Question about 1994 Chevrolet S-10 Blazer

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H.E.I. ignition module keeps burning out.

I have a 1884 chevy pick-up with a 305 engine. I'll replace the module, it will start a few times. I let the truck sit over night, the next day nothing. This has happened twice in the last week. Last summer I replaced the coil, condensor, rotor, cap etc. lasted for a couple of months. Then the same thing, the ignition module goes out ( I assume ). I've had the truck since it was new and its still a very good vehicle. I put a new one in yesterday, started, drove it around the area for a few miles, this morning, no spark. It snowed a couple of inches last night and is about 10 degrees outside, so I haven't looked at it today ( I know, sissy ). When it does run, I just can't trust it in the mountains. After it quits, I use a timing light to keep from wearing my battery down.
Could I have a 12 volt line possible burning it out overnight?

Thanks; Mike B, Grand Junction Colorado

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  • mountainman1 Dec 20, 2008

    turned out it wasn't my H.E.I. module burning out. I had an intermittent ground problem on my secondary line on my coil. When I moved the distributor cap to replace the module, the ground would make contact, after a little vibration from the engine running it would loose connection.. It was the connection that the coil sits on inside the upper portion of the dist cap.

    Mike B., Grand Junction CO.

  • zztodd66 Feb 15, 2009

    what did you end up doing to fix your ground?

  • Anonymous Mar 05, 2009

    I have the same problem, I put 4 coils on my 350 chevy truck it run good when it runs but now I can't get it to turn over help !

  • mikehumble May 11, 2010

    Your HEI distributer only needs one wire hooked to it to work and that is the power lead if this had 12v all the time the truck would not shut off.

  • Howard Lester May 11, 2010

    Do you use dielectric grease between the module and the distributor?



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SOURCE: 1990 chevy lumina apv - pickup coil -runs ok 15 mi & stalls

there's a roll pin that goes thru the drive gear.I'd change the ignition coil before the pick-up coil, if the pick up goes you'd be lucky if it would run above idle.if it has no power when it does run, try the ignition coil first.

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SOURCE: 1992 Chevy G20 Van Dies

I had the same problem after it sitting over the winter. I changed the fuel filter and added water remover to my gas and let it sit over night for the water remover to work and the next day it ran fine.

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SOURCE: No spark. Have a '91 S-10 4.3L. Drove to work,

check crank position sensor, run scanner for trouble codes , some auto parts will do this for free

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SOURCE: 81 chevrolet corvette will not start.

Check the hall effect switch in the distributor. That will cause this problem for no spark

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SOURCE: 1996 chevy truck 305 new rotor and distributor cap

did you test or replace the crankshaft position sensor? That is where the spark signal begins.

Posted on Sep 24, 2010

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