i had a fuel knock develop in my 04 dmax. brought it to the dealer who tore down the engine completly. they are replacing piston 8 because this is where the noise was coming from and injector 6 7. due to uneven fire pattern. they are also replacing all the main bearings as they look scuffed. i used gm oil at first then switched to rotella. neither will go back in my truck again as the truck only has 30000miles on it. i never haul with it and no after market crap ever on truck. dealer said the engine is at its limit for power from factory and will not last with power upgrades. i believe them after seeing the bearings on mine.

i had a fuel knock develop in my 04 dmax. brought it to the dealer who tore down the engine completly. they are replacing piston 8 because this is where the noise was coming from and injector 6 7. due to uneven fire pattern. they are also replacing all the main bearings as they look scuffed. i used gm oil at first then switched to rotella. neither will go back in my truck again as the truck only has 30000miles on it. i never haul with it and no after market crap ever on truck. dealer said the engine is at its limit for power from factory and will not last with power upgrades. i believe them after seeing the bearings on mine. next truck will be a gasser.
:funnypost :rolleyes: :rolleyes: :rolleyes: :rolleyes: :rolleyes:

your turn will come:D

WOW! If this was more common I would expect to see more posts like this. You can't be serious?:confused:

im very serious man, shocked the hell out of me too, but i saw it with my own eyes. the rest of the injectors had rust on them. i also changed the oil every 5k.

phazar - Believe it or not, your truck is the exception, not the rule...
Evidence?
GM has been putting the 6.6L duramax in trucks since somewhere around september of 2000 (Of course, these are called 2001 models)
Keeping that in mind, there's how many of these on the road??
Also, while a good plenty of them are stock, many have been hot-rodded as well...
Trippin (a member here) has well over 150 dyno runs on his truck, and we all know he hasn't run stock in a long, long time...
I would venture to guess that at least 30% of the memebership here has a power upgrade of some sort done to his/her truck...
If this was a common occurance, you'd see all kinds of posts about it..
So, you had some bad luck....Good luck with the truck in the future, or whatever you decide to replace it with..

Yeah...shame on you guys for modding your trucks....lmao....:)

Did you ever do an oil analysis? Something was obviously wrong with the constant knocking from the bad injector. A lot of stess was placed on components, resulting in accelerated wear.

The corrosion on the injector fittings seems to be common (though not necessarily a good thing).

I have aftermarket stuff on mine. 4'' exhaust predator stacked w/edge k@n filter. And i haul one heavy a** trailer 3 times a week! 47k and still has not been in the shop for one problem. OHHH wait a minute!! My power mirror went bad on the driver side. Fixed under warranty. My truck was a play truck. Now it makes me $$$$ Not only does it haul a 18-24k trailer. But i also rod i to. HELL i even bump the power up when im pulling the trailer.( like to see black smoke) And still starts for me time and time again. So dont beleive the dealer when the say your truck is max power stock. Not true!!!!

Hi,

And don't blame the oil, 'cause if fuel was getting into it, it doesn't matter who's name is on the bottle, the bearings will eventually give!!

Take care and good luck!!

Will

Well I guess with "triple" the stock power in my truck ):h that mine should be ready to fall apart.. Guess I better get in line to get it worked on...:rolleyes:

Sounds like a one time deal. The Duramax is one heck of an engine. That in stock or modded form can really take a lot of abuse. Tough Luck, but with the # of engines out there being pushed to the limits (drugs, big turbos big boost#'s) I am quite frankly impressed with the design.

HOWEVER.... I was going to say when the GM Beancounters get their mitts in this engine I bet they will F it up big time. In the LLY they have made a step in that direction.... yes there are improvements, but some of these improvements are limiting the performance potential (so far)

Typically GM has an engine that is 'too good' and shcans the whole deal after it enjoys some success. 327, 396, DZ302, L-88, 231 Turbo, MMZR-1,

I'm waiting for the 403 DMX to be 'significantly redesigned' by GM into unreliable obsolescence.

