GMCforum
For enthusiast of the Classic GMC Motorhome built from 1973 to 1978. A web-based mirror of the GMCnet mailing list.

Home » Public Forums » GMCnet » Modules/Coils
Modules/Coils [message #110467] Sat, 01 January 2011 08:08 Go to next message
Oldngray is currently offline  Oldngray   United States
Messages: 544
Registered: August 2009
Location: Punta Gorda Florida
Karma: 0
Senior Member
As mentioned in a earlier post, yesterday I had two Modules go South on me. The first was only six months old, the second was, I thought a good spare. (It was for about 10 minutes.)
Both Modules are Delco.
What I noticed when changing them was the Coil and BAT wire being very Hot.
Is this normal?


Richard MacDonald Punta Gorda, Florida Sold our TZE April 2015
Re: Modules/Coils [message #110468 is a reply to message #110467] Sat, 01 January 2011 08:16 Go to previous messageGo to next message
Hardie Johnson is currently offline  Hardie Johnson   United States
Messages: 483
Registered: January 2004
Location: Raleigh NC
Karma: 0
Senior Member
Oldngray wrote on Sat, 01 January 2011 09:08

As mentioned in a earlier post, yesterday I had two Modules go South on me. The first was only six months old, the second was, I thought a good spare. (It was for about 10 minutes.)
Both Modules are Delco.
What I noticed when changing them was the Coil and BAT wire being very Hot.
Is this normal?

That would seem to indicate the module failed in short mode, hmm. I would think it would fail open.


Hardie Johnson "Crashj"
1973 26 foot Glacier, White Thing
Raleigh NC
Re: Modules/Coils [message #110470 is a reply to message #110467] Sat, 01 January 2011 08:33 Go to previous messageGo to next message
mike miller   United States
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
Senior Member
Oldngray wrote on Sat, 01 January 2011 06:08

As mentioned in a earlier post, yesterday I had two Modules go South on me. The first was only six months old, the second was, I thought a good spare. (It was for about 10 minutes.)
Both Modules are Delco.
What I noticed when changing them was the Coil and BAT wire being very Hot.
Is this normal?


I am "new" to the HEI (my '73 doesn’t have one) but isn't there supposed to be thermal paste under that module?

My Audi has ignition modules with similar function... they burn up if you forget the paste. (I normally get the paste at a computer store... it is used between the CPU and CPU cooler/fans.)

I need to get a new module for my '78, keeping the one currently in the coach as a spare. Replacing a working module is a good way to ensure you have "known" good spare.


Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo' http://m000035.blogspot.com
Re: [GMCnet] Modules/Coils [message #110483 is a reply to message #110467] Sat, 01 January 2011 10:02 Go to previous messageGo to next message
Ken Henderson is currently offline  Ken Henderson   United States
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
Senior Member
Mac,

Those symptoms, added to the module failures, would sure make me
suspicious of the coil.

This provides a pretty good HEI test routine:
http://www.angelfire.com/realm2/84camaro/fix_the_car/coil/coil2.htm

Happy New Year to All!

Ken H.


On Sat, Jan 1, 2011 at 9:08 AM, Richard MacDonald <rm1936@gmail.com> wrote:
>
>
> As mentioned in a earlier post, yesterday I had two Modules go South on me.  The first was only six months old, the second was, I thought a good spare. (It was for about 10 minutes.)
> Both Modules are Delco.
> What I noticed when changing them was the Coil and BAT wire being very Hot.
> Is this normal?
> --
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist



Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
Re: Modules/Coils [message #110508 is a reply to message #110467] Sat, 01 January 2011 13:10 Go to previous message
Oldngray is currently offline  Oldngray   United States
Messages: 544
Registered: August 2009
Location: Punta Gorda Florida
Karma: 0
Senior Member
Hmmm, I changed Cap, Rotor and Module, Methinks that I will go back and do some testing, thanks much.
BTW, I did use paste.


Richard MacDonald Punta Gorda, Florida Sold our TZE April 2015

[Updated on: Sat, 01 January 2011 13:11]

Report message to a moderator

Previous Topic: Re: [GMCnet] Lathe Project
Next Topic: Air Fuel Ratio
Goto Forum:
  


Current Time: Sun Nov 17 00:43:53 CST 2024

Total time taken to generate the page: 0.00820 seconds