OK then here is a summary of what I tried today:
FAIL
A. Drove the car as normal - when engaging DRIVE the car lurches into gear and will stay in 1st gear until approx 4000RPM and then shift into second gear - car needs to be driven over (at least) 40MPH before it will up-shift into any higher gears.
B. Disconnected sensors 1 through 3 (individually) and car drove with the same characteristics as item A above - so no effect noticed.
C. Disconnected sensor 4 and when putting car into DRIVE no hard shift observed (definite difference). Car drove as if in some sort of "economy mode" with little or no feeling of power at all - suspect this is a mode where a single higher gear is selected? Car did not up-shift at higher speeds and appeared to be driving in a mono-gear...
Edit: Forgot to mention that with sensor 4 disconnected I can select 1st gear and drive off and then push the selector to 2nd and it will up-shift but continuing to DRIVE does not engage a higher gear - perhaps the car is stuck in 2nd gear when disconnecting sensor 4 after all?
So...
Disconnecting sensor number 4 seems to be the one that applies for the S14 but doesn't help my problem out so far.
One thing that I noticed, despite driving only relatively short distances, the car appeared to be pretty hot under the hood, even although the temperature gauge was in the normal position?
Any ideas based on any/all of the above?
Cheers in advance