Well I guess with "triple" the stock power in my truck ):h that mine should be ready to fall apart.. Guess I better get in line to get it worked on...:rolleyes:
You have 726 RWHP?

My HERO~):h

Sounds like a one time deal. The Duramax is one heck of an engine. That in stock or modded form can really take a lot of abuse. Tough Luck, but with the # of engines out there being pushed to the limits (drugs, big turbos big boost#'s) I am quite frankly impressed with the design.

HOWEVER.... I was going to say when the GM Beancounters get their mitts in this engine I bet they will F it up big time. In the LLY they have made a step in that direction.... yes there are improvements, but some of these improvements are limiting the performance potential (so far)

Typically GM has an engine that is 'too good' and shcans the whole deal after it enjoys some success. 327, 396, DZ302, L-88, 231 Turbo, MMZR-1,

I'm waiting for the 403 DMX to be 'significantly redesigned' by GM into unreliable obsolescence.
I assume the GN 3.8 turbo is in the codes there somewhere..... I remember chevy *****in up a storm in 87 that the Production buick GN was faster than the corvette, general motors' signiture go-fast machine!!that was thefastest produciton car of that year....if memory serves.......

Juice...I hope you are not right!!!!! Hopefully the lly will pan out. From a bombers stand point the only thing holding us back is the fuel supply issue. The new vvt looks like it is a strong unit....as strong as the IHI....time will tell I guess.

I assume the GN 3.8 turbo is in the codes there somewhere..... I remember chevy *****in up a storm in 87 that the Production buick GN was faster than the corvette, general motors' signiture go-fast machine!!that was thefastest produciton car of that year....if memory serves.......
I can't remember the RPO#, but it is there. 231cu in of turbocharged powerhouse.

Rated at an obscenely low 280HP):h Buick unleashed this G Body terror as a last hoorah for GM's beancounters retooling and closing the line. Perhaps it was because Bowling Green KY (home of Mr Plastic Fantastic or is it RTM?) was a little peeved that the Buick was killing them in straight line performance?

I Digress. There were some 15 mules also built, a GN Staition weapon, and IIRC a FWD one, all pushing a conservative 380 HP until Motor Trend stuffed the FWD one into a wall):h

ASC McLaren also built ???#'s of the GN-X Again, 280 HP but with CAC upgrades and ECM changes AND a ceramic turbo!:eek:

Rarest of the rare. And for the final bow out, the remaining engines were put into the 1989 only Indiannapolis Pace Car Trans Am. 1500 total production
The 200r-4 had its work cut out for it!

Juice...I hope you are not right!!!!! Hopefully the lly will pan out. From a bombers stand point the only thing holding us back is the fuel supply issue. The new vvt looks like it is a strong unit....as strong as the IHI....time will tell I guess.

You and me both. But look at the decontenting of the trucks!:eek:
Why?
What is next?

I'm just waiting for GM to really step in it. Ford did with the 6.0.
Internationals version has been trouble free.


I pray that GM is reading this.... and takes some advice.

For example, for a diesel catalyst to be more than 32% effective it needs urea to completely turn NOX inert.

But we have one?
Why?

The VVT turbo is cause for celebration, although it does decrease emissions under all circumstances.
But why the EGR?
EGR shrinks displacement.

Why the 1093's?
Injecting fuel later in the comp cycle does burn well and reduce black smoke emissions, but it actually increases NOX! Therefore a catalyst has been added

See where i am going with this (because i sure as heck don't;) )

And why is the LLY less fuel efficient? Better emissions at the cost of GREATER fuel consumption?

I'm sorry, but that is not how it's supposed to be in my opinion.

The 70's muscle cars were horribly inefficient, but when emissions were added... same thing less power worse MPG.

In this computer age it is irresponsible in the extreme in my opinion to rob peter to pay paul. Better emissions vs fuel economy...WTF is wrong here?

There are other solutions but they cost $$$ to implement.

Anyone want to hazard a guess why intercooling is standard on diesels now?
Because them aluminum chunks cost some big $$$$?

It is for emissions FIRST! Power gained was only a side benefit.

