Ok guys i am fairly new to the forum i am a gm certifed tech. heres my problem i need to know how many more there are. in the shop i have a 06 lbz with a pulsing vibration at idle easily felt from drivers seat the intensity increases as it warms up i can also make it increase by raising the idle to the 1300-1400 rpm range. good news its not the engine as i have just replaced it per gm engineering fr the dmax plant has instructed me to. i know its not trans due to disconnected converter vibration still there. oh and the best part this was cought on pdi it only has 4 miles on it. any input i can get from owners may help me and gm find the cause of this
thank you.:confused: :confused:

did you replace the entire motor ( damper, flexplate, fan clutch ect)

Have you tried disconnecting the exhaust to see if the vib stays? Sounds like a ground out.

maybe it is the new measaging seats that are new for 06

yes i replaced all components gm engineering sent me an assemby line engine all cmponents included plug and play the truck has been run without exhaust converter disconnected new mounts eng and trans all #S perfect thought it might be cal issue programmed with 06 lly cal still same swapped ecm from another lbz and reprogrammed all same am scratching my head here area engineer returns for second visit tommorow but im not conviced he has any idea.

its a 6-12hz vibe at 680 and 1350 rpm ranging from .10 to .75 on the g meter
(eva 2)

I have noticed it on my truck. Never really gave it much thought. It is a pretty rythmic vibration, though. I have noticed the same vibration in a large International with a DT570 we have at work.

replaced ntire engine (assembly line eng direct from dmax plant) plug n play. ran with no belt converter and exhaust disconnected new monts eng and trans no change in vibration 6-12hz 680 and 1350 rpm .10-.75g's w/eva2. tried diff fuel checked balancer pin new and old eng. tried lly program no change tried new ecm no change theyv'e got me runnin in circlesand the area eng. will be back tommorow for ound two. at this point im into it 55 hours straight plus 9.5 hours or eng swap its not a sold unit thank god but im running out of patiece.
:help: :help: :help: :help: :help: any input is great the area eng said he went to the roseville dealer and checked all of their stock units and found 4 that di the same w/ only 1 at a comparable strength to the one ive got. its extremely noticeable immediatly after start up itll shake the mirrors.

[quote=JoshH;900124]I have noticed it on my truck. Never really gave it much thought. It is a pretty rythmic vibration, though. I have noticed the same vibration in a large International with a DT570 we have at work.[

when it warmed up does it get worse ? if you raise the rpm at a stop in ark to around 1300-1400 rmp do you feel it again? scale of 1-10 1 very minor 10 -moves your mirrors?? thank you for your reply whats you build date (on the door sticker) ? mileage?

It doesn't shake the mirrors at all. I haven't driven it for a couple of days and, to be honest, I really don't pay much attention to it anyways, so I can't say if it is worse when it is warm or cold. I can say it isn't bad enough to shake the mirrors or rattle anything inside the truck. I just kind of feel a little vibration in the seat is all. It was built 08/05 and the current mileage is a hair over 7k. I'll drive it tomorrow and get back with you on the other stuff I couldn't answer.

I have an 05 LLY and it has a vibration at idle in park. It comes and goes rhythmically. Almost liked a gasser with a big cam. I'm pretty sure mine is from the engine though.

that sounds exactly like mine i still swear its an engine problem but i would have to be two in a row thanks josh much appreciated

tech :
I would bolt the trans up to the new one and run it , if you havent allready .
Electronic controled engines require a large rotating mass ,(flywheel torque converter)so the engine does not hunt maintaining a specific rpm .
Try it you may like it.

:)

have done that right now its all together and has been driven newmotor is exactly the same.

shoot in the dark:

EMI from another electrical componant not on the engine as you would have replaced those.

also i had an old mustang with the fluid mounts that would vibrate like heck when i blew one wasn't easy to see but you sure could feel it

did the new motor come with a new injection pump and injectors? Could it be the fuel pressure regulator? can u ramp fule to 160Mpa's? just a thought

yes it came with all pump injectors and all injectors are programmed correctly
it will ramp to 180 balance rates good.

