck has been trouble free since I
purchased it in February which was 12K miles ago.

since putting in the stanadyne I havnt had 1 issue at all....still goin strong

hey guys my name is dennis and i'm new to this site but not new to the diesel world i'm a mechanic (diesel) for the past 21 years. i've tryed and or worked on just about every thing out thier and can honistly say i am driving the best diesel i've ever got to drive!i have tryed the ford new and old and what a disaster one turbo after another trans blow out like i change my sox, had the cummings (which i work on all day long is having pump and injector problems like you wouldn't believe) (it's paying for this new truck) ha ha .I too have had some of these problems with mine but i have found it to be fuel related,first trip with mine was to las vegas when i had only about 1200 miles on truck. truck was fine on the way there ,but on the way home ran hot ,smoked had no power basicly just SUCKED and i felt like most of you do .When i got my truck it was the first one released to cal,and know one had even seen one ! took it to the dealer and they could not find any thing wrong ran the truck for a while and it ran great ,then the wife drove it and it happened again so this time i checked it out and found the fuel (she) used was contaminated i ran 5 tanks of additive through the engine and trucks been fine ever since and now has 23,459.9 miles and counting and i pull 16,400 hunderd pounds all the time ,the only thing that is done to the truck is a filter the new airhog by fram it is basicly the same as the kn and (DO NOT OIL THEM ) it will give you many new headaces .I do hope this helps you try to calm down about your investment (45,000) or so. all i can tell you is you definatly made the best choice out there and if you pay attention to were you get fuel you will have a better time with your truck! if any one out there has modified there LLY please give me some feed back as i'm looking in to that now,thanks dennis

Norcal, good to hear your truck is doing great. Bigdusa, thanks for the support. My truck is running good. Waiting for Six-gun.

I had this problem start last week - Stock '04 LLY. Took it in today - the fix was to reprogram the ECM. Will have to see if it works.





carl

I had this problem start last week - Stock '04 LLY. Took it in today - the fix was to reprogram the ECM. Will have to see if it works.





carl





I had the reflash done to mine and it stil didnt fix it.........buy some Stanadyne and you shouldnt have the problem again.......I havnt

No problems since Sept. 30 post. I have been buying diesel at
a truck stop that was recommended by several trucking friends.
The first time I stopped at this place, there were 10 big rigs and
3 pickups filling up. This is ALWAYS happening whenever I
drive by there. Best part, they are $2.32 +- and the other diesel
stations in my area are 2.49 to 2.54. (Small miracles).
Cheapest price, VERY high volume.

A Different Nor Cal Carl
http://www.dieselplace.com/forum/smileys/smiley17.gif

Dealers with high volume is the only way to go if you don't want to add Stanadyne or simular at every fill. By my observations on this forum, we out here in the west (California, particularly) seem to have it the worst, the most bad diesel.


Now the only question is... Why are we paying the most?!?!?!?


-DLA

History: Truck started rough idle and smoke at about 6,000 miles. Took to dealer and told them I thought it was injectors. I got the eye roll from the service manager, they looked at it and said it was probably bad gas. Problem worsened. Took truck back about the time the calibration fix was out. The recalibration fixed the truck for about 3 weeks. Took the truck back in last Friday. Dealer calls and says it needs two injectors replaced. I get it back today and will report. I have run Stanadyne in it since new. Not real happyhttp://www.dieselplace.com/forum/smileys/smiley19.gif

I HAVE HAD SIMILAR PROBLEMS AT 750 MILES - KNOCKING- SMOKING- LOSS OF POWER. THEY FIRST TRIED A REFLASH , PROBLEM HAPPEND ON THE WAY HOME FROM DEALER- REFLASH DIDNT WORK . STARTED TO USE STANADYNE AND HAVENT HAD A PROBLEM SINCE. AT ABOUT 1200 MI I LIFTED MY TRUCK WITH 38 INCH TIRES AND ADDED EDGE WITH ATTITUDE , EXHAUST, I NOW RUN MY TRUCK IN LEVEL 2 AND 3 WITH AN OCASIONAL LEVEL 4 , AND BEAT ON IT WITH NO PROBLEMS. I NOW FILL UP AT THE SAME STATION EVERY TIME AND WITH 3500 MILES ON TRUCK I AM CONFIDENT IN MY TRUCK PERFOMING WELL BECAUSE OF THE STANADYNE ADDITIVE. I DONT THINK WE SHOULD HAVE TO ADD ANYTHING BUT IF WORKS I WILL ADD IT. JUST MY .2 CENTS

update- latest fix is if tech is able to disable injector and make smoke stop, change the injector that is next in firing order. I have always changed the injector that I could disable and make the smoke stop, they want me to change the next one in the firing order. Haven't been able to try it yet though, because I have only been able to duplicate the problem on a couple trucks, usually I just take the customers word for it and hand out some stanadyne and send them down the road, since there has not been a repair available. Field engineer gave me this info. Disclaimer- this info could be reliable, but not guaranteed!!:D