Arthur .... A scope would be nice. I tried testing the coil with my inductive timing light. I should have done this before but I kept putting the cover on before I reinstalled the air duct and then it was too late.

The results were not what I was expecting. With the pickup over the plug wire from the coils, the "bad" coil flashed but appeared to flash at about half the rate of the other coils and not consistent. I had expected that the bad coil would not flash at all. I can't imagine why a "bad" coil would flash at a different rate; either it should flash or not. I thought that the high voltage plug wires would come from the same point within the coil. Could the computer be not firing the coil because of something else?

Anyway, I'll get a new coil tomorrow and hope that an "Eureka moment" occurs in the driveway.

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Jim Villers
190SL, 230SL 5-speed, 95 E320 Wagon, 01 E320 Wagon, MGB, Boxster 'S', 190SL "Barn Find"