The other part of mine that's not hooked up is the neutral switch indicator. That pigtail hangs lonely off the front of the tranny. To resolve that, all I need to do is run connections to pins 30 and 46 (working from recall this morning) and put them on a toggle say in the glove box. Whenever I want the ecu to know the tranny's in neutral, I'd just flip the toggle. That's more important as without it, the system won't allow a key on, engine running diagnostic/test routines to run.
Regarding return to idle, what I notice is that whenever I let off the gas, whether at speed (slip it into neutral) or rolling to a stop, it drops quickly down to around 1200-1300 rpm, and then takes a few seconds to ease on down to 850 rpm where I have the idle set by chip. Perhaps the VSS input lengthens that idle down period - but it seems about right to me.
I know on my wife's Bimmer, it idles around 650 rpm. However, while rolling at any speed above about 2 mph, it won't drop all the way down to that if you slip it into neutral. It only drops down to about 900 rpm. Dropping completely back to idle only occurs when you come to a complete stop - so I know it's paying attention to it's VSS. Also, it could be that I'm missing out on some fuel efficiency possibilities here - the combination of neutral switch and VSS functioning could allow the ecu to completely cut fuel under certain deceleration modes -- assuming the ecu is programmed to do that. Seems I've heard from others it will - now I've got to drag Probst out and see if he addresses that. I've got to get under it this winter anyhow to re-route positive battery cable in preparation for having a true dual exhaust fabricated. I could tackle this while I'm under there I suppose...
