Posted by John B. on May 26, 2009 at 20:41:55 from (38.114.64.218):
In Reply to: Cracked coil, why? posted by erikyater on May 24, 2009 at 21:40:15:
Are you sure the coil tower is cracked and sure it's not a carbon arc?
A carbon arc is created in a dist cap or any where on a high voltage part of the ign system. A carbon arc looks like a crack but is actually carbon left behind where spark jumps on the surface of an object for a number of times or a continous amount of time thus making it easier for the spark to travel on this carbon arc than jump all the given gaps withing the ignition's system such as from the rotor to the cap then to the spark plug gap.
A carbon arc will look like someone took a lead pencil and drew a crooked line on the part where spark is jumping.
I find it very had to believe that your coil is cracked. If a coil gets that hot it will usually push or swell the bottom of the coil outward! See if the bottom of your coil is rounded instead of being flat.
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