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Old 09-25-2016, 06:33 PM   #1
NASTY-LSX
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Keep blowing ignition module. Will MSD box make this stop??

I know I post this last year. But I have still not fixed this problem.

1. new wires
2. new spark plugs
3. new cap and rotor
4. New coil
5. new ignition module
6. replace dizzy with a good working GM 1

Just about everything needed. Yes I used the paste so the module would not heat up, and yes I cleaned all the old paste off before I put the new paste.

After all this new stuff, 2 min, later it blew the module again. GROUNDS ARE GOOD AND CLEAN ..

Will a MSD box with a external coil make this NIGHTMARE go away???
I am really lost what to do here.

The only other thing I can think of is the ignition box on the steering column. Could those go bad or create a short to blow out the modules??


Last edited by NASTY-LSX; 09-25-2016 at 06:43 PM.
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Old 09-25-2016, 09:28 PM   #2
ironroad9c1
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Re: Keep blowing ignition module. Will MSD box make this stop??

what "Paste" are you using?
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Old 09-26-2016, 11:28 AM   #3
NASTY-LSX
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Re: Keep blowing ignition module. Will MSD box make this stop??

forget the name, it come with the module. its not a grease. its a paste.
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Old 09-26-2016, 11:38 AM   #4
ironroad9c1
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Re: Keep blowing ignition module. Will MSD box make this stop??

OK have you done anything with the coil ? make sure the black ground wire of connected to he metal srip under the coil cover, second , Im not sure what paste they include , but heat to radio shack or any electronics store and get a small tube of Heat transfer paste , NOT the clear dielectric grease and only apply a thin layer after cleaning all the old stuff off the dist. This paste allows heat from the module to transfer to the Dist. body and dissipate . make sure you are not exceeding 14volts at the cap , and are getting over 12 volts. Underpowering is as bad as over powering.
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Old 09-28-2016, 06:32 PM   #5
NASTY-LSX
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Re: Keep blowing ignition module. Will MSD box make this stop??

update. Starting taking stuff apart to put a new module in. Here is what i found.

If Im correct, there should be a metal ground tab in the cap correct?? Looks like a hook end for ground? Nothing here.


Then i noticed the tach wire had a slit in it. (unplugged externally)



See the white looking soot on the black coil. It was all over the wires close to coil also..

You see the spring in the center!!


it looked funny, so I pulled it out, WTF!!! :shrug:
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Old 09-28-2016, 06:53 PM   #6
NASTY-LSX
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Re: Keep blowing ignition module. Will MSD box make this stop??

So the tab in the center is missing!! ground.

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Old 09-28-2016, 08:09 PM   #7
68Timber
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Re: Keep blowing ignition module. Will MSD box make this stop??

Good article on servicing and trouble-shooting the HEI.
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Old 09-30-2016, 12:47 AM   #8
Nickelcharlie
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Re: Keep blowing ignition module. Will MSD box make this stop??

A neighbor down the street was having this same issue and he gave up and sold his truck to a friend. His friend that bought it fixed it by spraying contact cleaner on the wires coming in from the ignition switch and all the contacts on the cap where these wires plug into (the little square box on the side of the distributor). He has not had any problems since.
Mine was doing the same thing and I sprayed Deoxit D5 contact cleaner on mine and I have not had any problems as of yet. If it happens again I have an older model distributor I think around 68-73 that I am going to switch out with the current distributor. The older models do not have any parts underneath the distributor thus eliminating pulling the distributor out to change out parts.
Also a mechanic recommended that I use nothing but DELCO parts. I put a new off brand module in mine and it would start and run but on the highway it would miss. Took us for ever to figure that out because most of the time when the module fails it will not start.
These trucks are getting older and electrical contacts are beginning fail becasue of corrosion.
I bought Deoxit D5 on line. It Improves Metal to Metal Connections and Contacts as advertised on the can.
I also bought a can CRC 2-26 contact Lubricant, makes the connectors slide together easier and helps keep moisture out, so I was told!
Hope this info helps some one!
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