I am thinking an interruption in power distribution. The fact that both the fuel pump and ignition are stumbling while the engine is still running suggests a common cause.
So a wiring issue in your opinion? I checked the engine bay fuses, would a failing relay be a potential culprit? COR was within resistance specs per BGB.I am thinking an interruption in power distribution. The fact that both the fuel pump and ignition are stumbling while the engine is still running suggests a common cause.
This suggests a global electrical distribution problem.... there was no CEL light with the ign still on...
... now I do not get a CEL when I turn to ACC with the key and while in ACC the IACV is clicking nonstop...
... is there any reason to suspect the fuel pump is dying?
Yes sorry, RUN, the position prior to engaging the starter. I ordered a set of thin needle multimeter leads so I can better measure voltage at the ECU pins. I find it strange that the IACV just clicks non-stop indicating some kind of wiring issue thats causing it to receive a signal(s) while the engine isn't running unless its normal behavior...thinking back it has always clicked a few times prior to starting and right after shutting the car off, but never continuously while the engine isn't running.This suggests a global electrical distribution problem.
You mean RUN, not ACC, right? ACC is accessory, and nothing is supposed to be running in accessory. If this is really happening as you say, then this is a real problem, so make sure that you are clear on this.
Don't clutch at straws. Your ignition switch may be malfunctioning, particularly if you are getting the wrong circuits energized as you suggested above. Another possibility is the main fusible link. This is a heavy duty fuse that is spliced into the main power feed and connects it to the battery positive. That can corrode and become intermittent.
I pulled the sheathing off of it and tested continuity from the ring terminal to the end of the silver wire and from the terminal to the thicker gauge copper wire then from the ring terminal to AM2 and all were good. Wiggled the wire around to see if I could get it to interrupt but seems solid. Harness was done by WireGap, only addition I made was a relay to ground the AC Idle/Up pin when switching the AC on (got the idea from an old post from AlastairMR2), but again it has always worked up until now so I don't necessarily see that addition causing an issue. Doug actually responded to my FB post on MR2OC suggesting its an ECU issue, I could see that possibly being a culprit since the only thing that would send a signal to the ISCV would be the ECU (or a short somewhere) since it was going nuts energizing the solenoid non-stop the other evening after shutting down.Check the main fusible link. If that is clearly solid, then work your way on to the circuit that powers the fuel pump and ECU. Did you make any connections for the swap? If so, check them first.
Maybe, if the ECU controls the fuel pump. In the mk1, the fuel pump is stand alone, but your car is probably different....suggesting its an ECU issue..
... the only thing that would send a signal to the ISCV would be the ECU ...