S14 Engine Problems HELP!!

[Arnie]

I'd also suggest to recheck the splices to the ecu as per John Bennett's conversion manual. If the wire colours don't match (which might be the case as you are using different ecu) it will give you trouble as it did on mine when I had a hybrid s14/s14a ecu (late s14). Also NVCS (Nissan's vvt) might be an issue here as it's not activated as it should but not sure on that.

You don't have to change engine temp sensor for the conversion. You only have to swap the CA sensor for the gauge on the dash which is located below the air inlet to the plenum (think you're right that it's the one with brown plug - single wire), next to engine temp sensor one - yellow iirc.

The strange thing is that the rev counter isn't working for you because it should (clocks are ok they worked with CA). This, and the fact why the fuel pump is not starting itself (you have it on manual switch) suggest me that the ECU connections either at the ecu or the wires going to it aren't great. Check all with multimeter as per manual. Also, You need to swap the speed sensor from CA box to make speedo work properly.

AFM would be my first suspect, ignition timing second, borrow a proper ECU with loom if possible - it really can give a lot of headache.
Open exhaust shouldn't cause problems.

I have a PDF of s14 workshop manual, can send it to you if needed. There's loads of troubleshooting procedures there to check out.

[s13-ste]

if you unplugged the AFM and nothing changed then id be looking at that, maybe there is a break in a wire somewhere you cant see??