Hi All.
I swapped a LY6 and 4L80e into a 1976 Winnebago (I saw Turbo LS Swap on youtube and couldn't resist - just all stock still though).
Anyway, engine and trans combo were purchased together (but were not from the same vehicle; eng from Yukon, trans from ??). It cam with standalone eng harness and computer (e38-12614088), and matched trans harness and tcm (t42-24235341). The harness had no knock sensors or O2 sensors, and VVT was tuned out (I believe for a hotrod) - I added the wiring for the knock sensors, primary O2 sensors, and VVT since I was hoping to be more stock (the Winnebago is no hotrod - yet). The engine starts and runs well sitting and revving (although a little looping at idle but strong on the throttle - the MAF sensor is not calibrated I think), but when rolling it goes slow then coughs and stalls abruptly, but if I quickly shift to neutral before it stalls it stays running. 2007-Avalanche - Schwanke (May-9-2021).hpt may-12-2021 - log1.hpl
I have been scouring local junkyard for an LY6/MT1 e38/t42 combo (2008 Savana/Express). I found one but they would not give me the t42 without me also buying the transmission. I took the LY6 e38-12617631. I also tracked down another can (also 2008 Savana/Express) with an 6.6L diesel and an MN8 (4l85e) - so I grabbed the t42-24239927. I connected them to the Winnebago wiring and pulled the tunes as a combo. 2008-express 3500 (junkyard - LY6-MN8) e38-t42.hpt
I also tripped over another van (also a 2008 Savana/Express) with an LY2/MT1 that had e38-12617631 and t42-24239927 as their combo (same OS's 0 I am not sure if that is a coincidence. I also connected them to the Winnebago wiring and pulled the tune. 2008-savana 3500 (junkyard - LY2-MT1) e38-t42.hpt
The Winnebago would not start with either the LY6 computer or the LY2 computer. VATS???
I plugged the MN8 computer in with the hotrod computer, but it wouldn't idle enough to idle in gear.
I was hoping to connect the LY6 computer I picked up with the MN8 computer and drive to a pro-tuner (or peraps the LY6 with the MT1 computer). But maybe using the LY2/MT1 computers together (since they are from the same van) is better then tuning it to run. Would the LY2 computer run the LY6?
Sorry for the long post, I have spent a hundred hours cruising the posts, and at least that many cruising the junk yards. I am hoping I am close.
Thought's?
Thanks
Roger