Can anyone give me a run-down of the symptoms of a failing CPS?

I've decided to sell my 240 and wouldn't you know that when someone is there to see it, it refuses to start. Quite embarrassing. At least in this case it was two Brickboard members who were not overly concerned about that issue, and had already decided not to buy the car anyway.

After running in the AM and PM, it began to snow heavily and while the car was under shelter it steadfastly refused to start for the rest of the night and the next day until it suddenly started to work again. It is much drier now, but still cold.

I tried to use the diagnostic block. The only thing I get is with the Pin is the #6 hole, the LED shines brightly. No flashes to decode.


The insulation on the CPS *is* failing, but there are no exposed metal wires that I could see. I've jiggled the CPS wiring, repositioned it, removed and reconnected it, and none of these thing made a difference in the starting or running condition. After it was running I played with the wire some more and could produce no change in the running condition. In the fall, I was able to make it stumble a little bit by pouring water down the firewall.

Is there anything else I could be missing? I've confirmed fuel pump function and fuel at the injector rail. I've not been able to confirm spark pulse yet, but now that the car is running again, I'm not sure it would tell me anything.

I can diagnose and solve a complete failure, but this intermittent, time/atmospheric-linked problem is very hard to figure out.
This is driving me nuts!