what would a bad ICM do?? - LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums

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Old 07-21-2009, 12:41 PM   #1
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Default what would a bad ICM do??

What are the symptoms if your ICM is going bad?
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Old 07-21-2009, 04:50 PM   #2
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No spark at all, missfires, etc.
Make sure it has a good ground and is cooled correctly
Autozone can test them, to a point.
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Old 07-21-2009, 05:09 PM   #3
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Here's a few symtoms,

-car just won't start.

-suddenly dies, usually after engine is hot and most of the time will not start for several hours. What happens is over time for being exposed to high heat from being mounted right to the head. You can try using some sort of spacers to get it further away from engine.
Or when it dies try putting a bag of ice on it for about 5mins or so, it the ICM is bad it should fire right up.
But how many people actually carry around a little bag of ice with them.

Just a couple of ideas to think of

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Originally Posted by steiger99 View Post
What are the symptoms if your ICM is going bad?
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CAI, Shorty Headers, 2.75" Y-Pipes, 3" Cat Delete Pipe, 3" Cat Back, UMI Strut Brace, 2000 Stall TC, Alum DS, 3.73's, Front Brake Upgrade, TTS Datamaster, TunerCat, Custom Tuned PCM By Me & Solomon!
283HP&305TQ RWHP, Before tuning
309HP&361TQ RWHP, After PCM Custom tuned
+20% pwr loss A4=370HP&433TQ(FWHP)
NOT BAD HUH?
IT'S ALL IN THE PCM TUNING!!!!1


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Old 07-21-2009, 06:26 PM   #4
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Stays out late,
Steals money from mom and dad,
Doesn't pay attention in school,
Starts hanging out with a new crowd, usually Mustangs.........JK

Check to make sure you have good voltage to the PCM before you condemm it, check connections.
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Old 07-21-2009, 09:52 PM   #5
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When its completely bad, your car will not start period. Well mine didnt, and I had to have to it flat bedded home but mine kinda died in a weird way.

Oh and only replace it with a GM one, no autozone specials.
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