majerus

I have an 04 f150 which has no documented proof spark plugs were ever changed. (5.4) The truck runs fine, I just dont want to screw it up by attempting to change them. The truck has 203k on it , anyway the truck would be running fine with stock plugs installed? Any easy way to tell they are stock beyond removing one?

techrep

iTrader: (1)

No way... Can't be orginal and you gotta pull one to see..

screwf1fidy

Mine r original at 200k IV been thinking of changing them too

majerus

Does your truck run right?

techrep

iTrader: (1)

That's nuts..

screwf1fidy

It seems to

majerus

Let me know how your replacement goes. I am pretty good about "fixing" things then in the process breaking them.

weadjust

I got a 140k on my original plugs but it's 4.6. I have had new spark plugs, boots, and springs since 100k but the gas mileage hasn't dropped any so I keep putting off changing them.

Eco-Mica

iTrader: (1)

I can almost believe this. had an 04 5.4 160k before I changed them. miles started to really kick the bucket. took it to the shop, yep they broke 2 lucky it wasn't on me.

Nocturnal1

Please post pics of the plugs if you pull them out. It'll be interesting to see.