O yeah i forgot you have to program for each injector! thats just stupid. but realy the only thing it could be is programing or. there is a wire pinched somwhere giving the ECM a wrong reading. Could the FICM have gotten wet when it was PDI'ed or did that come new aswell. Also could someone have put gas in it when PDI'ed. iv seen that happen. stupid sales men

pooch you should really go look at a new o6 lbz no more ficm and the ecm is no longer delphi it has a bosch pcm and they program each injector to better meter the fuel to make cleaner and more power. and ive drained and refilled tamk w/new fuel no chance of gas in it it had only three gallons in it from the factory. but i tried new anyway in case of poor quality but no such luck.

Well you guys have covered alot of what it could be. I say cracked frame missing frame rivet bad frame cross Allowing a frame harmonic.??

Well you guys have covered alot of what it could be. I say cracked frame missing frame rivet bad frame cross Allowing a frame harmonic.??

I had the same thought today Tubeking.

Too bad you’re not near me. I could test drive it for a couple hundred thousand miles or so to check out if it has any long-term effect. :lol:

thats exactly what i told the area eng. today. he had me replace the exhaust no change i checked the frame no damage or missing/ poorlyinstalled rivets. now hes got me replaceing the converter even though i objected and i know that its not gonna fix it ive run it without the converter bolted up and it didnt change. so ill keep you guys posted i appreciate the response and ideas. any other people with a pulsing vibration at idle please feel free to speak up. also dont remember if i mentioned it but when at operating temp in park at aprox 1300-1400 rpm the vibration is horribl it makes thehole powerrain shake.:confused: :confused:

I checked today, but couldn't really notice it any. I didn't check to see if it did it really bad at higher rpm, but let me ask you a question. As you rev the engine does it progressively get worse or does it go away and then come back really bad at 1300-1400 rpm? If it progressively gets worse then I can say my truck does not do that. I have never reved my truck up that high sitting idling, but I know the vibration completely goes away at anything other than idle speed.

it does seem to get alot less noticeable or even gone as you rev up but theres a sweet spot between 1300-1400rmp that jumps out and says hello

I guess I'll have to check on that one tomorrow.

Have you moved the EVA transducer around to see if you can identify an area where the G-force increases?

ys i have that p.o.s. has givin bad every where the worst was at the t case and abs motor area on frame alon with frame around eng and trans mounts.

We had a John Deere Gator 3 cylinder yanmar diesel doing this exact thing, we replaced everything, engine, trans, fuel system, everything. Ended up being scrapped. Let me know if they scrap this one, I will take it off your hands. Sounds like they almost have enough money in the thing to just make a new truck.
The only thing I can think of is something missing, like a bushing somewhere, I had a Jeep that someone (me) forgot to replace with the suspension, it rattled like mad at idle, never under load.
Does the truck do it while running in gear at speed?

What about the ECM or even the TCM?

Have you considered running the engine out of the truck on a hardstand? If you could run the engine out of the truck, you could isolate the source of the vibration to either the engine (engine vibration still present on hardstand) or the rest of the truck and drivetrain (engine vibration not present on hardstand) ...

Also, which dealer in Reno are you representing? I live in Reno and I'm going to buy a new Duramax ... with a guy like you in the back working on trucks, I'll seriously think about buying a truck from your dealership ...

Thanks, Dave.

I have noticed a slight vibration on my 05LLY also at 1300 or so since new...
goes away at higher rpm....
Could be internal engine balancing with some engines being balanced better than or worse than others....

I have a vibration that can be heard when I first start it up in the morning it is not a very bad vibration but it is noticeable sounds like it is coming from the passenger side I really have not paid too much attention to it but I will now I really do not know if it is worse when it warms up or not but I will keep you posted.

Try running it off the exhaust manifolds, eliminate the turbo. Could be out of balance or something bent in the turbo.

Try running it off the exhaust manifolds, eliminate the turbo. Could be out of balance or something bent in the turbo.
That's exactly what I thought! He doesn't say that he has replaced the turbo. That appears to be the only rotating mass that hasn't been replaced.

