You know, I bet a lot of people aside from myself are tired of you trying to answer questions when you really don't know the answer. It's not helpful, and you end up steering people in the wrong direction.
Some of the early Ford 3V's had an issue where build up between the plug and the wall and glue the plug in place. When the plugs were removed they would break the cylinder head and require a lengthy and expensive repair. Not something Ford could really test for in the short term, but there ya go.
Older vintage 2V / 4V's had the plug ejection issue. This is being report to have been caused by less threads on the spark plug and spark plug holes.
These appear to be both 4.6 and 5.4L issues.
From about '04 on, it appears you won't see any of these issues. In addition, at this date, there are no lawsuits regarding the issues that I've been able to find. All the information I posted here is public knowledge that can be found with a little google work.
That is NOT to say, by the way, that all the Ford engines from that era (4.6L 5.4L) had this issue. I know a huge number of people who own vehicles with these engines who haven't had the problem at all.
It's a bit of crapshoot though. You change your sparkplugs, what, once or twice over the life of your vehicle (unless you're a maintenance fanatic or your engine eats plugs for breakfast). There are a lot of other issues out there that happen far more often, and not just to Ford. This one seems to have been getting some play lately though in the press.
