Looks like the IAC is wired up correctly. I was able to move it back and forth with the TunerStudio test controls. I think the problem was that I didn’t have the IAC’s initial position correct before I installed it. Once I ran the test such that the motor retracts as far as possible in the Run position, and then out to the point that it correctly seals the intake in the Home position, everything worked much better.
The AFR is now a much more reasonable 15-16 with no adjustments. By adding fuel I was able to get it into the 14.3-14.9. I kept tinkering while it warmed up (so, the VE table is a bit of a mess now). At 185 degrees or so I adjust the throttle set screw, which I finally found under the arm. Annoyingly, you have to open the throttles all the way to get it adjust it, so I had to turn off the car and each test. The idle is seeking a little in the mid-700s to mid-800s for now.
Obviously I attribute all success to hugging the car.
I have a coolant leak I need to fix before I go further; I’m going to do that tomorrow. I think the leak is at one of the pipes near the firewall under the intake manifold (one of those two big pipes), so I’m hoping I can figure out how to replace the hose clamp without needing to drain the coolant system first.
I don’t think I’ve fixed my sensor noise issue, unfortunately. The log still shows the TPS creeping up, and the CLT and MAT are still a bit noisy. While I set the idle at 185 degrees CLT as read from TunerStudio, the DMC temp gauge is only showing about 160, although I don’t know if the DMC gauge is just not very accurate or what. CLT when cold is about right at 79 degrees, roughly the same as theambient air temp.
On another note, oil pressure is good. Not sure why the RPM meter isn’t working, but I can worry about that later.
Also, the engine appears to be backfiring — at least I think that sound is backfiring. It’s an occasional pop from the exhaust. Happens every few minutes, sometimes a few seconds apart. I’m not sure what to do about that. I’ll post a video of one of the pops when I’m at a computer again.
Thanks!
— Joe