HEI coil - Team Camaro Tech
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post #1 of 5 (permalink) Old Mar 1st, 04, 10:46 AM Thread Starter
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Join Date: Aug 2002
Posts: 32

Is the coil on an HEI either good or bad or can they be intermittent?

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post #2 of 5 (permalink) Old Mar 1st, 04, 04:21 PM
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Join Date: Mar 2002
Location: Austin, TX, USA
Posts: 5,277

Generally yes, the coil is either good or bad. But anything is possible. Especially if the coil has been overheated at any time it may develop and internal bad connection.

More likely is that the ignition module is intermittant. Another possibility is that the pickup signal is week. Pickups are even less likely than a coil to go bad. But the magnets can become weak over time and not supply an adequate trigger pulse for the module.

What kind of problem are you experiencing exactly? Is it a misfire problem. There are other potential causes.

68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
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post #3 of 5 (permalink) Old Mar 1st, 04, 06:13 PM Thread Starter
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Join Date: Aug 2002
Posts: 32

What I have is the car will die at low speed or backfire at high speed as if there is a loss of ignition. The car will restart every time on the first revolution so I figure there is fuel in the carb then run for awhile and die again. The car has yet to die in the garage or driveway either at idle or under load. It has had 2 modules put in and new plugs and plug wires. The cap looks fine and the connections look good. I have wiggled wires when it is in park and it will not conk out. I have not checked for a vac leak or the timming due to lack of tools. The odd thing is it has run good for a long time. It is a 68 so there could be brittle wires I guess. This should not be that hard to figure out. It has a new fuel filter and the carb has been swithed out as a test.

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post #4 of 5 (permalink) Old Mar 8th, 04, 03:09 AM Thread Starter
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Well it turned out to be a bad coil afterall. I put on a new one and the car ran great. Just for grins I put the original one back on and it ran crappy.

Thanks for your help...you guys are the best
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post #5 of 5 (permalink) Old Mar 9th, 04, 04:57 AM
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Join Date: Jul 2001
Location: Portland, Or
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Good to hear you fixed your problem. For those of you doing a search on this down the road, many parts stores have the capability of testing ignition modules-call around.

1968 C10 SWB Torch Red
1968 Camaro, 250\Powerglide, all original (No, I'm not gonna drop a 350 in it!....Jeez!)
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