i have recently bought a 2000 f150 that has the 5.4l and has 97k on it. so far it has had a smooth idle and such. question is, should i just go ahead and have my sparkplugs replaced now or just leave them alone being its running fine now. and also does this plug problem occur to ALL 5.4 engines or no?

thanks for the help

 

Why fix what isn't broke?

Unless you have MPG or performance issues I wouldn't bother with it yet.

 

Which plug problem? The broken stem? That is only on the 04 up. If you mean the problem of blowing out of the head, that was the 99 or 2000, and changing them won't eliminate that problem.

 

yup I used to change mine at 65,000-80,000 even though manual didn't request it until 100,000. Given how much of a pain it is, and the damage that can be done by changing plugs (for example, I snapped a bolt as I was tigtening one of the coils back down, it was back in the engine, don't want to guess how much that cost to fix) and other problems, jsut leave it unless you have a reason to replace them.

 

They have most likely been changed already. You can pull #1 pretty easily to check the condition and gap. The gap increases with age and as they wear. If it's out of tolerance ( .52 - .56 ) more than .56 then they need to be changed.

 

Unless its like my explorer. Went ot the lot, checked it out. Pulled the easiest plug, looked great. Guess what, they'd changed 2 of the 6 plugs... the easiest ones, of course.

 

, Yea , I didn't think about that !! You might wanna change them just to be sure.

Or check #8 & 4 - If there good, it would be a safe bet that the rest are

 

I would cheack a few plugs and then pull all the COP's to make sure the plugs are not loose.