Sparkplug Wars
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Joined: Sep 2009
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Sparkplug Wars
I read several of the threads about blown sparkplugs in the Ford Triton engine. I have a 2003 Ford f150 4x4 with the 5.4 engine and 65,000 miles. I decided to check and replace the plugs before the 100,000 mile recommended interval. The engine was cold when I performed the work. I found 7 of the plugs in good shape. One plug had signs of early failure. The #4 piston (passenger side rear cyclinder). Also, the hardest to reach of course. The plug had obvious carbon scoring above the threads from what I assume was blow by. The plug was not in as tight as the others. I am the orginal owner of this truck and these were the factory plugs. I put in new plugs along with a little anti-sieze. The spark plug threads in the #4 cylinder felt pretty tight and I was able to cinch up the new plug. Did I divert disaster or is time ticking? Has anyone had the same experience?
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Thanks for your input. The engine build date is 1-31-2003 according to the tag, so I might have the shallow thread design on the cylinder head. I have not had any coolant leaks with this engine. The substance on the old plug is black and powdery like carbon. The electrode is not fouled, so I am still thinking along the lines of a small gas leak. I noted that the sealing ring on the spark plug has small erosions. The COP boot is not heat damaged, but had a light off color.
Cross-Country
Joined: Aug 2003
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Mine blew out at 101,000Used a timesert kit and have 40K more spark plug trouble free miles.
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