I'd disconnect the turbo and see what happens.

its a 6-12hz vibe at 680 and 1350 rpm ranging from .10 to .75 on the g meter
(eva 2)

6-12Hz is equivalent to camshaft frequency at 680 -1350 rpm.
Are you shure that is the vibration that you are feeling?
(Shaking 6 times a second is quite fast to feel it as a pulsing vibration).

6-12Hz is equivalent to camshaft frequency at 680 -1350 rpm.
Are you shure that is the vibration that you are feeling?
(Shaking 6 times a second is quite fast to feel it as a pulsing vibration).Hmm. Could you explain that in english. The vibration I'm feeling, which seems to have gotten significantly weaker since my truck was newer, is a pulsing vibration that comes and goes in .5-1 second intervals.

These are diesel trucks right?Shouldn't they vibrate just a little bit?

thats exactly what i told the area eng. today. he had me replace the exhaust no change i checked the frame no damage or missing/ poorlyinstalled rivets. now hes got me replaceing the converter even though i objected and i know that its not gonna fix it ive run it without the converter bolted up and it didnt change. so ill keep you guys posted i appreciate the response and ideas. any other people with a pulsing vibration at idle please feel free to speak up. also dont remember if i mentioned it but when at operating temp in park at aprox 1300-1400 rpm the vibration is horribl it makes thehole powerrain shake.:confused: :confused:

Any luck with the converter swap?

you should go play the powerball i think you have the luck to have two bad LBZ's.

not to steal the thread but i'm in Northern Nevada too. i'm having trouble diagnosing my Dmax. i'm in Winnemucca. mine is cackling and stuttering and puffing white smoke every so often. they wont check injectors cuz it hasnt pulled a code. any of this in reno? thanx, pach

not to steal the thread but i'm in Northern Nevada too. i'm having trouble diagnosing my Dmax. i'm in Winnemucca. mine is cackling and stuttering and puffing white smoke every so often. they wont check injectors cuz it hasnt pulled a code. any of this in reno? thanx, pach

:offtopic:

What do you mean, "not to steal the thread" Then why did you?

ok sevaral questions to answer ill try not to miss any
yes the turbo was replaced with the eng it came as an assembly line eng all parts pieces and extras included no joke bolt it down bolt up converter
add coolant hoses intake hoses fuel lines and plug in harness turn key.

as for the converter change its coming from la was supposed to be next day but so muchfor that stall. ill let you know when its done hopefully tommorow.

the 6-12 hz is the vibe im feeling but the bad thing is it happens roughly every other second. (in english a hz reading is basicly a count of how many times something happens in a second.)

dont get me wrong the d max rocks and i love it but id like to burn this pos down to molten and start fresh.:muahaha:

Does this truck have the step bars? I thought I read some where about some of them hitting the frame, even though they were GM ones

....

the 6-12 hz is the vibe im feeling but the bad thing is it happens roughly every other second. (in english a hz reading is basicly a count of how many times something happens in a second.)

.... i love it but id like to burn this pos down to molten and start fresh.:muahaha:

Do you see a change in idle speed?

Did you check AirCon compressor activity?
Maybe the compressor clutch is switched every 0.5-1s ON-OFF-ON..
This would cause a frequenqently change in load.
Are there other major loads that could frequently change?

Could the power steering/hydraulic brake boost/brake controller be feeding a vibration back to the motor?

Have you run the motor with the belt off?

Out of balance fan blade?

Good Luck

has been run with no belt so no to the p/s and fan and a/c. jus changed
converter nope still there----oh well its a factory fluke not the norm i love the lbz its the best one yet but cant make an omlet without braking a few eggs its back to gm r&d for this truck thanks for the ideas guys dont let this scare you away from the lbz it is THE only diesel i would own !!!!!!
happy motoring guys

has been run with no belt so no to the p/s and fan and a/c. jus changed
converter nope still there----oh well its a factory fluke not the norm i love the lbz its the best one yet but cant make an omlet without braking a few eggs its back to gm r&d for this truck thanks for the ideas guys dont let this scare you away from the lbz it is THE only diesel i would own !!!!!!
happy motoring guys

Sorry you didn't get it figured out. It's an interesting problem. If you hear the result let us know.

