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3rd Ignition module in under 1K miles ...

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Old Apr 26, 2018 | 09:31 PM
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Default 3rd Ignition module in under 1K miles ...

So I have gotten flat-bedded home for the third time in under a year or less then 1K miles. So I have checked and monitored the voltage going to the module from the ignition. Replaced all electrical components in the distributor, checked play and can't find anything wrong.

I am wanting to replace this BS HEI distributor and get something else. Any suggestions on how to fix this?
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Old Apr 26, 2018 | 09:35 PM
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Originally Posted by Skybolt
So I have gotten flat-bedded home for the third time in under a year or less then 1K miles. So I have checked and monitored the voltage going to the module from the ignition. Replaced all electrical components in the distributor, checked play and can't find anything wrong.

I am wanting to replace this BS HEI distributor and get something else. Any suggestions on how to fix this?
all? including mag pickup?
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Old Apr 26, 2018 | 09:48 PM
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Originally Posted by calwldlife
all? including mag pickup?
Yep, mag pick up as well. Totally stumped ...
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Old Apr 26, 2018 | 09:49 PM
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Did you use the heat sink grease?
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Old Apr 26, 2018 | 09:50 PM
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Originally Posted by Skybolt
Yep, mag pick up as well. Totally stumped ...
what manufacture of the cm?
did you have the bad ones tested?
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Old Apr 26, 2018 | 10:01 PM
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What spark plug gap are you running? I've heard wider gaps can be hard on some parts, especially in the Chinese HEI distributors.
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Old Apr 26, 2018 | 10:15 PM
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I used a Pertronix flame thrower kit from Jegs, with all replacement parts. I did that after the 2nd failure. The first fail was right after I got this car, didn't think much of it. Then the 2nd fail and I did the above replacement. Now not even 250 miles later it failed again.

So new HEI distributor or MSD system.
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Old Apr 26, 2018 | 10:17 PM
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Nope did mot test anything, just replaced parts.
Stock NGK pre gaped plugs.
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Old Apr 26, 2018 | 10:20 PM
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coil change?
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Old Apr 26, 2018 | 10:32 PM
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Originally Posted by Skybolt
Nope did mot test anything, just replaced parts.
Stock NGK pre gaped plugs.
I checked a couple new FR5. They were both .040, so probably not the issue.

You might try a post on Speedtalk.com in the engine section. There are some good guys over there with big brains, and lots of other good info there if you like engines.
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Old Apr 26, 2018 | 11:01 PM
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Originally Posted by Skybolt
I used a Pertronix flame thrower kit from Jegs, with all replacement parts. I did that after the 2nd failure. The first fail was right after I got this car, didn't think much of it. Then the 2nd fail and I did the above replacement. Now not even 250 miles later it failed again.

So new HEI distributor or MSD system.
Use a Delco system. I would rebuild a stock unit.
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Old Apr 27, 2018 | 01:22 AM
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Originally Posted by Sayfoo
Did you use the heat sink grease?
Originally Posted by calwldlife
coil change?
I fought the same problem for months. The correct "grease" is important. I fried a module by using the wrong white "grease". Does the spark plug wire throw a long blue spark when near the tip of the spark plug? A weak coil will produce a yellow spark.
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Old Apr 27, 2018 | 06:51 AM
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Originally Posted by doorgunner
I fought the same problem for months. The correct "grease" is important. I fried a module by using the wrong white "grease". Does the spark plug wire throw a long blue spark when near the tip of the spark plug? A weak coil will produce a yellow spark.
Yes a nice blue spark, as for the grease, I used what came with the module and lots of it.

The coil was part of the Pertronix kit. Everything new in the distributor.

What was the fix for your situation?

Last edited by Skybolt; Apr 27, 2018 at 06:51 AM.
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Old Apr 27, 2018 | 08:54 AM
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We have another thread going on a similar issue. Go back in there with the original GM Delco parts and trash those Flamethrower parts. Start there and see if it goes away. Worked for me.
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Old Apr 27, 2018 | 08:57 AM
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Originally Posted by stingr69
We have another thread going on a similar issue. Go back in there with the original GM Delco parts and trash those Flamethrower parts. Start there and see if it goes away. Worked for me.
Thanks.

Right now I am replacing the distributor with an Autozone model just to get the car going again until I decide what to do. The Delco one is an option and actually is what Autozone had in stock so guess that's a start.
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Old Apr 27, 2018 | 09:05 AM
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Originally Posted by HeadsU.P.
Heat Sink Compound. Little harder to find. Insulates and keeps Modules from receiving damaging heat soak which breaks open internal circuits.
It does not insulate. It conducts heat away from the module to the alum. body of the dizzy. THAT is the heat sink.
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Old Apr 27, 2018 | 09:40 AM
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Originally Posted by Big2Bird
Use a Delco system. I would rebuild a stock unit.


Otherwise, if you want to upgrade the ignition, get a programmable ignition system. Why waste money on a GM HEI clone?
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To 3rd Ignition module in under 1K miles ...

Old Apr 27, 2018 | 10:15 AM
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Make sure the TACH wire is not grounded out anywhere from the plug in at the distributor to tach.

One time on a 350 I had a tach wire grounding out on the back of the left head. The tach would still always work fine, but it would burn brand new modules out every 2-3 weeks.....I was carrying spares in the glove box. Eventually I found the tach wire had soldered itself to the head.....


Just something to check.
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Old Apr 27, 2018 | 10:32 AM
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Originally Posted by resdoggie


Otherwise, if you want to upgrade the ignition, get a programmable ignition system. Why waste money on a GM HEI clone?
Can you recommend one, I think that's the way I am going to go. I never really liked the HEI distributors.
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Old Apr 27, 2018 | 10:33 AM
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Originally Posted by ajrothm
Make sure the TACH wire is not grounded out anywhere from the plug in at the distributor to tach. ...
Now that is a possibility, Thank you.

Real nice cars BTW
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