Can you take a picture of it? I know the valve covers on the m119 have ground screws (one on each cover)
brass screw is it ground?
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
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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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