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Old 07-19-2004, 08:55 AM
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Chevy HEI - Weak Spark

I've been having issues with my HEI ignition recently, and as i result of playing around with it a bit, I've noticed that I have a very weak spark, pink/orange in colour.

I thought the whole point of a HEI ignition was to produce a nice strong spark, as mine clearly isn't...?

I replaced the cap & rotor not so long ago & shortly after it had a new coil & module (which has now died again due to being cooked, got one on order).

Any ideas what might be causing it...?

Could it be the coil? Would I benefit from getting a new set of plugs & leads?

Thanks in advance for the advice!

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Old 07-19-2004, 09:04 AM
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The first thing I would check is make sure that you are getting 12 volts to the dist. It sounds like you may be using the ballast wire because that would cause low voltage.
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Old 07-19-2004, 09:14 AM
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I checked that while I was 'fiddling'.

There's 12.38 volts going into the coil.
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Old 07-19-2004, 02:12 PM
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Wires

[color=yellow]Doc Here

Replace the plug wires, sounds like they are now creating a high resistance Or broken down from age / heat.

If that Doesn't Cure the problem, open the Coil access door and Check to see that it is Clean and making good contact. No unspecified Lifeforms growing inside it...Coil is seated, and button is making good contact with the rotor. Also check the Ground Bar, the one that runs from the Coil frame to the plug...burnish the coil frame where it attaches for good contact.

If the Engine Module was on the way out, That would reduce the Spark...On the New one Be sure to clean all the old Dielectric Grease of the mount plate, and renew it with lots of new grease...(heat Sink Compound) Those Modules won't tolerate much heat at all.

Also if it dosen't improve, remove the Tach line (if used) and monitor the spark, If it goes nice and blue, you have something loading the line. (shorting tach, leads, or Computer Reference pulse, Some go through a Shaping Capacitor that could be bad.)

YES , since your only Wires and plugs away from a total tune up anyway, It would be in your best interest to just change it all out anyway. that way everything is done at the same time.

Doc
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Old 07-20-2004, 01:54 AM
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Cheers Doc! I'll get on the case...
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Old 07-25-2011, 09:58 AM
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This is an old thread so for those who come searching for HEI weak spark, you can try using a HEI distributor ionfire ignition system.
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