Stockdale Dave said: (quoted from post at 14:19:11 08/18/08) Reread your post...meant to say that it was mostly factory plugs that were doing this not replaced ones. Thanks for the tip on the one piecers...now If I can get them in without pulling the heads.
2 valve engines are the ones that are touchy about replaced plugs blowing out. They came out in 1997 and went until 2003 in the F-150, later in the Super Duty, and I think they are still in the E-Series. This applies to the Winsor built 4.6, 5.4 and 6.8, the Romeo 4.6 didn't have the issue at all. Sometime in 2003 they added more threads to the head that elimanated the problem.
Too much torque and you strip out the threads really easy, not enough and the plug works loose and eventually rips the threads out... if caught soon however (it sounds like a lifter tick) it can usually be retorqued before any problems arise. The fix for stripped out threads is a timesert which is a hardened steel insert you put in the head... gotta pull the head to put this in the back ones though.
In 2004 the 3 valve engines started coming out and had to have a goofy extension to get down to the combustion chamber. This extension was crimped on and when carbon gets built up around this extension and the cylinder head it can pull off of the rest of the plug when they are changed and stay lodged in the engine. The sooner you change these while following the TSB to the one piece plug the better before carbon has time to buildup the easier it will be.
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