I have the same problem with my 1993 850. I am also having a problem with rough idle and periodic stalling at normal operating tempeture. I read the manual and it seems to be linked through oxygen sensor onthe manifold which reports back to the ECM (engine control module, which is the brain box ). A...

I have just purchased a 1993, 850, good engine and transmission. Non of the courtesy lights work, doors, rear ash tray, dome lights (front or rear). Several bulbs were blown. Got new bulbs. All fuses are good. Any suggestions?