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There's been so many stories on the plugs, mostly that the temperature rating is no good for a plug with a shield, or whatever the actual problem with the plugs was.
I have, however, been to 4 dealerships in New England, and after asking questions, I have always gotten the same exact answer. I've been told the plugs were essentially too long. Not so much noticably by looking at them, but just long enough (maybe less than millimeters) that they would "bottom out" in the head and sieze up right away. And the build up of carbon over time was no help. So Ford knew about it all along and did noting until recently, I was told. 2008 models built after a particular date (not sure what it was) are supposedly all set. The plug is not only a different temp, but a tiny bit shorter, allowing clearance so it will not bottom out. And from what each dealer has told me, my truck with a build date of August '08 is all set. I want to believe this, especially because it's several dealers giving me the same story, not just one tech or service manager trying to give me a simple wrong answer.
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