Question about 2003 Toyota Tundra

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2004 Toyota Tundra spark plug

One of my spark plug literally shot out of the cylinder head. I was driving about 65 mph and I heard this loud banging noise. I thought that my tire was going to fall off. It happened to be one of the spark plugs that came comletely out. What would cause this? I have to have the cylinder head rethreaded to have the spark plug replaced.

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  • bjonescj Oct 20, 2008

    Here is an updated. The cylinder had to be rethreaded and the spark plug and plug wires replaced. They stated possible spark plug was loose and damaged cylinder head from vibration. Another company had replaced the spark plugs with Autolite spark plugs in 5/2007. The spark plug blew out after putting 29641 miles. When I went back to the company that had installed the spark plugs they said that it was outside of the warranty and the the cause was due to metal fatique on the cylinder and not because the spark plug was installed incorrectly. He kept repeating that it worked fine for 30000 miles. I do not know if there were threads left in the cylinder when the spark plug blew out. What causes metal fatique and how can I determine the cause. Should I contact the company to see if there were threads in the cylinder head before it was rethreaded?

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The causes for spark plugs leaving the cylinder head are as follows:
1. The threads in the cylinder head were compromised, as in cross-threading.
2. The spark plug, when replaced, was not tightened down properly (like only 2-3 threads in)
3. A combination of the above.

Whe the plugs are fully seated in the cyl heads, and are at the proper torque, it would be extremely RARE for the plug to be jettisoned by the compression of the pistons. You only have roughly 175-185 PSI compression, this will NOT defeat the retention of the threads. Look at the hole in the head...How may threads are damaged? If it is just the end of the hole, the plugs was not in "all of the way". If ALL of the threads are bad, the plug was inserted improperly, and damaged the threads in the head. Rethreading (a "heli-coil") will correct you condition, if properly done.
Hope this helps.

Posted on Oct 01, 2008

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