You only want to use Motorcraft or Autolight copper plugs - for some reason the platnum plugs cause issues.
The torque spec is VERY IMPORTANT on that year of 5.4 engine. Its an aluminum head with only 4 threads on the splug, its extremely easy to strip the threads by over torque (only 12 to 14 ft. pounds torque).
Its also not uncommon to strip the threads out of the head when you loosen them - the aluminum galls to the spark plug and just rips the out. So make sure you can get the wrench on square.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
... [Read Article]
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