'99 - '03 Cylinder Head Problems On 5.4L

Has anyone experienced or know of anyone who has had a sparkplug blow out of their cylinder head and strip the head threads for no apparent reason? Apparently there are 100's of people across the country that this is happening to and Ford is not admitting to any wrong doing. It seems that the #3 sparkplug hole on the passenger side only has 4 threads making it susceptible to thread stripping, even with the originally installed sparkplugs. Was curious to see what people had to say about this problem.

Bob

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Robert Krecak
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Reply to
Ole

THe problem is that Ford used a improper torque spec and head/plug design and they loosen up and wobble until the threads are eaten away by hot gas errosion and plug rattle and then they blow out. Stell and aluminum has defferent expansion rate when heated which aggrevates the problem) Ford redesigned head and changed plug type to fix problem. If you have a old one, do not panic, just make sure plugs are snug/tight and check them again after a few thousand miles and see if they are lossening. Also check them warm, not cold as they will get tighter when they are cold as aluminum contracts around threads. Whn you remove them for serviceing, do it from a warmed engine, not a cold one.

----------------- The SnoMan

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SnoMan

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IYM

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