Posted by JMOR on August 14, 2009 at 21:49:00 from (72.181.157.9):
In Reply to: Spark plug missing posted by Jeff Z. on August 14, 2009 at 19:09:59:
As the others have said, you have an underlying problem. The "pull the wire off a quarter of an inch" deal is only temporarily overcoming the difficult to fire spark plug. If you ran it like that for awhile, it would happen again as the plug becomes more fouled.
What is going on here, is that the additional quarter inch allows the coil voltage to build to a higher voltage before the arc occurs & at the level, your fouled plug will fire. Coils will elevate their voltage to whatever voltage is necessary to discharge (even if it means arc over within it's own windings).
A fouled plug allows the coil to "leak-off" rather than arc & produce a spark, but when you interpose a quarter inch gap, you interrupt this "leak-off" path.
Would you believe there was once a device sold for the purpose of introducing your quarter inch gap?
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