I put the bb in the line, cleared the codes and reset the computer. My wife said we needed milk so I took it about 5 miles to the store and back. no codes just yet, but I realized that my '93 300E (M104) EA goes through some sort of POST test (you can hear it cycle) if you leave put the car in diagnostic mode (turn the key to run without starting) but the '94 E320 doesn't do this. I'm beginning to think that the EA is the culprit. I will definitely pull it and verify the wiring in more detail.