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| ignition control module problems https://slantsix.org/forum/viewtopic.php?t=64280 |
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| Author: | mopardean [ Thu Dec 05, 2019 12:19 pm ] |
| Post subject: | ignition control module problems |
Some years back i retrofitted my 87 half ton originally equipped with the POS lean burn with the Chrysler electronic ignition complete with ballast resister and ICM from a mid 70's slant six duster. The ICM was failing routinely and continually....when trying to start it, often in traffic... when i was stopped at a red light stalling out when releasing the clutch, etc. Over the years i was continually replacing the ICM's and attributed it to poor quality foreign parts. Sooooo..... this past summer i finally got off my duff and installed the GM HEI per Dan's instructions and it ran terrific. The change was dramatic but unfortunately it soon began to burn out the HEI modules as well. This time it will often shut down when running....in traffic....all the time with out warning every bit as bad before the conversion. I believe i must have some sort of voltage surge but i am not sure. Has anyone experienced anything like this? I sure would like to make this vehicle reliable. All thoughts and ideas would be sincerely appreciated. Dean |
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| Author: | DadTruck [ Thu Dec 05, 2019 1:00 pm ] |
| Post subject: | Re: ignition control module problems |
1) install a genuine AC Delco 4 pin HEI module here is one available from RockAuto https://www.rockauto.com/en/moreinfo.ph ... SVLYCdg%3D or maybe get one from a Chevy at a Pull a Part. I had two Mallory HEI modules fail each in less than 18 months is use 2) be sure that you have a heat sink and that you are using a heat transfer paste between the back side of the HEI and the heat sink one heat sink example is at the link below https://www.summitracing.com/parts/ado- ... gLXDfD_BwE the heat sink paste should be in the box with the new moudle 3) although others have not I run mine through a dedicated relay to get solid voltage to the module. The HEI module ground is also important. Run the power wire to the relay directly to the battery ( fuse it) and you will solid voltage and minimize power surge concerns. |
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| Author: | SlantSixDan [ Thu Dec 05, 2019 2:53 pm ] |
| Post subject: | Re: ignition control module problems |
You'll want to check your charging system to make sure the alternator's output is steady and smooth, not flickery and spiky. |
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| Author: | mopardean [ Fri Dec 06, 2019 11:44 am ] |
| Post subject: | Re: ignition control module problems |
thank you both very much i will work on implementing your suggestions / solutions any other comments / suggestions are always welcome thanks again dean |
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| Author: | Joshie225 [ Fri Dec 06, 2019 11:24 pm ] |
| Post subject: | Re: ignition control module problems |
DadTruck covered most of it. Go through all the battery charging, alternator and regulator wiring and connectors. This includes the ammeter connections, the bulkhead connector and all the junk at the starter relay. Make sure the engine block and chassis are well bonded (connected electrically) using the same size cable as the negative battery cable. |
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| Author: | mopardean [ Mon Dec 16, 2019 11:26 am ] |
| Post subject: | Re: ignition control module problems |
thank you Josh i will do this also |
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| Author: | Greg Ondayko [ Wed Dec 18, 2019 7:23 am ] |
| Post subject: | Re: ignition control module problems |
I have had similar problems... on my 318's with HEI Retrofit. I was using Standard brand HEI Modules.. I guess I need to buy some relays, AC Delco modules and Wire it correctly. Greg |
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| Author: | mopardean [ Thu Dec 19, 2019 7:45 am ] |
| Post subject: | Re: ignition control module problems |
thanks Greg |
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| Author: | Reed [ Thu Dec 19, 2019 10:28 am ] |
| Post subject: | Re: ignition control module problems |
The decline in quality of the HEI modules makes me think going to Ford's EDIS is a preferred way to go. Parts are newer, at least. |
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| Author: | coconuteater64 [ Thu Dec 19, 2019 12:55 pm ] |
| Post subject: | Re: ignition control module problems |
Quote: The decline in quality of the HEI modules makes me think going to Ford's EDIS is a preferred way to go. Parts are newer, at least.
That's why I searched for a genuine HEI module from GM. It was NOS for a Firebird IIRC, but I am pretty sure al lthe GM modules are identical. I run mine with a dedicated relay too so I can install a hidden "no start" switch.
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| Author: | slantzilla [ Thu Dec 19, 2019 1:18 pm ] |
| Post subject: | Re: ignition control module problems |
Is it really buring up modules or are you losing power to it? It seems odd to me that it is burning up modules even after changing style of ignition. Where is power being fed from? |
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