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Everything I quote in my posts comes directly from the Ford Service DVD. It's an older one.
I never, ever, ever use aftermarket manuals. Some people like them, but I think once they use a factory manual, they'll never go back. I also thought it interesting that Ford recommended different plugs for the left and right banks, too.
The plugs in the 4.0 SOHC are a piece of cake to change compared to the 4.6/5.4 engines.
With 95,000 on the clock there was absolutely no difference after installing new plugs. While I agree that it is a maintenance that should be performed I have NEVER had any results after changing spark plugs (including smoothness or MPG increases) unless the plug(s) were mechanically damaged or oil fouled. Regardless of the results, I still change them when specified.
BTW, Extremely good write up for people who are new to changing spark plugs. It will help save people money while ensuring a job well done.
I appreciate your consideration of all lifestyles lol! Great post, and even though I do know what's special about a spark plug socket, this did give me the reassurance I wanted to try and squeeze this in on a work night (in my garage, of course)