Ok, one step closer.
IAC issue hopefully resolved.
I never did get the bidirectional 86 unit to comply, but did wire the 87 in and adjusted all the software settings.
I used a free 12v pin on the LH harness side and pin 8 on the ec36 side as ground output to 87 IAC.
Then of course that didn’t work, and I pulled the ecu out and started bench testing with the IAC lock function in the VEMS software.
I could not get any frequency on the IAC signal pin in question. I had used a different pin then Peep but it was still in the injector grouping.
I really could not have done this without Chris(Shifted), who had heard that pin six was the only one in that group that had the diode set up to signal the IAC. He also answered about 500 texts. Not published anywhere I could find, but he was right. Went back to pin six and frequency matched whatever Hz I picked on VEMS.
Then using a boroscope with video feed next to my laptop, I stated trying to calibrate the IAC, gate movement to duty cycle. Pretty tedious plugging in numbers at each frequency.
The best curve was actually at 45Hz for some reason. I was going into this thinking 100Hz.
Matching gate opening to DC via the IAC lock function Min DC 39 and Max is 90 DC. This is close but not the same as the 27 and 80 dc that I had researched.
So there is a curve, but it’s not linear which I’m not crazy about. 50% open is 80DC.
Anyway, hopefully it’s enough to keep the rpm’s from falling off a cliff.