Hey, folks.

I finally got the fuel tank sender fixed and reinstalled in obnoxiously humid weather last night. Filled it with fuel (gauge still not working right, sigh).

About 2 minutes after I filled it, I got a CEL. Pulled codes and it's got:

Socket 2:
223: no signal from idle valve

132: voltage out of range

Socket 6:
143: no signal from knock sensor

Sounds to me like the wiring might be swapped between the IAC and Knock sensor. I remember that being impossible on the Bosch valves, but Regina only has 2 wires to the idle valve. The battery voltage could be from long cranking or something else, but I don't want to drive it with the two switched. I had to borrow a car and drive across town, so I can't put hands on it right now but I wanted to confirm that it's possible. I'm also posting this because search engine results didn't pull anything up but I swear I remember this being possible.

I know I replaced the IAC once before and I think the self-test worked but it's been some time. I hope this isn't a wiring issue.

Cheers!