Question about 2004 Ford Expedition
#3 sparkplug is not firing at peak performance.
The engine block sparkplug hole had to be re-threaded in order to accept an adapter for the replacement spark plug. The sparkplug is sitting "higher" in the cylinder than the others (not as efficient).
It may even be a different sparkplug altogether in order to accommodate the adapter.
Add a silicone insulator gel (AutoZone $2) inside both boot ends of the sparkplug wires and re-seat them all.
Posted on Oct 01, 2009
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Posted on Jan 02, 2017
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