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Old 12-07-2009, 19:56   #1 (permalink)
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confused Coil Pack and Spark plug pushed out 98 navigator

I was driving today when a wierd noise came from the navigator. I stopped and pooped open the hood and saw the coil pack moving up and down out of the number 8 cylinder. No warning lights etc came on. What could the problem be?

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Old 12-07-2009, 20:14   #2 (permalink)
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Re: Coil Pack and Spark plug pushed out 98 navigator

Looks like the plug was not tightened and loosened enough to blow out, or was tightened to tight and when the aluminum cyl. head expanded, it finally blew the threads out. You'll more than likely need a threadsert installed. It takes a special tool to repair that.
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Old 12-07-2009, 20:18   #3 (permalink)
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Re: Coil Pack and Spark plug pushed out 98 navigator

How long would it take for this to happen? My dad thinks it is piston contact. Those spark plugs have been in for months since the last major tune up this summer.
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Old 12-07-2009, 21:02   #4 (permalink)
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Re: Coil Pack and Spark plug pushed out 98 navigator

The piston won't hit it. Sometimes it takes awhile for the plug to blow after changing them. They only have a few threads at the bottom and they seat at the top area. If they're tightened a little to much, thead cylinder head expands and pulls on the threads. They finally give way. There's nothing wrong with the piston.
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Old 12-08-2009, 09:57   #5 (permalink)
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Re: Coil Pack and Spark plug pushed out 98 navigator

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Originally Posted by rtg143 View Post
The piston won't hit it. Sometimes it takes awhile for the plug to blow after changing them. They only have a few threads at the bottom and they seat at the top area. If they're tightened a little to much, thread cylinder head expands and pulls on the threads. They finally give way. There's nothing wrong with the piston.
What kit would you recommend me getting? Ive searched and seen everything from a time sert (expensive) to a kit that much cheaper at autozone.
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Old 12-08-2009, 10:12   #6 (permalink)
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Re: Coil Pack and Spark plug pushed out 98 navigator

This is the tool to do the repair. It's not chaep. You may find one elsewhere. Lisle 65900 Ford Spark Plug Rethreading Kit
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