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[GMCnet] Re: How to test distributor modules [message #368171 is a reply to message #368169] Wed, 22 December 2021 20:14 Go to previous messageGo to previous message
GMCWiperMan is currently offline  GMCWiperMan   United States
Messages: 1248
Registered: December 2007
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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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> GMCnet mailing list
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