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Looses spark. give your opinion please.

931 Views 5 Replies 4 Participants Last post by  [email protected]
Working on a 71 chevelle with a 454. Has a HEI dist. After reving the car up it missfires. I checked with a spark tester and when it missfires it sparts 5-6 times then no spark 1-2 times then sparks again. My thought is it has a coil going bad. The module is possable but when they have gone bad on me they loose all spark. No missfire like this is doing.

Any other ideas?

Thanks Rich
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Rich, use a vacuum pump, one of the hand held deals, to activate the vacuum advance at idle, see if you get the problem.

If you do, use a pair of needle nose pliers to pull on the little wires where they come out of the pick-up coil in the HEI. Sometimes these get old and break inside the insulation. Pull on the wires gently, if one of them is more like a rubber band than a copper wire you've found the problem.
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