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| Can an ICM still work even though its bad (Page 1/2) |
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Markeeise
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MAY 12, 04:05 PM
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What I heard is if the ICM is bad then it won't work at all and there will be no spark. But can it still be bad or defective and still work?
Thanks
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Gall757
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MAY 12, 06:46 PM
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ICMs fail in lots of different ways. Many times it is only when they are hot...or they don't send a signal to the injectors....or intermittent with a back fire...
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Markeeise
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MAY 12, 06:51 PM
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| quote | Originally posted by Gall757:
ICMs fail in lots of different ways. Many times it is only when they are hot...or they don't send a signal to the injectors....or intermittent with a back fire... |
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OK, thanks for the help.
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Dennis LaGrua
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MAY 12, 07:49 PM
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I've replaced ECM's where the car stumbled badly upon initial throttle application /acceleration. Replaced and was good. If its a PCM it should set a trouble code. ECM's / PCM's can work if defective but will give poor performance. Occasionally they burn out altogether. ------------------
" 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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theogre
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MAY 12, 11:38 PM
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HEI ICM uses just 1 mounting screw as Ground.
If or more likely when that screw is dirty etc or has "Black Oxide" or paint will cause ICM problems or even kill ICM repeatedly.
See my Cave, HE Ignition and Ground "Myth" notes
------------------
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)
The Ogre's Fiero Cave
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Markeeise
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MAY 14, 02:21 AM
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| quote | Originally posted by Gall757:
ICMs fail in lots of different ways. Many times it is only when they are hot...or they don't send a signal to the injectors....or intermittent with a back fire... |
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okay thanks for letting me know, I have issues when my car gets warm and idle hunts around.
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Markeeise
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MAY 14, 02:23 AM
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| quote | Originally posted by theogre:
HEI ICM uses just 1 mounting screw as Ground.
If or more likely when that screw is dirty etc or has "Black Oxide" or paint will cause ICM problems or even kill ICM repeatedly.
See my Cave, HE Ignition and Ground "Myth" notes
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should I put thermal paste between the ICM and the mounting plate? or will ground connection be weak, thanks
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Markeeise
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MAY 14, 02:24 AM
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| quote | Originally posted by Dennis LaGrua:
I've replaced ECM's where the car stumbled badly upon initial throttle application /acceleration. Replaced and was good. If its a PCM it should set a trouble code. ECM's / PCM's can work if defective but will give poor performance. Occasionally they burn out altogether.
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mmm, ok if it were throwing codes would the check engine light be on? Thanks
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Patrick
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MAY 14, 04:18 AM
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| quote | Originally posted by Markeeise:
should I put thermal paste between the ICM and the mounting plate? or will ground connection be weak?
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Thermal paste is supposed to be there already. If in doubt, it certainly wouldn't hurt to re-apply it.
The ground connection is through the two mounting screws, not through the base of the ICM.
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Patrick
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MAY 14, 04:22 AM
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| quote | Originally posted by Dennis LaGrua:
ECM's / PCM's can work if defective but will give poor performance. Occasionally they burn out altogether.
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Dennis, the OP is asking about an ICM.
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