There are engineers at GM Ford and DC that would sell thier own mothers for a CAFE increase of .1 MPG!
These same guys would also sell their favorite sheep for .03 g/m reduction in CO2 in their respective stables.


Ok, RANT over.

from my exp, its only a matter of time until it lets go,$$$$$$$$$$$$$$$:D

The CATs on our trucks are for Soot reduction. The EGR lowers combustion temps to reduce NOX. Starting in 2007, the situation may change.

I assume the GN 3.8 turbo is in the codes there somewhere..... I remember chevy *****in up a storm in 87 that the Production buick GN was faster than the corvette, general motors' signiture go-fast machine!!that was thefastest produciton car of that year....if memory serves.......Yea, FWIW, I did hear of this also. I'm one of the fortunate or unfortunate ones (hehe) to own a GN. These cars are truly amazing. I'll go to the camaro website every now and then and listen how they want their cars to go 12's or 11.99. I guess that my GN has spoiled me, my car is a 10.70's car that has A/C and all of the creature comforts and I'm wanting more.<?xml:namespace prefix = v ns = "urn:schemas-microsoft-com:vml" /><v:shapetype id=_x0000_t75 stroked="f" filled="f" path="m@4@5l@4@11@9@11@9@5xe" o:preferrelative="t" o:spt="75" coordsize="21600,21600"> :D <v:stroke joinstyle="miter"></v:stroke><v:formulas><v:f eqn="if lineDrawn pixelLineWidth 0"></v:f><v:f eqn="sum @0 1 0"></v:f><v:f eqn="sum 0 0 @1"></v:f><v:f eqn="prod @2 1 2"></v:f><v:f eqn="prod @3 21600 pixelWidth"></v:f><v:f eqn="prod @3 21600 pixelHeight"></v:f><v:f eqn="sum @0 0 1"></v:f><v:f eqn="prod @6 1 2"></v:f><v:f eqn="prod @7 21600 pixelWidth"></v:f><v:f eqn="sum @8 21600 0"></v:f><v:f eqn="prod @7 21600 pixelHeight"></v:f><v:f eqn="sum @10 21600 0"></v:f></v:formulas><v:path o:connecttype="rect" gradientshapeok="t" o:extrusionok="f"></v:path><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:lock aspectratio="t" v:ext="edit"></o:lock></v:shapetype><v:shape id=_x0000_i1025 style="WIDTH: 12pt; HEIGHT: 12pt" alt="" type="#_x0000_t75"><v:imagedata o:href=\"http://www.dieselplace.com/forum/images/smilies/biggrin.gif\" src="file:///C:/DOCUME~1/Steve/LOCALS~1/Temp/msoclip1/01/clip_image001.gif"></v:imagedata></v:shape>

Yet another reason to have oil analysis run on a regular basis. I do mine every other OCI.

When we bought our truck used the oil pressure took a dive and I found about 20 qt of deisel and oil in the pan. Couldn't tell by the level on the dipstick, it was too high and too clean. Changed the oil and the same thing happened again. Finally fixed the problem about 50k ago, had an anaylisis done on my last oil change 15k on the same oil and filter and it came back excellent and could have gone farther. A bit of fuel in the oil won't hurt a bit over the short term. Sounds like you had some serious engine problem probably from manufactoring or bad injector. Definitely in the minority

phazer what drugs are you or youer dealer on max power you got to be kidding o

im just telling you what i saw and what my master tech of 23years is tellingme, i trust his opinion more than someone who never saw the inside of the dmax engine. no i dont do drugs, its bad for the health looser.:D

There are a few guys on here that have ran with a lot of deisel in the oil with no damage that phazar talks of. Ours is coming up on 150K with no engine problems at all. I don't have to add oil during a 10K oil change and my pressure is right up. BTW my fuel leak was loose return lines, still on the orig. injectors.

32000 of serious abuse on an LLY and runs like a clock.

IMO, the LLY will be the "hot rod" version of choice for the Duramaxes. With better injector access, circuitry to enable VVT's, and more RAM/Faster ECM, there is no downside at all.

