Ford Focus Forum, Ford Focus ST Forum - View Single Post - rust on the spark plugs
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Old 01-20-2013, 11:18 PM   #10
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The factory plug tunnel cover part of the wires does not totally seal water out, only the bulk of it, I've seen some wires with small notch for venting I guess, that small hole leaks water in even if wire fitted properly. Washing motor would do it.
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