Help with the truck that no one can tune

[duratothemax]

Ben,

Your age is really showing in your posts..........calm down, I just want a fix not not a band-aid.

Why would you want to not "find" or "fix" the problem ???? I do not believe that building a fooler in the long run is the right answer to the problem as it will pop up on other builds and other OS's.

Although I am sure everyone would appreciate another BT Gizmo the problem will still exist and I would rather the problem be fixed then covered up.

Maybe Brayden is right, maybe it's a sensor, maybe Kory is right, maybe it's a voltage anomoly, maybe I am right and something in the code is still waiting to be discovered........what I do not want moving forward is tuners telling EFI-Live they are NOT having troubles when they truly are and because they won't swallow their pride and bruise their ego to come out and say "WE HAVE A PROBLEM" things like this are not taken as seriously as they need to be until the owner of the truck throws his hands up and say WTF !!!! My truck won't run and nobody knows why !!!

Telling Ross that all is fine, never had a problem, first I have heard is doing a dis-service to EFI-Live and the community. I know we have a problem, I just don't know at this time if its a sensor, but what I do know is up until now with what we have for tables to adjust/set-up and DTC lists if you tell a code not to set it usually does not, with exception of a few of these LMM's



I have almost 30 hours in this with the builder, I don't care about being paid for my time, I just wanted and hoped to find the problem, but as Ross stated, we eliminated all DTC Codes and it would still throw a reduced engine power message at certain conditions. Without a code to go by Ross was throwing darts at a dartboard in the dark !!!!

I know its boost related because when it makes little or no boost it throws zero codes, when you try to manipulate the VVT to bring boost in quicker it codes, Rob failed and I failed in getting it to do what we wanted it to do.

So if everyone else wants to try it I will email you or post up Matt's stock tune so everyone can play around with it.

Im sorry tony...I just took that the wrong way I think. :hug:

I think what this really boils down to, is that secretly you dont want me to pursue developing a fooler widget....because if I work on it, and figure out how to fool it so it wont hit REP, then EFILive wont bother fixing it...and you really really want efilive to fix it the "right" way......amiright? :

 

[GMC_2002_Dmax]

Im sorry tony...I just took that the wrong way I think. :hug:

I think what this really boils down to, is that secretly you dont want me to pursue developing a fooler widget....because if I work on it, and figure out how to fool it so it wont hit REP, then EFILive wont bother fixing it...and you really really want efilive to fix it the "right" way......amiright? :

Yes

 

[duratothemax]

And guys.

this isnt the first generation of duramax's we've seen an issue like this...........where no codes set, but fueling is messed with and the ECM is in some sort of hidden background limp mode..........

apparently no one remembers the LLY's. But I know I know, that was just me, and im crazy and/or dont know how to tune....LLY's dont have issues.

I remember way back when, I could do two 1/4 mile runs back to back. The first run would suck, the truck would literally have no power until about 50 feet after I let off the brake, then it would all of a sudden kick in. And other weird issues where it simply wouldnt build boost when I power braked it. Fueling was being severely limited. I would come back around and get in line again...ran another pass....did the same thing....then on third pass....right before I pulled up to the line, I commanded the Tech 2 to "clear DTC's" anyway. Even though there were no codes, I still tried clearing the codes anyway. BOOM! Truck powerbrakes right up to 15psi, launches like a bat out of hell, and has a good run all the way down the track.

I found that it was semi-related to the MAF sensor. When MAF codes are set on an LLY, it messes around with fueling. If you set the MAF codes to "not report", they wont set a check engine light, they wont set a code.......but the ECM still seems to run diagnostics on that P0101/P0103 anyway........and put the engine in some sort of hidden defueled state if it fails the P0101/P0103 diagnostics. It wasnt until I re-enabled the P0101/P0103 codes in the tune, and fixed the MAF table properly, that I stopped having the issue.

Has anyone tried clearing codes WITH A TECH 2 after the LMM starts acting up? Even though there are no codes....just try clearing DTC's anyways and see what happens.

Remember we dont have the "expected airflow" tables for the LMM's..................maybe we're all looking in the wrong place and maybe the REP issues are only partially related to boost.

I dunno.

ben

 

[duratothemax]

Everyone please read through this and draw your own conclusions.......................................