When Banks decided to build up some monster Duramaxes, do you think they started with LB7 engines? If you think so, think again.

i had a fuel knock develop in my 04 dmax. brought it to the dealer who tore down the engine completly. they are replacing piston 8 because this is where the noise was coming from and injector 6 7. due to uneven fire pattern. they are also replacing all the main bearings as they look scuffed.
Whats wrong with the piston? Nothing I bet. Uneven fire pattern?! That sounds really funny! I'll have to use that one. Lets see some pics!!! I've seen MANY fuel knocks on a dmax, never did I go after a piston!! Did they replace the injector first, or just go right after the internals??:nopics:

Sounds like somebody is trying to :stirthepo

You can buy the most expensive/reliable vehicle on the road and still end up with a lemon. Hell if you took every vehicle story to heart, you wouln't want to buy a GM, Ford, Dodge, Honda, Toyota, Lexus, BMW, Porshe, Rolls Royce, etc.

You can get a Monday/Friday vehicle from any manufacturer.
Hell, the aluminum head scare never really panned out. I think it was a Cummins lover doing to much of :sheephump and trying to scare the GM guys. All major manufacturers have had issues. The only "problems" it seems with the Duramax's is a limited number of injectors (which GM is replacing) and other manufacturers using Bosche seem to be having similar issues. For guys running stock, you can't beat the realiability of the Max/Ali combo. Dodge and Ford are making big strides but there autos still can't touch the Ali. Yes the NSBU switch was an issue (but shouldn't have left anyone stranded).


Anyone who thinks the Max motors are junk (as a whole) should be :smashfrea IMHO.


If this offends anyone :sorrysign

Everybody can have their "opinions" but using one instance to try to prove fact is irresponsible :badidea: . [rant mode off] 12 15 12 :Nothing_f :iamwithst

Leadfoot ~ Think you've hit it

I wasn't aware of dealers having authority to go 'into the internals'. I know when I purchased my 02, the complete eng would have been replaced ~ has policy/skills changed/improved at the dealers shop level?

Yeah its not the oil........

I went 535,000 miles on my 4 banger grand-am with regular valvoline.

If your not using an additive like primrose 405 thats why you got rust.

Id say one or 2 injectors werent right and tore the engine up.

your right, the truck is perfect now after two injectors replaced along with piston 8 .

I have a little difficulty with the theory of diesel in the crankcase washing out the cylinders. Many of the injector failures talked about on this page for the past 3 years have lead to vehicles being driven for a while with diesel in the crankcase with no apparent cylinder or piston failures even two years or 100,000 miles later. My own 02 D/A lost two injectors at 70,000 miles a year ago while in Guadalajara Mexico, and I drove it home 3500 miles on diesel for crankcase oil at 20 lbs or less oil pressure at 70+ mph while the vehicle was over loaded with stone, weighing about 14,000 lbs. Engine never got warm, much less hot, and never stumbled, just blew lots of diesel/oil mix out the overflow and coated everything in back of it. Put in new injectors, and the vehicle is still going strong today with no apparent effects. Still runs the same high oil pressure as before the injector problems, uses no oil, and runs great. Other than injectors and fuel delivery system, the Duramax has been a great dependable diesel motor, especially the LB7. All Gm had to do was solve the injector problem, make them easier to change out, and leave the damn thing alone. Instead they gave us the LLY with slightly less power and considerably less mpg. Finally, I think, I have solved those problems making the LLY all it should be for normal HD use. If your piston was bad, which I question for many reasons (question the failure of the piston, do not question you or your opinion), it was a fluke and extremely rare. I have two Chev dealers that tell me they still are not allowed to open a engine, but neither has had to yet (01 to 05), and both sell a LOT of D/A's.

SO WHAT WAS THE TOTAL OUTCOME TO THIS THREAD??? DOES THE TRUCK RUN NOW AND DOES YOUR FRIEND HAVE ANY ISSUES??? Still not sure I am buying this, but just trying to play along...

can anyone give me advice on how to scan in my repair order so i can show you guys. should the dealer have changed all 8 injectors? do they have to and is there a tsb in regards to that?

