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Ignition Help

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6

69gts1

Freshman Member
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1970 Tr6 Plug fouling
Was driving the 6 the other day & it started running rough.
Got home & started pulling the plugs all were fine except #3 was gas fouled.Replaced plug wire & Dist cap went for a ride and a mile down the road same thing again.Grounded a spare plug against the block & at idle it appeared to fire normally but as soon as you give it some gas it does not fire. Car has Pertronix Conversion I installed about a year & 300 miles ago.Never had a problem Any Ideas I assume its thr Pertronix but why only 1 Cylinder
Thanks
Sal
 
Sal - if three plugs are firing and one isn't - when under load - how about the possibility of that one ignition wire being bad? Maybe broken/loose at the plug connector inside the rubber boot, or broken/loose at the distributor connection?

Just a thought.

Tom
 
Perhaps it is the plug itself. They can go bad... and they can also collect carbon tracking in hard to see places that keep them from firing.

Are you saying that the spare plug grounded to the block stops firing when you rev the engine?
 
Try swapping first the plug and then the HT lead with another cylinder. If the problem moves, the component you moved is the bad one.

Another possibility might be the magnet ring for the Pertronix. I've heard of the little magnets moving or even falling out.
 
Thanks for the replys Tried all that already all plugs are firing except #3 tried switching the wire with #4 to see if the problem moved there did not #3 still fouled out Did not look at the pertronix itself yet will do that keep the ideas coming
Thanks
Sal
 
Good point about the magnet ring. They are symmetrical aren't they? Perhaps reposition the magnet ring by 120 degrees to see if the lack of spark moves to another cylinder.
 
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