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Spark Plug Voodoo
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Posted by Peabody on February 14, 2004 at 16:52:47 from (205.188.209.82):
Miserable day today in Central Alabama, mid 40's, breezy and light rain. I went out to crank my Super C and Cub. I must have the C in perfect time, cause it turned over about a quarter turn and fired right up (6 volt and all) and purred like a kitten. After a minute or so, I mounted my Cub to start it and suddenly the C started to sputter. It
was definitely running one three. I pulled the number 1 plug wire and there was no difference, so I knew that was the culprit. When I went to reattach the wire, when close enough to hear the spark jump, it ran smooth as silk, but when I attached the boot to the plug it ran rough again. I removed, cleaned and regapped the plug, but the same result. I swapped plugs and it ran just fine. I am going to replace all plugs next week. What causes this phenomenon that the plug fires fine when the wire is held just away and the spark is allowed to jump it runs smoothly, but when the wire is attached to the plug it won't fire?? Oh, by the way, the Cub started and ran like a champ!
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