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| Stumbling upon Acceleration (wierd symptoms) 3800SC (Page 2/2) |
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RotrexFiero
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OCT 13, 12:53 PM
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I'm seeing the ignition module for around $50.....knowing what I know about electronics is "when they go, they go", and these were probably the original coil packs. So, it would be good to swap in a new one.
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Dennis LaGrua
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OCT 13, 10:27 PM
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| quote | Originally posted by RotrexFiero:
I'm seeing the ignition module for around $50.....knowing what I know about electronics is "when they go, they go", and these were probably the original coil packs. So, it would be good to swap in a new one.
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Thats a good assessment. The ICM's that I've used have gone for over $100. What brand do you find for $50? Like everything else quality of the different ICM's is probably varied. Have used AC Delco but they are priced high.
UPDATE: In consulting with a friend that has a large repair shop he advised that the ignition modules below the coil pack can partially go out. He has seen this a few times. This can happen because there are three drivers on the ICM board (one per coil) and if one goes out you'll have a misfire on just a couple of cylinders.
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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE " [This message has been edited by Dennis LaGrua (edited 10-20-2025).]
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RotrexFiero
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OCT 14, 04:58 PM
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Yeah, the price of the ECMs varies, so yes it makes you wonder about quality, but I have seen them on ebay from $50 up over $100.....but from what I am reading the reviews are all similar in terms of life expectancy.
It makes me wonder if they are applying the silicon grease to aid with heat dissipation. I hear that is important.
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Dennis LaGrua
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OCT 14, 10:21 PM
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| quote | Originally posted by RotrexFiero:
Yeah, the price of the ECMs varies, so yes it makes you wonder about quality, but I have seen them on ebay from $50 up over $100.....but from what I am reading the reviews are all similar in terms of life expectancy.
It makes me wonder if they are applying the silicon grease to aid with heat dissipation. I hear that is important.
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Unlike the small ignition module used on the Fiero, I read nothing in the GM manual that says thermal grease under the 3800 Coilpack/ICM is necessary. The module is mounted to a big plate and mounted to the coils so there appears to be a wide direct contact area on the ICM for heat dissipation . Haven't used thermal grease and haven't had any issues. If you read different let us know.
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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "
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