If you are the owner of a Ford truck with a three-valve (3V) modular V-8 or V-10 engine built from 2004 thru 2007, you have either faced the misery of broken spark plugs - or you will. The Ford 4.6L, 5.4L or 6.8L 3V engines are some of the best and most durable engines Ford has ever built, but like Superman, they have a Kryptonite weak link. In this case, it's the OE Motorcraft spark plugs. They don't typically fail in service but often break upon replacement, leaving a piece in the cylinder head that can lead to an expensive repair.
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