06, f150 supercab, 4.6L, 47K miles. i've read folks are saying 75K to 100K miles for a changeout. what say you?

 

I say if it ain't broke don't fix it. I'm going to wait until I have a problem that is spark plug related before I change them.

 

Well you will not have to worry about breaking a plug Do it I used to change plugs at 30k miles on older motors I have a 2004 5.4 3v motor with 18000 miles I would never try to do a plug change my self Because of the stories of plugs snapping off

 

How often do you change your oil ?? Or are you going to wait until your oil pressure needle does not move until you fix itI think its called maintance to prevent future problems ..

 

And technically Ford has rated these plugs to be good for 100K miles so its not maintenance to change them out until then. Unless of course they are causing you a problem. So "if it ain't broken, then don't fix it" like FX41 stated is a true statement.


http://genuineservice.com/genuineser...llView?popup=1

 

You're wasting your money changing the plugs when it runs well. My cousin's work truck still had the original plugs when he replaced it at 213,000 miles. He said it still ran as well as it always did and the fuel mileage was the same. My 4.6 Lincoln still runs well at 128,000+ with the original plugs.

 

But with my 2006 still under warranty isn't there some logic to having the dealer change them now. If 3 of 8 break and he has to spend hundreds or thousands getting the broken bits out...it's all under warranty, no question. But if I get them changed or change them myself out of warranty and they snap, isn't it likely I'll foot the bill to clean up the mess?

 

I'm pretty certain plug changes are not covered under warranty. Plus, IIRC, the problem was fixed by 06, wasn't it?

 

the original poster was asking about a 4.6L motor which apparently doesnt have the "snapping plug" problem. Also, i think that if the dealer brakes your plugs, its not covered under warranty.

 

Ford said they were good till maybe 100,000. That has proven to be on the short side as others have stated. The plugs will tell you when they need to be changed. Your engine will begine to run rough and gas mileage will suffer. I would go at least 100,000.

For those with the 5.4 breakage problem, no Ford does not warranty the plugs.

 

I havent changed mine at 71k, no real loss of mileage or anything, Ill probly do it at 75 just because

 

I can tell you that I just replaced mine at 87K. I had a misfire code at 6. When I pulled them they looked ok but the gap was up to .065 which is pretty wide. I could have re gapped them and put them back but I chose to replace with NGK irridium plugs instead.

 

72k miles here, not expecting to consider changing until in the 100k zone.

 

I've got 74,000 miles on my 2005 and I just can't believe they're going to last 100,000 miles - or come out without heroic effort (and cubic bucks) if I wait that long. So, I've already talked to a Ford Tech friend of mine who will be changing them out in a month or two. in the mean time, I'm running Techron in every tank in an effort to dissolve as much carbon as I can. We also agreed that he's going to let the carb cleaner soak all night in the plug bores to see if that further loosens anything. I'm keeping my fingers crossed though.

 

My 2000 had 96k on it with the original plugs on it when I treaded it in for my 05 and it still as good as the day I drove it off the lot. So I say shoot for 100k that is what I plan to do with my truck.