| [GMCnet] Re: How to test distributor modules [message #368172 is a reply to message #368171] |
Wed, 22 December 2021 21:18   |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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Sure will. Particularly if the screws that hold the coil inflate are even a
tiny bit loose. One of those 4 screws has a ground terminal under the head.
If loose, it will toast modules regularly. I fixed one at our last rally
for an owner that had failed 4 modules in about 2500 miles. Tightened those
screws and no more failures, yet.
Jim Hupy
Salem, Oregon
On Wed, Dec 22, 2021, 6:15 PM Ken Henderson wrote:
> Here's a pretty good procedure for an installed module, as well as the coil
> and pickup:
>
> https://www.jalopyjournal.com/forum/threads/is-there-a-way-to-test-an-hei-module.706237/
>
> And this leads to a more complete, complex and entertaining one:
> https://www.gmcmi.com/wp-content/uploads/2014/05/HEI-Testing.pdf
>
> Here's a pretty complete review of different HEI modules which will show
> you that the part store's use of a multimeter is essentially useless --
> module models vary widely in the resistances that are expected:
>
> http://gpzweb.s3-website-us-east-1.amazonaws.com/Ignition/HeiModules/HeiModules.html
>
> Frankly, I think testing modules alone is pretty much a waste of time,
> considering that they will sometimes allow the engine to start and run OK
> but later cause problems in performance. There are numerous Google
> articles about how to test one to determine whether missing spark is due to
> module failure -- those are valuable for getting the engine running but
> also cannot predict whether the engine will run well.
>
> One other comment: Any time you have module problems, check the coil and
> its connections -- the coil CAN and often does cause module failure.
>
> Ken H.
>
>
>
>
>
>
>
> On Wed, Dec 22, 2021 at 8:15 PM Bruce Hart wrote:
>
>> I took four modules to O'Reilly's to have them checked out. Only thing
>> they did was to check for resistance.
>> Is this really a good way to verify if the modules are any good.
>> --
>> Bruce Hart
>> 1976 Palm Beach
>> La Grange, Wyoming
>>
>> Genetically Modified Chevy
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