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Last edited by LRT; 05-24-2021 at 11:41 PM.
Thanks for the replies. It occurred to me today at work that I may have jumped the gun posting this thread. I'll post a follow up when I know for sure but I think deleting the VATS may have been unnecessary for now anyway. I think it starts and dies because of a failed crank sensor possibly. As I said I'll update when I know for sure. It will probably be a while before I have a chance to verify though.
And to further show my ignorance I removed the VATS and flashed the wrong .bin originally too. I flashed a Tahoe MPV with flex fuel OS. I re flashed it with the GMC truck OS (without flex fuel) and VATS removed and it starts and dies just like before. That's what led me to realize I probably jumped the gun on VATS. The engine is still in the stock truck with all the stock security intact after all...
I have a original 2004 Avalanche LM7 Z66 .bin in 7603 if you need it.
Oddly enough, the file shows VATS enabled, but the truck does not have the VATS module and does not use a chip key. Never really thought about it being enabled without the VATS system in place. This file is the original unmolested file.
Jack of all trades, absolutely master of none! Too many projects, not enough time and limited funds.
Geronimo, Guadalupe County, Texas
1993 K1500 Suburban - SBC Refit retraining the TBI and Computer Control.
2004 Z66 Avalanche 5;3 to 6.0 LQ9 upgrade - project pending
Thanks. And to anyone that wants the stock 2003 Avalanche .bin in 9405 here it is.
Time for another update. Unfortunately it makes me look ignorant but I wanted to post it up in case it helps someone else down the road.
My initial problem was that the engine would start then stall out after about a second. Instead of troubleshooting why, I immediately decided to delete VATS. That in and of itself isn't a bad thing. It will need to be eliminated eventually anyway when this engine gets transplanted. But after VATS was deleted it was still doing the same thing. That's when I decided I needed to troubleshoot.
It turns out it didn't take me long to figure out why the engine stalled out. If I'd have looked a bit closer when I purchased the truck I'd have seen it was missing the MAF sensor. I had a spare here so I put it in today and the engine started right up and stayed running. It isn't running "great" but it doesn't stall out. I will probably be flashing the original OS onto the PCM to see if it runs better before I spend much time doing any troubleshooting. If it does the same thing once the original .bin is flashed back I'll dig into it but that will be another thread if I need more help.
Thanks to everyone who took the time to respond to this thread.
Jack of all trades, absolutely master of none! Too many projects, not enough time and limited funds.
Geronimo, Guadalupe County, Texas
1993 K1500 Suburban - SBC Refit retraining the TBI and Computer Control.
2004 Z66 Avalanche 5;3 to 6.0 LQ9 upgrade - project pending
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