Explorer 2WD V6-245 4.0L VIN X SFI (1999)
Spark Plug: Description and Operation
The spark plugs:
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change high voltage pulses into spark at the gap, which ignites the fuel and air mixture.
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have a platinum-enhanced active electrode for long life. The active electrode is different for LH and RH sides.
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have replacements (with both electrodes Platinum-enhanced) so they can be used on either side.
