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    2001 lb7 ECM Trouble ?

    I have managed to get somewhere with this. I had my mechanic friend who owns the autocal give me the original copy of my stock ecm file that he had saved years ago. If i load the program on my ecm from the memory stick the idle lope goes away. If I open the file with my copy of efi live and...
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    2001 lb7 ECM Trouble ?

    I'm going to try that. I think the hardest part will be finding one though... What about the ficm ? any suspicions that It could be responsible ? I'm not too clear on what it actually does other than create the higher voltage for the injectors and fire them.
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    2001 lb7 ECM Trouble ?

    Yeah I've tried the original. Same procedure as always with efi live, works every time without errors. That doesn't mean there aren't any i suppose.. A good friend with an expensive scanner checked everything he could and didn't find any problems, but did note that the injector pulse width was...
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    2001 lb7 ECM Trouble ?

    Not sure what to check next. I tried Daves nologic lb7 tune a few months ago just too see what it was like. I had to run a script since some differences exist between versions and etc. I followed the instructions posted and it worked fine. I got a few errors that pertained to missing maps, ones...
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    Duramax Tahoe. Tuning the allison 5 speed

    I actually got it narrowed down pretty good now. No lock up until fifth and about 90 kph at about 35mm3 IIRC, then once in I like it to hold until about 74 so I get a decent range between lock and unlock. A little different than what most people seem to like but It sure works nice for me. I set...
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    Duramax Tahoe. Tuning the allison 5 speed

    I don't have any shifting "issues" either. This is the problem, I'm having. I don't like the stock shifting, I wanted a custom tune that will work with the way "I" drive. Instead I'm told over and over there is something wrong with my truck and the tune I got should be fine. Sure it might be...
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    Duramax Tahoe. Tuning the allison 5 speed

    Attached are two data logs. The one named "stock" is as you would guess, 100% factory tuning ecm and tcm. Just a short drive down the highway and up a side road. The second tune called "test 3" is my current trans tune and my current ecm tune, same drive. There's nothing wrong with the truck as...
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    New Development, unwanted idle lope ...

    try again....
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    New Development, unwanted idle lope ...

    Datalogged it today. I cant see anything wrong with fuel pressure. It seems to be related to MBPW and MFUEL mm3, both show a saw tooth pattern that is pretty well synchronized from what I can tell. I hope I havn't hurt my computer or fuel module. I'll attach the log, i'm sure there's more there...
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    New Development, unwanted idle lope ...

    Okay I'll check out actual vs desired rail pressures. Cp3 is stock but fpr is new and so are the injectors. Trans tune is good now, this is the only outstanding issue.
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    New Development, unwanted idle lope ...

    So I've been swapping tunes in my 01 duramax and data logging the results. Mostly tcm tunes but I did try an ecm tune that I found here in the tune library, the No logic 3.0 lb7 tune. Tried it out but couldn't run it, made way too much noise. Sounds like a really cold diesel even though truck...
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    Duramax Tahoe. Tuning the allison 5 speed

    Alright I returned it too stock tuning for a couple days. Drives just the way I remember it. Not bad but too much like a big Flat deck one ton truck. The Tahoe is small and almost sporty.... this stock tune is not. So since I have the auto cal for a couple days I figured I would try to sort...
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    Duramax Tahoe. Tuning the allison 5 speed

    Okay, I'll put it back to stock and i'll try my old tune. It will take me a few days but I'll report back.
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    Duramax Tahoe. Tuning the allison 5 speed

    I owned and drove both the donor one ton and the tahoe for years before the conversion, both 2001. very familiar with stock tune. Ecm and tcm. There is no problem with the vehicle this is strictly tuning related. What defines a custom tune ? To me custom means custom to my vehicle and its...
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    Duramax Tahoe. Tuning the allison 5 speed

    Yeah there's more to it than you would think. The truck tune is way off, the shifts are spaced too far apart and let the rpm come up too fast. I easily get into that defuel mode when everything just stops and you have to wait for it to come back and then try again. The passing gear downshifts...
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    Duramax Tahoe. Tuning the allison 5 speed

    Any one out there with a duramax tahoe running a trans tune ? If so who did it for you and how was the experience ? I'm going through the proccess right now and I'm finding it hard to have confidence in the phrase "custom tune". Seems more like a generic truck tune than custom and requests for...
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    NP246/266 custom build

    A bit of feedback on how this mod has worked out for me, I have around 1500 k on the auto trac now and it works great! I have been watching the transfer case temps with a gauge that is installed inline with the external cooler and filter and it reads the hot flow into the cooler. Heres what I...
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    NP246/266 custom build

    Wow this is very cool I'm currently in the process of doing the same thing. It's been interesting reading this thread, I have a few questions though, if you don't mind. How many extra clutches and steels were you able to add ? I have only gone as far as adding one clutch and one steel by...
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