Good evening all!
So I took a look at the O2 sensor harness and it looked like it was pinned properly for a 88-90, 5 spd. Just for safety sake, with the ECU plugged in, I checked the voltage on pin 46. To my surprise, when I turned on the key I got .04 volts. It jumped to .05v when I cranked the engine.
Knowing there wasn't much current on pin 46, I decided to pull out the A9L and put my A3M back in and test with it. It also had .04v at pin 46 with the key on. However, this time I heard the fuel pump charge without the signal wire and CEL wire twisted together at the EEC DLC.
So... I tried starting it and it fired right up. Though it seems to be running very rich (the idle is slightly lopey because of it). But at least there is headway... though I'm not sure why because I just tried this ECU last week and it wouldn't charge the fuel pump.
Question... the A3M is out of a '93. Would that be an issue running it in this 1990 car?
Thank you again everyone!