Originally Posted by Scooterdog
Having done this quite a few times, The best chance for success is to run the socket like a tap. 1/16 of a turn out-1/32 of a turn in, 1/16 of a turn out- 1/32 of a turn in. Go slow and work the plug by feel. Once you get the plug 1/4 of a turn our, run it back down in and start again. A few different length wobble drive extensions and a long breaker bar works the best to get the plug started out. My 8 for 8 success rate with this method is very good. Dynotech is 110% correct you NEED the Lisle 65600 as plan "B".
I have yet to do this chore, but I will do it myself soon. There is a great youtube video showing how to use the Lisle tool, and I'm all about saving money. The dealership close to me charges an extra $100 for each broken plug, and they assured me there would be a couple broken plugs. That plus plugs costing twice as much as the Motorcraft plugs from O'Reilly. That's $120 for plugs alone from the dealer. I can buy the Motorcraft plugs and the Lisle tool for $127 and do the work myself. It's a no brainer.