986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post

Steve Tinker · 12-30-2010, 09:09 PM

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.....

12-30-2010, 09:09 PM	#4
Steve Tinker Registered User Join Date: Dec 2008 Location: Queensland, Australia Posts: 1,522	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..... __________________ 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 09:11 PM.