sorry cant help with the wiring ,but im currently on the way to building mine just a few things you should look at to do .
change the fuel line under the car to a larger diamatre for better fuel flow also a front brake up grade does help alot kev rowley does a silvia brake upgrade for the front ..
when you cover the old hole for the shifter make sure your metal has a 40mm overlap this is required if you going to get it engineered .if you need anything just pm me theres a few diffs out there too that work well under the 120y too ,cheers geoff

It has 2 fuel pumps and a surge tank, one pump is a carter and the other im not sure. But they both turn on. Yeah this setup worked in the other 120y, but somewhere between getting it out and back in I've missed something. Its hot now, but later I'll try a differnt spark and lead. I'd like to know where the main power input is for the ecu, I look at the loom and it doesnt mean much to me :~. Thanks for the help tho

Sounds like you are losing power to the ECU causing it to "reboot" when going from "start" to "ign".

weak spark problems can be difficult.

I don't think the old test of taking the lead out and trying to get a visible spark is a very good test, making the spark jump in the open air and under cylinder pressure are quite different, i've had things happen that caused there to be a spark present, but not one that could ignite fuel, basically the spark blows out as the cylinder pressure rises.

did it all work in the other 120y ?

wat fule pump are you useing ?

try another lead and another plug .

coil packs normaly dont all go at wonce so if you got good spark out of another lead i would say replace coil packs

Hmmm, I had a play around and have power to the fuel pump, dash lights (as in the charge light), turbo timer(that little timer thing with the button on the dash) and the starter motor. I think the coils have power as the car will crank, then try to start but as soon as you stop the key turn it dies which I think is a lack of fuel , which would probaly mean the ecu. I had one spark lead out with a plug in it and got a small shock when I cranked altough I couldnt see a spark.

i would get a lecky out to have a look but
have you got power to all the following your starter motor? test light
fuel pump ? should hear it hummmm
power to the ecu ? ( a red or green light comes on if you do

Yeah I tried a search, not much help there. The original loom I have transplanted and my electrican brother helped me, but the previous owner had begun to add in things like central locking and an alarm and looks like he couldnt be bothered and just stuffed a big ball of wires under the dash...!

Have you tried a search?!?
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why didnt you swap the loom over from the converted 120y?

or was that in need of re-doing aswell?

sorry cant help with the wiring of it...