Well yesterday I change all my spark plugs and coil packs and what a difference. I have an 01 S-crew with the 5.4 with 140k miles.
It took about 3 hours and was not too difficult just a lot of careful work and changing socket extensions.

The truck always ran good but there is a very noticeable difference in the idle (much smoother), acceleration and throttle response. I am sure mileage will improve but I don't track it.

I followed the direction on the forum and it all went smooth. You need lots of different extensions and I used the wobbley type extensions and not the swivel piece like some others. Removing the fuel rails made it a lot easier but now I know I need to clean my injectors after seeing them.

My engine was pretty dirty so compressed air was my friend and I blew everything out at each step.

It made such a difference I wish I would have done it long ago.

Here is a pic of my old plugs.

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Good to hear, I'm planning on changing mine before winter sets in as well. Did you use Motorcraft as replacements?

 

I did use the motorcraft.

 

Could you point me in the right direction of the thread on changing the plugs? I am looking at a couple of trucks on Sunday, and I think it would be good before winter.

 

here is the main one but also search. Despite what this article says you DON'T want to use anti-seize and torque to 28 ft/lbs. You also want to make sure you use diaelectric grease on the boots.

http://rmftc.com/howtos/sparkplugs/sparkplugs.html

I was amazed at the difference it made.

Galen

 

Thanks!