Ignition coil arcing

[phil430]

Hi, my chimaera has developed a misfire and is making a spark from the main ht cable to the left side nut, I’ve tried changing the ht cable but no change, any ideas?

[Belle427]

Looks like some evidence of tracking in the photo on the path to negative terminal.
Clean it all up well and check for any hairline cracks.

[phillpot]

Short term fix, clean and paint over where its been tracking with nail varnish.


Proper fix, new coil.

Edited by phillpot on Friday 21st July 19:05

[Belle427]

I believe it can happen too if your other ignition system components are not great ie cap, rotor.

[blitzracing]

If its not tracking, you have an open circuit in one of the HT leads or or missing carbon brush in the dizzy cap. Its far easier for a spark to jump a .8mm plug gap than to the negative side of the coil that's probably about 20mm,

[rev-erend]

There was a recall years ago for the coils. They are mounted in a hot position, so it's possible yours has some damage.

[phil430]

Thanks for all your replies, it was a faulty ht cable to the coil

[phillpot]

phil430 said:

Thanks for all your replies, it was a faulty ht cable to the coil

But you said you'd replaced it? with another faulty one?