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Just swapped a 4l80e into a 2000 t56 camaro, segment swapped using HPtuners. I'm getting intermittent part-throttle early shifting. When it happens it will shift both 1-2 and 2-3 and lock the converter at the 0% TPS column of the shift/tcc table. Any ideas would be welcome, I changed the TPS even though it never actually dipped in the logs - no help. Tune/log/config and screenshots attached, only code is P0103 (speed density).
Still cant figure it out. Changed the 0% TPS column of the shift table a few times and the intermitent early shifting follows. Attaching another log/config/tune with more pids logged along with status bits.
Bumping this one back up. The bad shifts seem to correlate to a higher TCC slip. All the good shifts are at a lower TCC slip (3-500) and the early shifts are at a 600+ TCC slip. I've been playing with the P1870 stuff as a result with no success but its never set a code.
I attached the current tune, log and layout file (3.0 hptuners).
Are you talking about the TCC PWM%? It locks in both those screen shots (100%) after shifting to 3rd.
All this is in D3, I believe it does it in D4 too but I'd have to check some old logs as I usually drive in D3. It short shifts 2-3 also at the 0% 2-3 value of the shift table sometimes. It also locks the converter at the 0% TPS value of the TCC table sometimes.
man that's weird. do you want to have a look at my 4l80e tune you can do the compare file thing even if they arent the same OS. i have it running pretty sweet.
That would be great. I'd even eat the credits at this point and flash a known good file for lack of any other ideas. I'll pm you my email in case you dont want to post it.
No Prndl switch, Speartech t56 conversion harness. I think I'm going to start with an Auto file from a 2002 camaro with the 12212156 OS and start over.
I've been thinking about this for a while, I dont know why I was so stingy about HPT credits. The swap file was 2002 Silverado with a 6.0l / 4l80e. Grabbed it from the HPT tune repository.
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4L80E shifting too early 
