I'm hoping someone on the forum here might be interested in helping analyze transmission logs / provide feedback
I'm not sure about what I should be logging - any help here would be great. If there are some guides please link them, I like details, feel free to explain things in detail.
I posted this question over on the VCM Scanner forum a week ago, but got no replies.
Back story:
I have a 2013 Impala with the LFX engine and 6T70 transmission. Bought the car a couple years ago with 42k miles, trans fluid was dark, had it flushed by a reputable transmission shop, and I can confirm they put the right fluid in - Dex VI (synthetic).
Issue 1) Under light acceleration from a stop, I can feel several short hesitations, best I can tell this occurs in 3rd gear. It feels like the transmission is preparing or starting to shift and then doesn't, 3, 4 or several attempts later it will complete the shift.
Issue 2) 3rd to 4th is sometimes a hard shift - often after issue 1 above has been occurring, and if I have accelerated moderately to hard then lifted off before 3rd to 4th shift - e.g. winding up to 35 to 45mph quickly to merge in traffic from a stop.
Both issues do not happen with moderate to heavy acceleration, everything is normal. But will also occur if I have gone from moderate to heavy acceleration, then lifted off the accelerator to light throttle or coasting.
If I disconnect the battery to clear anything learned, transmission performs nicely, with less "slop" in the shifts until the adaptives are set/learned again and the issues come back. Quite honestly I think the car performs and drives better before the adaptives are set - everything feels tight, responsive and on-point, which seems backwards to me.