LB7 DSP5 Harsh Defuel Ghost

[xploitdiesel]

Ive been chasing my tail on this and I cant figure it out. 2002 LB7 running 15186006 OS. The truck defuels hard on every dsp tune except for the base tune. I even tried making all the tunes match the base tune, but tunes 2-5 still defuel like crazy! Does anyone have a good clean 15186006 I could try? Or maybe there's a known solution for this. Seems like a software issue.... has anyone ran into this?

[cindy@efilive]

I did a search on a couple of the forums and it appears that 15186006 is the 'preferred' OS of choice. There are no reported issues that I can find with that OS.

There is a 15186006 stock file in the Tune library here http://www.tunefiledepot.com/index.php?option=com_content&view=article&id=4&Itemid=3&Manufacturer=3&VehicleType=D&Stock=Y

Cheers
Cindy

[xploitdiesel]

I did a search on a couple of the forums and it appears that 15186006 is the 'preferred' OS of choice. There are no reported issues that I can find with that OS.

There is a 15186006 stock file in the Tune library here http://www.tunefiledepot.com/index.php?option=com_content&view=article&id=4&Itemid=3&Manufacturer=3&VehicleType=D&Stock=Y

Cheers
Cindy

Thanks Cindy, that's where I pulled the15186006 OS I'm having the issues with... I'm honestly at a loss...I tried removing all defuel and still it fall on its face through the gears...

[WisconsinHick1]

Did you build your tunes on your own? How does your rail pressure and PW look like in the upper RPM's? How about Boost pressure and Base Torque?

[xploitdiesel]

Did you build your tunes on your own? How does your rail pressure and PW look like in the upper RPM's? How about Boost pressure and Base Torque?

Yeah, these are mine. Its a bone stock truck. Ive tuned a few of them withthis same basic setup and non reacted like this except for one other that had the same OS and year. I don't think its my tuning. Especially when the base tune runs great but the other 4 do not and they all are identical(for testing purposes). Meaning they should all drive the same, have the same horsepower, etc... but they don't. Not at all.

[WisconsinHick1]

Huh something is most likely just a little country off causing it. I could take a look if you would like.

[xploitdiesel]

Ok...I just did a test using a fresh full flash of the factory OS 6006 from tunefiledepot. Just to make sure it's the right one I checked it in the TIS software for my tech 2 and it says that's the correct OS...So I then upgraded it to DSP5 OS & checked the segment ID#s. They all look the same still, so that's good. I then decided to not use my tuning and try a script that I bought from dmaxtuner a year and a half ago to see if maybe they had it figured out...this script has a couple HP levels that I could never use on this truck due to it being stock, so I drove it without them on...The tune worked great on my ole beater LB7 I used to have(back before I learned how to tune some stuff for myself), but I wouldn't put it on someone elses truck...way aggressive for a stock tranny if you ask me. It shifted just as funny and weird as it had before...so at least I don't think it's just me. Should I maybe start with an older OS and see if that fixes it? I could go with even newer than that but I know his AC won't work if I do...so that's not really a fix... I'm just chasing my tail...

[WisconsinHick1]

Have you logged it while driving?

[LReiff]

Did you reset the tap cells and do a fast relearn? Are you 1000% sure it's a defuel issue?

[DirtyMax03]

I know this is old, but make sure the "Base Torque" tables in the DSP tunes stayed in Ft*lbs and did not switch to Nm. I ran into the exact same thing with an LLY DSP5 tune and when I mapped it to DSP5 the units switched on the "Base Torque" tables in the DSP tunes only and made for a MASSIVE defuel.

[n2brk]

this is a little moldy, but I have to add a me too to share; you aren't alone. I've been chasing this for a week and finally gave up on 6006 and went back to the old OS... problem GONE. No matter what I did, the base tune would be wonderful and the tunes in folders 1,2,3, and 4 would defuel terribly. If I ran the tune as a single 6006 it was fine; put it in dsp5 and again nothing shifted well but the base tune.

The difference here though, is that I can't truly blame the OS! I re-wrote the tunes in the old OS converted to dsp5 (02444105) and every tune except tune 3 (dsp folder 2) was perfect. I copied all folders from dsp folder 1 into dsp folder 2 and it still had the bad de-fuel! WTF? So, I gave up. I went into tune 5 and added a little timing, reflashed and took the truck out -- all good. For the hell of it, I slipped it into dsp tune 3 and lo and behold the mystery defueling was gone. I am just totally puzzled!

I decided to just tell my buddy (I'm tuning his truck) to drive it this way for a while and see if 3 keeps working or gets screwy again. I'm tempted on one hand to tune that folder back to the level it was, but on the other hand I finally have 4 out of 5 tunes working and would hate to lose that, lol. I am at my whit's end with this "ghost".

[DirtyMax03]

n2brk,

Was your issue on an LB7 or a newer truck? Per my previous comment, make sure your Base Torque tables didn't switch to N-m units while the 'values' stayed in ft-lbs. I had this happen when switching to DSP5 on an LLY tune and really threw me for a loop for a bit until I realized what happened. Doesn't sound like this is the issue in your case though, as it wouldn't single out DSP2 only. It was all of the DSP tunes in my situation.

[n2brk]

'02 lb7. When it was all of the DSP's in the 6006 OS, I checked to ensure it was all in imperial, so I had that covered -- but when I read that I thought that it was a great tip! It only took me like 3 days to think of it on my own, hahahahahaha.

I am still blaming the truck though, only because of the mysterious appearance and disappearance of the defueling in just one dsp tune at the end there. It's so weird!

My buddy insisted on more power in tune 5, (stock trans) that I finally bumped him up to 2100us with the "it's not if but when" speech... so I am sure I'll see this ECM again when he gets the trans rebuilt and wants a max effort tune, hahahaha.

Wally
P.S. Perhaps note-worthy is a general communications error trouble code that popped up. I thought perhaps it was because he's been using a Banks on and off again just for the gauges, but maybe there's more to it?

[n2brk]

U1000 was the code, IIRC

[n2brk]

FWIW, I talked to my buddy this morning. The mystery defuel on tune 3 has returned. I opine that Elvis' ghost lives in his ECM... he says Tupac or Biggie; kids!