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I put a new set of Taylor spiro red on my 88. They are routed the same as the factory wires. In the pitch black I still see some arcing between the wires and the exhaust manifolds. The wires are not touching anything. The closest they get is about a quarter inch from the pipes or the heads.
The car runs much better than it did with the original wires. I still notice a slight miss at cruise speed. Thats why I checked for arcing again. Any ideas? Should I send these back?
Current will always find the easiest path to ground, so my thinking is that your plugs are creating greater resistance for the spark to jump than exists between the wire and exhaust. So the current chooses the easiest path; easier to jump to the exhaust than to jump the spark plug gap.
You can try a few of things:
Install new plugs with factory recommended gap
Regap your existing plugs to the factory recommended setting
Apply some type of insulation on the wire to prevent the arcing
Increase the distance between the plug wire and the exhaust.
It is more like a glow. Looks like a corona effect. It happens when the throttle is first opened only. At idle there is nothing, held at about 2500 rpm no arcing. Seems like it only occurs under load. My plugs have the ground electrode cut back, and gapped to .045".
Corona effects is very common, and many have mistook it for arcing.I wouldnt worry about it if, its just a glow and not actual sparks jumping around and causing misfires.