I am have a Hard to chase down problem with my 93 E350 351 Van Getting a check engine light with a very rich running. Lots of codes each one is a Sensor Low voltage.

I have pulled and cleaned the connections under the dash and put in a new ignition switch. But have not found the reason for this problem yet. Anyone Have something like this before? did a lot of searching but not good threads on this that I found.

 

So I replaced the computer on friday and it seems to have cleared the problems. Have only put about 30 miles on it so far.