IMO, the LLY will be the "hot rod" version of choice for the Duramaxes. With better injector access, circuitry to enable VVT's, and more RAM/Faster ECM, there is no downside at all.

When Banks decided to build up some monster Duramaxes, do you think they started with LB7 engines? If you think so, think again.
I think Banks picked the LLY's because of the redesigned ports in the heads, with better flow for the extreme power they are searching for. I didn't think any fo the other reasons mattered to them. I would think they will not be using stock turbos. I believe the variable vane turbo in the LLY is mainly for emissions, and no significant performance benefit. I think all LLY's come with cat converter's? From my limited knowledge of Duramaxes, there seems to be pro's and con's to each.

can anyone give me advice on how to scan in my repair order so i can show you guys. should the dealer have changed all 8 injectors? do they have to and is there a tsb in regards to that?

I thought you trusted your Master Tech of 23 years? Here you are questioning if he did the job right? :rolleyes:


Anyway, the 04 does not apply to the special policy or TSB. Only supposed to replace the bad injectors.

So what exactly lead the tech to take the enitire engine apart down to the bearings?

I think that Banks Chose the LLY iteration of the Duramax because it represents the current form of the motor that will be with us for the forseeable future.

When 'Competition Improves The Breed' is applied from a tuning company to a manufacturer's product, It reflects better to have it based on current technology rather than 'last years model that is no longer available'

I think that Banks Chose the LLY iteration of the Duramax because it represents the current form of the motor that will be with us for the forseeable future.


Yeah, you guys are right. I thought I read some where that the ports are diffeerent in the LLY heads, maybe not.

Hey cobra, the dealer thought it was a mechanical noise, thats why the tear down. I now have a quiet truck instead of a knocking engine. Anyone with advice on how to scan in my repair order to rectify everyones doubts on my word. It lists condition, all parts used, diagnosis ect, right from the dealer.:ro)

can anyone give me advice on how to scan in my repair order so i can show you guys. should the dealer have changed all 8 injectors? do they have to and is there a tsb in regards to that?

Go to the upper left hand corner and click on the blue THE DIESEL PLACE

Then scroll down to the topic VIN CHECK.

Post your vin. The technicians will handle it from there.

your right, the truck is perfect now after two injectors replaced along with piston 8 .

Ready to add some power now?

:funnypost :grd:

i think i had enough problems...:rolleyes:

whats up,dont want to see repair order? the truth with proof hurts eh?:exactly:

Uh, yeah let's see it.

On edit: Why do I get the feeling your trying to stir the pot.(trolling)

Post your VIN here and one of the techs can bring up the history http://www.dieselplace.com/forum/forumdisplay.php?f=72 Or if you post it in this thread one may stumble across it.

I have submitted my vin number, what next?

One of the techs will run the #, then will post the warranty history for all of us to see.

take a look, its there for all to see.............-:t

take a look, its there for all to see.............-:t

What's up with E5130 - SPRING ASSEMBLY, REAR LEAF - RIGHT - REPLACE and the other leaf spring?


These springs take a ton of weight, racing, pulling, etc with mucho power adders and no problems. Either you got the lemon of all lemons, or you are doing more with your truck than you imply (at least that is what the information on that little fact sheet states).

All i do with my truck is use it as a daily commuter except when hauling my twenty four foot power boat.The rear spring was just defective.

Man it sounds like you got a sour apple out of a pile. You have to stop listening to the dealer about stuff.

you may be right, but the truck works great now. I wonder why all the smart a$$ that called me a liar arent responding after seeing my vin report. :confused:

:confused: :confused: :confused: :confused:

We have a bunch of tuned to the hilt duramax diesels in our area that run great and have for 150,000 miles. That is a load of crap that the engine is near its max, every year as a marketing scheme they bump up the power a little more does that register with you?

:funnypost sure does, but i think he knows a little more about the duramax then you. you are just taking chances that i hope you can afford.

What in life isn't a chance that could cost you if it goes bad? Do yourself a favor, go for a ride in a modded Dmax & then I want to hear what you say then.