I think its all MAF related.

 

[porterhouse]

Guys im having the same problem with my lmm w 4094. Rob has sent me a few different tunes an im still having an issue. I hope we get this issue resolved.

 

[BLKLMM]

What OS is having issues to stay away from...I am shopping for another truck

 

[blackdirtymax]

What OS is having issues to stay away from...I am shopping for another truck

I don't think it's so much as the OS has the problem , its some of the segments that are different in the same OS . My problem child is a 8594 OS , but hey there are some Lmm's with the same OS that arent having these issues. If that makes any sense lol

 

[bluessmax]

I have 2 of the same 8594 OS...one does magic tricks...the other doesn't

 

[MACKIN]

WOW is there some poop in this thread! Just remember what is written on the INTERNET is there for~ever!!!!! :joker:

 

[JustinD]

Isn't 8594 GM's latest OS for the LMM? 08 LMM 3500 DRW went to the dealer for a update and it came back with 8594, had 7083??

 

[S Phinney]

And guys.

this isnt the first generation of duramax's we've seen an issue like this...........where no codes set, but fueling is messed with and the ECM is in some sort of hidden background limp mode..........

apparently no one remembers the LLY's. But I know I know, that was just me, and im crazy and/or dont know how to tune....LLY's dont have issues.

I remember way back when, I could do two 1/4 mile runs back to back. The first run would suck, the truck would literally have no power until about 50 feet after I let off the brake, then it would all of a sudden kick in. And other weird issues where it simply wouldnt build boost when I power braked it. Fueling was being severely limited. I would come back around and get in line again...ran another pass....did the same thing....then on third pass....right before I pulled up to the line, I commanded the Tech 2 to "clear DTC's" anyway. Even though there were no codes, I still tried clearing the codes anyway. BOOM! Truck powerbrakes right up to 15psi, launches like a bat out of hell, and has a good run all the way down the track.

I found that it was semi-related to the MAF sensor. When MAF codes are set on an LLY, it messes around with fueling. If you set the MAF codes to "not report", they wont set a check engine light, they wont set a code.......but the ECM still seems to run diagnostics on that P0101/P0103 anyway........and put the engine in some sort of hidden defueled state if it fails the P0101/P0103 diagnostics. It wasnt until I re-enabled the P0101/P0103 codes in the tune, and fixed the MAF table properly, that I stopped having the issue.

Has anyone tried clearing codes WITH A TECH 2 after the LMM starts acting up? Even though there are no codes....just try clearing DTC's anyways and see what happens.

Remember we dont have the "expected airflow" tables for the LMM's..................maybe we're all looking in the wrong place and maybe the REP issues are only partially related to boost.

I dunno.

ben

Ben I think it probably is along those lines somewhere. Without seeing all the info and being around the truck it would be impossible to know. I have only tuned one lmm and it doesn't have any problems. It had a cheater turbo as well.

Sent from my DROID RAZR using Tapatalk 2

 

[x MadMAX DIESEL]

I always clear dtcs before pulling or racing anyways I've made that a habit long ago.

Sent from my PC36100 using Tapatalk 2

 

[770JOHNNYW]

Guys im having the same problem with my lmm w 4094. Rob has sent me a few different tunes an im still having an issue. I hope we get this issue resolved.

Good luck hopefully we'll get her sorted

 

[MMLMM]

This is a LMM issue. Seen it a few times now on LMMs after twins or a larger turbo. I have not figured out how to tell which LMMs have this issue, but some do, and some dont.

Ill take a shot at it and see if it is doing what I suspect (as it has the exact same syntoms I have seen on a few rare other LMMs with twins).

I wont say much at this point, mainly cause I dont want to put my foot into my mouth, but if it is doing what I think Ill post results.

When I first heard of this by word of mouth my first thought was turn the MAF sensor around :rofl:


Oh, and the boost code, My LMM had this code all the time and I would get reduced power no matter what I did when I went to the 4094 and cheetah turbo. Ill dig into my notes and old tune and see what I ended up doing for that but I do remember being able to fix it in the tune.

