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Old 09-19-2007, 07:14 PM
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GM HEI Module Keeps Burning Out

Hello,

-Put in a new 350 crate motor in 2005. It came with a new HEI distributor, pretty much stock unit, think it was made in China.

-It ran great for about a year, then wouldn't start. Traced it to the HEI module (the four pin style). Bought a new module at GM dealer (it's made in Singapore) and installed it with all of the special grease it came with.

-Again, ran great for almost exactly a year, then wouldn't start again over 4th of July 2007. Same thing-new HEI module from dealer, used all the special grease.

-Today, after only 2 months later, the HEI module burned out again. I had an old spare one and swapped it out, and it fired right up.

-Does anyone have ideas what else could be causing these modules to burn out? Or am I just unlucky to have gotten 3 bad modules? Instead of just buying a new module this time, thinking about buying a new, better quality HEI distributer and just getting the new module that comes with it--but if there is some other reason for the modules burning up, this new distributor will not really fix the problem.

-Any ideas or past experience with fixing the real cause of this problem will be very much appreciated.

-This is in a 59 chevy pickup, so there is tons of room under hood and seems like the engine doesnt run real hot, so don't think underhood temperatures are super hot.


Thanks,
rvh

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Old 09-19-2007, 07:32 PM
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make sure that your coil has the little ground strap installed under the dust cover.
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Old 09-19-2007, 07:43 PM
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And then check to see that you have 14vdc at the coil wire while the car is running.

Don't feel bad----I have experienced the same thing more than once.
After the module cooled off a bit, it ran fine>>>>>>for a while.

went totally boobies up in my driveway backing out. Silly module tested okay---but I knew better

After a couple of these incidents---I went ahead and changed the coil, cap, module.

Might want to keep a spare in the glovebox

Bryan
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Old 09-20-2007, 01:43 PM
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Condenser

Doesn't the HEI have a condenser? Its in there for the same reason you have one on a points system - eats the inductive kick that also tries to "fire" across the primary side of the coil circuit when it is suddenly opened. If the condenser is bad - the inductive kick will also try to eat the power transistor that is in there replacing the points - or maybe the dwell timing computer chip, whatever. In any case, it is a necessary part of the system if you are trying to get reliability.

Maybe you need a new one........otherwise dunno what to guess.....
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Old 09-20-2007, 02:11 PM
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I had a problem and it just kept getting worse. I was going thru modules a lot. A friend gave me an HEI I had laying around and I put it in 3 years ago. I'm still running on it. (That is probably the kiss of death, I'll bet it goes bad this weekend just for saying it)
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Old 09-24-2007, 08:55 PM
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Quote:
Originally Posted by ripvanhalen
Hello,

-Put in a new 350 crate motor in 2005. It came with a new HEI distributor, pretty much stock unit, think it was made in China.

-It ran great for about a year, then wouldn't start. Traced it to the HEI module (the four pin style). Bought a new module at GM dealer (it's made in Singapore) and installed it with all of the special grease it came with.

-Again, ran great for almost exactly a year, then wouldn't start again over 4th of July 2007. Same thing-new HEI module from dealer, used all the special grease.

-Today, after only 2 months later, the HEI module burned out again. I had an old spare one and swapped it out, and it fired right up.

-Does anyone have ideas what else could be causing these modules to burn out? Or am I just unlucky to have gotten 3 bad modules? Instead of just buying a new module this time, thinking about buying a new, better quality HEI distributer and just getting the new module that comes with it--but if there is some other reason for the modules burning up, this new distributor will not really fix the problem.

-Any ideas or past experience with fixing the real cause of this problem will be very much appreciated.

-This is in a 59 chevy pickup, so there is tons of room under hood and seems like the engine doesnt run real hot, so don't think underhood temperatures are super hot.


Thanks,
rvh
If installed in an old car make sure your hot wire does not have an internal resister. HEI likes nice big 12v hot wire with no resistor.
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Old 09-24-2007, 11:28 PM
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High secondary resistance (or an open-circuit condition) will fry an HEI module.
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