Has anyone had any luck understanding and figuring out any of my uploaded tunes? I keep checking in every couple of days, and I see that it's been downloaded 7 and 8 times. Should I wait and see if anyone can do anything with those or should I go ahead and buy the Diablew tune?

I see that my old tunes were downloaded. Has there been any progress made on them? Just checking in...

Thanks,
Wayne

Wierd...my post didn't register when the new site converted... here is a repost of my last post a few days ago.

Well I figured I'd give this another go. I had lost the cables to my tuner for a while, but I just found them and figured I'd post up my backup and last tune written per Mike's request ...

Sounds similar to my problem I've been having for over a year now with my '04 Suburban 2500 with the 8.1. With the 87 tune installed, when first started, it would idle smooth for 5 seconds, then idle rough for 4-5 seconds, then smooth, then rough, etc. And when I tried to rev it up, it would get ...

Well I figured I'd give this another go. I had lost the cables to my tuner for a while, but I just found them and figured I'd post up my backup and last tune written per Mike's request. The Sub has been running so good and smooth, I had almost forgotten that I still needed to get the Diablo tune ...

Hey guys. Sorry I've been away for a while. After my last post, I tried changing some of the parameters for the shifting... it still acted up. Since then, I installed a Magnaflow cat-back. Then a week later, I installed a set of Edelbrock headers (coated). Man does it sound different ...

Ok, I think I might have it straightened out. I couldn't get the revised tune that Lew did for me uploaded to my tool for some reason. It showed error 04000x. It uploaded 80-85% then the error came up. I think I didn't have the correct original backup tune matched to it, and I couldn't remember ...

Thanks Lew. I'll give that a try.

Yeah, everything is good to go on the Suburban. The only thing that I thought that it could be early on was an oil pressure sensor that went out before the initial tune. I replaced it a couple months ago and there wasn't any change.

I actually thought about ...

Thanks for the quick response Mike. I added the last tune written that I just got off of the tool.

I finally got a log of it acting up, but I only had my tuner with me and no laptop, but I logged a short complete GM data-log, and saw some of the stuff it was doing. When it went into limp mode, this time in 3rd gear, I gave it some more throttle to accelerate, the timing went down to -5 degrees ...

Any updates?

smokestack wrote:I would imagine if the smart guys here could not solve your tune issues. Its tranny related.

It seems like all the 8.1 guys are getting this issue.

BTW, I have an 8.1 and a 4L80E....not an Allison.

Yeah, mine still does it once in a while. I have Mike looking into it for me. I'm going to run a datalog next time I drive it, hoping to catch whatever is making it do that on the log.

Okay. Next time I go out, I'll take the laptop with me and start logging. Thanks Mike.

Nothing comes up on the dash and nothing showed up on the Predator when I checked for DTC's. Yesterday it did it when I pulled out on a main road and started to get on the throttle, then it's like a light switch and comes back when it shifts to 2nd gear. Other times it's reversed, fine in 1st gear ...