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Yes it can happen - age and temperature tend to crack the insulations in varying degrees and once moisture enteres the equation, voltage mistracking will follow.
You can find that one coil is delivering 80% of the voltage to the plug and losing 20% through the breakdown in insulation but still fire the cylinder OK - the next plug along could be losing 30% of its prescribed voltage giving a CEL and reduced performance (missfire).
If you live in a harsh enviroment the coils have a shorter lifespan than in a warm dry climate.
I guess you should replace all 6 coil packs - you should feel the difference in performance too.....
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
Last edited by Steve Tinker; 12-30-2010 at 10:11 PM.
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