 

[GMC_2002_Dmax]

What OS is having issues to stay away from...I am shopping for another truck

LMM's..........go buy an LBZ......better tuning is available

:thumb:

 

[GMC_2002_Dmax]

This is a LMM issue. Seen it a few times now on LMMs after twins or a larger turbo. I have not figured out how to tell which LMMs have this issue, but some do, and some dont.

Ill take a shot at it and see if it is doing what I suspect (as it has the exact same syntoms I have seen on a few rare other LMMs with twins).

I wont say much at this point, mainly cause I dont want to put my foot into my mouth, but if it is doing what I think Ill post results.

When I first heard of this by word of mouth my first thought was turn the MAF sensor around :rofl:


Oh, and the boost code, My LMM had this code all the time and I would get reduced power no matter what I did when I went to the 4094 and cheetah turbo. Ill dig into my notes and old tune and see what I ended up doing for that but I do remember being able to fix it in the tune.

Anything that can shed some light on this would help, especially if it is OS specific.

I only wish more people had come forward with the problems sooner, its frustrating that it is hit or miss.......I have set up alot of trucks and these few have had me pulling my hair out looking for the answers.



I had wondered if it has something to do with a vane relearn or possibly sensor rescaling, but I never sat in the truck to really get a feel of what it was like.

 

[IdahoRob]

I just returned from vacation today and was notified about this thread.

Here is what I know of this situation;

I was contacted by the person who put the truck together for tuning. I supplied tuing for the truck which ran well but coded. I then changed it to remove the codes and sent it to the builder. He emailed and said the tuning is good, no codes.

Then the morning I'm leaving for vacation, we get a call from the OP swearing and being very rude to Dustin. We didn't even know who he was as we had never heard from him or delt with him. After I called him back and listened to his "F" bombs and ranting about the builder and the tuning, I told him, if he wanted to discuss things in a polite mannor, I'd be happy to try to help. I was walking out the door and would attempt to help him upon my return.

After reading this thread, I don't know that I want to help the way this person acts. I have seen so many mechanical things cause heavy smoke/lag. I won't even attempt to list the things I have seen. Is this a mechanical issue, I don't know, but I do know that LMM and larger VVT's do not work well together.

Tony is right the LMM and 4094/cheetah's are a big head ache as if the boost tables are changed to make the truck work the way it should, then it codes. I have not found a fix on this problem.

 

[whitelmmmax]

I've heard that it runs fine now.

 

[mplv]

I just returned from vacation today and was notified about this thread.

Here is what I know of this situation;

I was contacted by the person who put the truck together for tuning. I supplied tuing for the truck which ran well but coded. I then changed it to remove the codes and sent it to the builder. He emailed and said the tuning is good, no codes.

Then the morning I'm leaving for vacation, we get a call from the OP swearing and being very rude to Dustin. We didn't even know who he was as we had never heard from him or delt with him. After I called him back and listened to his "F" bombs and ranting about the builder and the tuning, I told him, if he wanted to discuss things in a polite mannor, I'd be happy to try to help. I was walking out the door and would attempt to help him upon my return.

After reading this thread, I don't know that I want to help the way this person acts. I have seen so many mechanical things cause heavy smoke/lag. I won't even attempt to list the things I have seen. Is this a mechanical issue, I don't know, but I do know that LMM and larger VVT's do not work well together.

Tony is right the LMM and 4094/cheetah's are a big head ache as if the boost tables are changed to make the truck work the way it should, then it codes. I have not found a fix on this problem.

No F bombs were dropped in any discussion until I was told no one would talk to me because I was not their customer, which was odd because I answered the phone and paid for the tuning when I got the call. At that point I was a great customer because my money was gladly taken.

If the truck is running right it's news to me. It's out of sight/out of mind for the most part.

 

[IdahoRob]

To clear up a few things;
1. The first I heard of you was when you called last Monday, I returned that call within 5 minutes.
2. Jeremy was the builder and called with the order and paid using a CC in his name.
3. This is the last email I received from him so I didn't know there was an issue until your call and we had no record of who you were. So far so good with the latest tune smoke gets better I tried to lug it into reduced power but she didn't bitch! I'll let u know when I drive it more
Sent from my Verizon Wireless 4G LTE DROID
I'll refund the card I have on file, and be done with it. Jeremy sent me photos of the build, you have a very nice set-up and hopefully someone will get it running to it's potential.
Good luck.