Xj12 ECU 16cu Advice Needed

[Doug_Dwyer (Doug Dwyer 1985 Series III V12)]

Recent similar discussion here:

Checking ECU Fuel Mixture

I read about the voltage check using a diagnostic port by the ECU to help with determining fuel mixture at each bank. I think I found the diagnostic port, but the wires don’t match. My guess is what I’ve been reading is Lucas related and different than Marelli. Before I start digging through the wiring diagrams which is a bit of a chore for me, being electrically impaired, figured I’d create a topic for some quick guidance, comments, etc. [image] ^^^ I think this is the diagnostic port to …

I have a feedback ECU (4118 as I recall) but no cats and no O2 sensors. The engine runs very nicely

Cheers
DD