Where the coils fit down on the plugs they have holes for a locating screw,and the other one is brass or bronze.Is the brass one a ground?If so that might be my trouble all along.I removed coil cover and painted that area,and the brass screws got painted
Nice. Good job on finding the problem. I cant remember the last time working on the m104(it was about 2 years ago, i was going spark plugs on a r129 sl320) but i remember there was a ground point in between one coil and spark plug wire (i think it was between cylinder 3&4) i remember it giving me a headache because it was stripped.
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