I did reset the auto-adaptive several times, and it would take the transmission back to a state where the changes were comparitively rough, but after a while the same pattern would emerge.Mandrake wrote:Yes the shift characteristics do vary on this car, sometimes quite good, other times they can be a bit abrupt and erratic, and whether it releases the lockup or not seems to vary.Under most circumstances the "auto-adaptive" adapts correctly to compensate for wear and (presumably) oil condition, but it may be possible that it adapts itself into a state where it misinterprets slippage and gets stuck with wrong parameters. In that case a reset would be a very good idea.
The Mk2 V6 that I had for a while had some difficulty with the auto-adaptive function, and the transmission parameters would vary significantly over the course of a few days, between having very soft changes, with noticable spin-up when taking off from rest, to having rather sharp harsh changes, so it certainly was continually adapting, it was just never happy with the result.
On your Mk2 did you ever reset the auto adaptives and if so did it make any permanent improvement ? Did you ever do an oil change ?
Could it be that the hydraulics on your Mk2 were intermittently malfunctioning due to sludge build up affecting the operation of the valves, and the auto adaptive was trying its best to compensate for the constantly changing behaviour of the hydraulics ?
The solution for both cars may be a change of oil (or 2 over a period of time) to clean it out followed by an auto adaptive reset a few weeks later after things have stabilised.
My theory at the time was that the symptoms may have been caused by low oil pressure in the transmission due to a blocked filter, but I sold the car before we got around to making a pressure gauge adapter. The car did have some 'transmission history', as it was a 1999 car with a 1997 transmission fitted, and it was filled with dextron when I bought it (but the symptoms above were still present after a couple of fills with the correct fluid.
I think you should pull the transmission fuse, and report how it drives. Take-off is a bit slow, but otherwise it should drive OK.