LT1-LT4 Modifications 1993-97 Gen II Small Block V8

code 43. icm problem, cant figure out

Old Aug 21, 2011 | 06:15 PM
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Default code 43. icm problem, cant figure out

i had an icm go bad. i did the washer, cooling mod. had another one go bad. zip tied the icm to the abs block. had another one go bad. bolted the heat sink back on and re zip tied to the abs block. now, another has gone bad. can anyone figure this out?
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Old Aug 21, 2011 | 06:22 PM
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Are you using heat sink paste? Are you using your years specific icm part #'s?
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Old Aug 21, 2011 | 06:24 PM
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not all but most are the same year. i had a few spares laying around at work
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Old Aug 21, 2011 | 07:44 PM
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Code 43 is a knock sensor problem.
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Old Aug 21, 2011 | 08:28 PM
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Should be easy to figure out. What coil are you using? Any other mods to the ignition circuit? Are you sure it's an ICM problem?

Al 95 Z28
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Old Aug 21, 2011 | 08:49 PM
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the description is esc circuit. i thought that included the icm. the knock sensor a few weeks old, acdelco.

im using an msd coil. the pigtails to the coil and icm are all new
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Old Aug 21, 2011 | 08:51 PM
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I thought a 43 was a knock sensor code as well. I ohm it and make sure its with in spec.
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Old Aug 22, 2011 | 01:07 AM
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Originally Posted by ElkySS

im using an msd coil. the pigtails to the coil and icm are all new
What MSD coil? What's the part number? Or a link to it.

Al 95 Z28 w/ MSD 6AL
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Old Aug 22, 2011 | 07:49 AM
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42 is ICM
43 is knock sensor. make sure your exhaust didn't burn through the wiring.
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Old Aug 22, 2011 | 08:12 AM
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43 has nothing to do with the ICM. If you have been changing your ICM just because of this code, you are wasting a lot of money.
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Old Aug 22, 2011 | 11:32 AM
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the car kept cutting out at high rpm and dieing in traffic. i had a spare with me and the car ran. had this happen a few times. i just now got this code. car still runs fine tho. ill check my knock sensor wiring
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