ORIGINAL: dalosiman
it may just mean that the platinum coating on the plug wire is worn off not allowing that portion of the wire to glow, if the plug still works and your car runs ok with it then by all means dont worry about it. I have run plugs with all but the last 2 rings not glowing and they worked fine.
Yeah and it will differ from engine to engine as well...
I have a Epic18 that can run with the bottom coil to coil and a half not glowing and you really can't tell a difference.
My SH28 on my Savage will start beautifully with one coil not glowing but give it ANY throttle and it just dies...