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Old 07-23-2006, 01:50 PM
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ignition module

I have had two ignition modules go within 1,000 miles, what could be the cause or maybe change mfg? It's a MSD distributor. Joe

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Old 07-24-2006, 07:07 PM
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Doc here,

Several things can Kill a module..

First did you use generous amounts of heat sink compound? If not, that's your answer..

Heat is a prime factor of premature Module death.

High Voltage can kill a module..(bad Alternator , overcharging like 16 or higher volts)

Bad Rectifier Diodes Can kill a module , The Alternator will be putting out some amount of AC , or RAW voltage on the DC Source line, linear Op amps (modules) Can not (will not ) tolerate That very long.

Collapsing fields (like Fans) or alternator back feeds can cause failure AFTER the key is shut down, be sure the IGN wire is Isolated from the rest of the buss..and goes straight to the key. Usually you will get "Run on" with this , but not always.

BAD wires , or missfires..this often results in the 40 KV spark all dressed up and nowhere To go..and jumping around the dizzy, will often time dump on the module..

Check or replace your Wires, Have the Alternator Checked, be sure you use enough heat sink grease.

Don't rule out a Run of BAD modules..seen it happen before..try another supplier..

Doc
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Old 07-24-2006, 09:31 PM
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thanks

Thanks doc will check out the voltage from the alt. Gauge in car only reads only about 14 volts max. , but will check with gauge tomorrow. For some reason the engine has started to ping, never had a problem with pinging until now, thinking about discontenting the vacuum advance and see what happens. Joe
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Old 07-25-2006, 03:44 PM
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Doc here,

There may be a clue...

If it's pinging, It may be over advanced..

Causing more engine / Bay Compartment heat..

Burning up modules..

I assume you ARE using the compound with the modules??? Generously??

REMEMBER: the heat of the base of the dizzy IS NOT the heat of the water , or metal Block..But that which is transmitted THROUGH the oil pump..OR the heat of the oil (usually MUCH higher than the water) ... Since It drives the oil pump gear..and the direction of travel is UP..

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Old 07-25-2006, 05:46 PM
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I checked the voltage the alt. is putting out 14.4 volts at 2500 rpms. So I think I can eliminate the alt. putting out to much voltage. tomorrow I will disconnect the vacuum advance and go for a ride see what happens. Joe
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Old 07-26-2006, 01:00 PM
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Doc, disconnected the vacuum advance , ping is gone , don't know if the can is bad or just out of adjustment, don't know how adjustment could change. Any suggestions. Joe
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Old 07-26-2006, 05:44 PM
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Quote:
Originally Posted by jpelli
Doc, disconnected the vacuum advance , ping is gone , don't know if the can is bad or just out of adjustment, don't know how adjustment could change. Any suggestions. Joe
Doc here,

Check your mechanical advance weights, Then the Vacuum advance plate for free operation, (not stuck) , and proper weights for total timing..

A Good baseline for static and total timing is About 12 degrees static, (no vacuum advance , hose plugged) and About 34 , 36 .. Total advance..This will vary depending on your specific build..but good ballparks..

If it's running advanced all the time, It may be heating up the block, raising the temps at the module, blowing them out..They don't like much heat.

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Old 07-28-2006, 06:25 AM
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Thanks for all the help. Will check the timing today and eliminate that part of the puzzle.
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Old 08-03-2006, 07:40 PM
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convinced it's not the timing. check the dizzy everything is working fine. I may fatten up the carb. and see what happens. :
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Old 08-04-2006, 04:39 PM
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I found where the wires go thru the dist were chaffed. Right where they get pinched making the turn inside the dizzy. I was loosing modules and got occasional ruff running. Initial inspections did not show a problem. I pulled everything out so I could get a look at it. Saw the chafe on the wire. New dist harness cured it and smooth running came back.

Oh and what Doc said about the heat sink grease..... OUTSTANDING ADVICE.


Make sure and clean the old crud off with some non-flammable brake cleaner. You can clean the wires and general area too. Then put a nice coating of the grease that comes with the module on the shiny part of the module and install it. This is one place you cannot put too much grease.

Some actually have locating pins too. Make sure you seat the module down correctly and snug the screws.
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