Strange rich running problem

[DSM8ALL]

OK, this issue has me stumped. It's long, so be patient. First off, 93 AWD, 20g , 2g MAF, adj FPR, SMIM, 680cc injectors, stock ecu with S-AFC1. I have been driving this setup for a long time with no issues. Recently I was at the car wash and had washed my car, dried it, and went to take off. The car was running terrible. I checked the basics, I/C piping, AFC settings, etc, all good. It's running rich and just dumping fuel.
I get it home and start checking things, this is where I'm at;
I have replaced with known good working parts-
3 different ECUs
3 Different SAFCs
FPR
coil
power transistor
wires
plugs
injectors
injector resistor box
MAF
There are no codes in the computer, I can watch data and see air flow etc. When I use the AFC, I can add 50 or subtract 50 in the low throttle and it doesn't change anything. The car runs the exact same with the AFC plugged in or removed. I have air flow signal into the AFC and out.
At this point I have a stock ecu and stock 450's in the car and it runs great. But the AFC doesn't make any changes at all.

I am not a newbie regardless of my status, I have been working on DSMs for 8 years and have never ran into this issue. My guess is there is an issue with a ground or power in the engine harness, but I didn't want to swap a harness if there was some knowledge on what the exact cause or fix was.
Any knowledgeable help would be appreciated.

 

[92AWDHX40]

Seems like something got wet, could be anything as to the cause. I learned to be careful washing my car. Could be anything check the ecu pull it out and look at it.

 

[34tftf]

do you possibly have the wrong wires connected from the AFC to the ECU?

 

[DSM8ALL]

As stated before, I've swapped the ECU out with 3 other known good ones, as well as the AFC with 3 known good ones.
I had been running this setup for over a year as it was and the AFC worked great.
I understand about getting things wet, but it has also been sitting for 4 months or more and should be dry.
I have a customer with the same problem on a 2g, and I'd like to have a good place to start when the car shows up so I'm trying to trace it down in my car first.

 

[92AWDHX40]

Four months once something is damaged its damanged could be anything that got soaked,sensor, coil pack etc. Been there coil was fried.

 

[DSM8ALL]

In the original post I listed everything that I have replaced/swapped with known good parts. Water may be a cause, but it's not a common component issue. I am looking for specific help from someone that has had this particular issue, not just random guesses.
As I said, I believe it is in the wiring, but I'd rather find the issue in the harness and correct it than just throw another part at it.

 

[92AWDHX40]

Well look at your wiring some of us may not have had a similar issue like yours. could be a short, since you mentioned wiring, it could be simple as that a short. Fixing electrical problems is a pita but you may have to find it.