You don’t have Motronic, you have ME7. Engine management of champions

I found the last lost wire, loom branch, it had been lost in the jungle. plugged it in. Started perfectly instantly as though it was all warmed up and never had any problem. Thank you all so very much. Finally, the last piece of the puzzle ! Congratulations; miles of motoring pleasure on the horizon.

Wow! Well done and glad you got there in the end! There would have been a pollution warning for all the blue word smoke coming out of my garage if this had been me!

Neil.

You are welcome and that is what MVS is all about. Helping where we can and just as important encouraging when we can't!

Neil

It’s a 4 speed. Aw55-xx denotes a five speed. Look at the plate in the transmission to confirm. Don’t rely on paperwork and internet for point info like this If you used an aftermarket pnp, they suck Try this test. Drive the car with and without the W button depressed. It should be noticeably differ...

What was the code which your "volvo guy" cleared?
Don't drive it like this... you will fry plates in the transmission.

https://www.fixya.com/cars/t26999137-2000_volvo_s70_dtc_p1631 It's TCM request for ECU to turn on the CEL. Your car have CAN network and these 2 modules are not communicating to each other. Along with no start situation you had before because of broken wire somewhere in the loom....there might be ot...

The reason they did that was to ensure any oxide was cleaned off. If you were worried about that then don't do it. Just give then a good clean.

You would have to clear the codes of course.

Neil.