Mine feels like I've got bumblebee's under my foot when it is on the brake (not moving ingear or in park). You can feel it in the steering wheel. A very fast vibration, more like a buzz. Pop the hood, put your hand on the motor same thing. You can't hear it, just feel it. Steady all the time, not intermittent. Doesn't matter hot or cold, any speed. Dealer says "nature of the beast. We started up anoputher '06 but it was the LLY, didn't feel as bad. Hope were not getting into a mess. Love it other than that. It's stock but it's a hotrod. Looking for an exhaust, doesn't sound like were gonna get much volume until we can bag the cat. Thinking MBRP catback until I get brave.
--------------------------
06' LTZ
Victory Red 2500 crew
Back Country steps
Line X
BFG's 265/75-16
My other diesel is a Farmall 560 w/ M&W Turbo. It's stiil on Yesterday'sTractors.com I think.
Looking for an exhaust, doesn't sound like were gonna get much volume until we can bag the cat.

I have noticed a very simular vibration as Josh has. Thought it was normal.

I've noticed the same 'buzzing' feeling lately with my foot on the brake pedal that Hitman mentioned. May be just the "diesel beast" but didn't notice it a few weeks ago.

Yep mine vibrates at idle when sitting at a light. Its a Diesel truck, what do you expect? :confused:

not the samevibe if you dont know what the concern is or havent read the entire thread dont bother responding.

Yep mine vibrates at idle when sitting at a light. Its a Diesel truck, what do you expect? :confused:
I agree, everybody is beginning to think they are feeling different things. I say if it aint broke dont fix it.

so just a note for you guys that say vibes are normal i do this all day and i know whats "normal" and whats not. so with that in mind i should finish this with heard from gm the trans was at fault something internal to the main
shaft with no gear selected causing vibration they are supposed to contact me with further info after further r&d. new trans no vibe!!!!

I thought the vib was still there with the torque converter unbolted?

i know its not trans due to disconnected converter vibration still there.:confused:

ihave it to at idle ,and it makes a poping type noise as well that you can feel at idle , also when driving above 70mph there is a taping noise on the drivers side between the hood and wind shield what is that .
:help:06 lbz white 285/75/16 helo black max

".....the trans was at fault something internal to the main shaft with no gear selected causing vibration...."

Glad you figured out what the problem was, at least it's not the fault of the LBZ. :hail: :clap:

Maybe somebody @ Alison dropped his watch in there during assembly? :banghead:

Funny that you mention that. I have the same thing on my 06. When warm there is a noticable pulsing vibration in the drivers seat. It is still there when cold but barely noticable. I haven't taken it into the dealership cause I wasn't sure if it was normal or not. It doesn't rattle the mirrors but it is definately annoying. There are only 1000 miles on the truck. It goes away once I put it into drive. Mine was manufactured in Sep 05. Is this something I need to get checked out?

Riceman
2006 Silverado 2500 HD
Crew Cab, LBZ, LT3

I am guessing the vibe he was TS'ing was quite intense instead of a slight vibe that you wouldn't notice until you read about it and it makes you go hmmmm. I believe they are all going to have some kind of vibration going on.

I posted a thread earlier today before I even read this one boss...trying to figure out if this something for concern...thanks bud -:t not much help!

Did all of you read one of the posts in the beginning of this thread? He put a LLY program in the LBZ ecm, that means the LBZ flash will work in the LLY trucks. Hmm I wish GM would let the techs do that for us 06 LLY owners. ):h

yes it is possible it can be done however it reaks havoc on all the other modules they all have to be reprogrammed and it has to be from a comprably equipped truck so everything works.gm even offers a reprogram for the medium duty trucks with the 6.6 lly to up the output to lbz standard so im in reno wanna experement and see if i can perfect the program come see me!:ro)
also i realize that i had the converter unbolted from the flywheel and it was still there
but when the engineer came out the last time he took another shot with the diag "shotgun"
and said to replace the trans. i replaced it and to my disbelief it was gone so i dunno but it is what it is...sorry i cant give you more info on it but dont worry your trucks are fine im sure i have not seen another one like it although i have felt the same vibe but alot less intense on trucks with alot of miles and working fine.