I own a 2001 F-150 with the 4.6 and and hear all the horror stories, so I didn't want to mess with it myself. I took it to the local Ford dealer and they recommended performing a "motor vac" that supposedly cleans the combustion chamber and in the process the spark plug threads. My truck has 151,000 miles on at the time, plugs never been changed. They did the "motor vac" and changed the spark plugs and installed new coil boots, to my knowledge they had no issues removing the old plugs. Maybe they B.S.ed me on the motor vac, I don't know, but I do notice the engine runs smoother and picked up a little mileage but I've only put on 1,000 miles since the work was done.
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Today's Featured Article - Talk of the Town: Winterizin Engines - To Drain or Not to Drain? - by Staff. Another great discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "Winter is fast approaching..for a gas tractor should the gas tank be drained and run the engine til the carb is dry or do the gas stabilizer products I've heard of work? (tractor will not be used til spring) any other tips for winterizing?? "
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