Question about spark plug repair?
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Joined: Feb 2008
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Question about spark plug repair?
I bought a 2001 Ford F250 with a 5.4L and what I belived to be a bad cylinder. Well I decided to confirm this with a compression test, however the plug threads are gone so hopefully that is the only problem. I did try to check compression on a couple of other cyl's but couldn't get the gauge to screw in, except for #4. Tried to look down the hole to see the difference and it looks like a fully threaded insert in #4. Does this make sense?
