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2004 - 2008 Ford F150 General discussion on the 2004 - 2008 Ford F150 truck.

Spark plug unscrewed itself?

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Old Mar 10, 2013 | 01:32 AM
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Default Spark plug unscrewed itself?

A couple months back I was driving my truck and all of a sudden a loud air shooting noise starting coming from under the hood. So I pulled over and tried to find the problem and it sounded like it was coming from behind the intake manifold so I putted the truck to autozone right down the street and the employees there came out an said it was probably a crack in my exhaust manifold, they tried to get me to order one from them but I held off good thing I did cause it was a spark plug that had came loose that I only had to replace. Has this ever happen to anyone else??
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Old Mar 10, 2013 | 08:07 AM
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I bet you got the 5.4 engine.
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Old Mar 10, 2013 | 09:05 AM
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Typically this happens with the older 5.4 but be careful because it will probably happen again.
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Old Mar 10, 2013 | 12:31 PM
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Originally Posted by OldMansTruck
Typically this happens with the older 5.4 but be careful because it will probably happen again.

So they plugs wont come out of the older engines when you want them to, but they screw right out when you don't want them too.


Glad I bought a Ford.
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Old Mar 10, 2013 | 01:08 PM
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Actually I have 2008 4.6L lol well I bought all new plugs and replaced them. Hopefully it doesn't happen again I'm just glad no crud got down inside the cylinder. 👍
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Old Mar 10, 2013 | 04:55 PM
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4.6 only had 4 threads in the heads and the plugs like to back out. A lot of times it will mess up the threads and you have to use something like a timesert so you don't have to replace the head.
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Old Mar 10, 2013 | 07:30 PM
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This happened on my ol B2200 and I had to helicoil the thread. If you still got threads, torque the plugs down to spec. And recheck in a 100 miles or so. Then hope that it doesn't happen again haha
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Old Mar 10, 2013 | 11:08 PM
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This happened on my 06 a few months back but I caught it before anything bad had gotten to happen. I was lucky because I was in the middle of a plug change and it happened on 2 plugs on the passenger side dropped my socket into the cylinder head put my extension in and was scared real bad because it just started to spin by hand.... Thankfully the threads were fine I torqued them to spec checked them again after 120k and they were good! Just regular maintenance and some anti seize does wonders
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Old Mar 10, 2013 | 11:37 PM
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How many miles were on your truck when this happened?
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Old Mar 10, 2013 | 11:39 PM
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Originally Posted by mmz77
How many miles were on your truck when this happened?
Mine or OP? My truck had 198,000kilometres
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