I've always been mystified why on certain occasions that the spark continues to jump anyway, considering the sparkplug body has no longer any contact with engine ground. Can anyone explain that please. I have even had it happen with the sparkplug lead connected directly to the sparkplug without a sparkplug cap, when I don't see any spark path upon the sparkplug ceramic insulator surface, so I presume the conduction path is not along the surface of the sparkplug lead.
Any ideas why this can happen?
I do realise it is bad to let this happen and that the coil insulation can be damaged, but that is not really what I'm concerned about right now. I'm just baffled why the spark jumps to plug body even though the body is attached to nothing.