95 ICM to 96 ICM - CamaroZ28.Com Message Board


LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

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Old 09-07-2009, 12:41 PM   #1  
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95 ICM to 96 ICM

Are they the same ICM or are they different since one is OBDI and one is OBDII?? Will the 95 ICM start the 96 OBDII Car??

The reason I,m asking is that my car wont start, I have two car, one is a parts car fixer uper with an OBDI. The ICM on the 96 test BAD. The on the 95 test good. However the 95 ICM wont start the car and I,m running out of options as a new ICM cost $60 and I dont have it at the moment.
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Old 09-07-2009, 02:17 PM   #2  
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Other people have swapped ICMs from year to year without any seeming trouble (although they are difffernt part numbers). The OBD thing should not be of any consequence, though.
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Old 09-07-2009, 02:49 PM   #3  
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Is there a page somewhere that you have SHOEBOX that tells what omhs or volts your to have off of curtain plugs to get fire??? Like the Opti wire, what are you suppose to have there and at the COIL plug and ICM plug?? We used a tester and got readings but not sure what and how high there suppose to be.

basically I have no spark, Ive swapped with a coil that I KNOW works and still nothing, swapped with another ICM, tested both ICMs and they test good still nothing. I redid the three ground wires to make sure that was a good connection still nothing. Just turns over, no spark to the coil.

Help!!!

Last edited by Venomous360; 09-07-2009 at 03:01 PM.
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Old 09-07-2009, 03:47 PM   #4  
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Old 09-07-2009, 03:49 PM   #5  
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Thanks for that I,ll save that info. We figured it out, the opti went bad. I had another one off the other car, unglugged my opti wire plugged it into the one I had I canked while my friend spun the rotor with his hand and it fired, the faster he spun the higher the motor went. Tell me you didnt know you could do that??

lOL you learn something new everyday.
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Old 09-07-2009, 08:32 PM   #6  
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Quote:
Originally Posted by Venomous360 View Post

Thanks for that I,ll save that info. We figured it out, the opti went bad. I had another one off the other car, unglugged my opti wire plugged it into the one I had I canked while my friend spun the rotor with his hand and it fired, the faster he spun the higher the motor went. Tell me you didnt know you could do that??

lOL you learn something new everyday.
Sorry, I knew you could spin the opti and it fire the plugs and injectors. But...I have not known anyone to actually start their engine that way! That's kinda cool.
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Old 09-08-2009, 09:33 PM   #7  
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Before I say what I have to say, I want to get something straight. What you're saying is by using another opti not bolted to the engine in a persons hand electrically connected to the engine however. Someone managed to turn it at exactly the correct rotational speed to have the engine not only run but actually speed up as well ? Do I have that correct?????

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Old 09-12-2009, 06:27 AM   #8  
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Please answer the last question asked.
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Old 10-03-2009, 12:41 PM   #9  
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Yes sorry its been so long.

Yes that is what we did. The car would not fire, we swapped the coil and ICM adn had BOTH tested to make sure they worked. So we induced that the OPTI must be what the problem is. I didnt want to take it apart to find out so we came up with that Idea. We unglugged the OPTI harness and plugged it into a good Opti that my bud was holding, while I cranked the car over he spun the cam shaft on the back of the opti and the damn car started but it was ruff, so he sped of the spin and it ran better, if he spun it slow it would be around 200 RPM and he could spin it fast enough to get 700 to 1000 RPM out of it. LOL I didnt think it would work either.

Last edited by Venomous360; 12-05-2009 at 03:02 PM.
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Old 10-03-2009, 03:24 PM   #10  
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I would love to see a video of that.
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Old 10-04-2009, 06:52 AM   #11  
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So the plug wires were plugged into the opti that was bolted to the engine. But the one in your friends hand only had the 4 wire feedback harness plugged into it, not the plug wires. Is that correct?
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Old 10-09-2009, 09:00 PM   #12  
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Originally Posted by speedygonzales View Post
So the plug wires were plugged into the opti that was bolted to the engine. But the one in your friends hand only had the 4 wire feedback harness plugged into it, not the plug wires. Is that correct?
YES.

I would get a vid and do it again if I had another OPTI but alas I dont as the only good one I have now is the one ON The CAR.

Last edited by Venomous360; 12-05-2009 at 03:01 PM.
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Old 12-03-2009, 10:00 AM   #13  
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WOW! You learn something everyday on this board. Another way to test for a failed Opti.
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Old 12-03-2009, 01:40 PM   #14  
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I am just curious as to how the plug wires were firing? If the plug wires were connected to the old opti...ok ok, I get it now the firing mechanism in the OLD opti was good still...but how was the computer telling it to fire the plugs if there was no feedback between IT and the computer? Because the 4 wire was pluged into the NEW opti...man I am confused!

Please clarify!

Thanks, Charlie
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Old 12-05-2009, 03:01 PM   #15  
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I dont really know how it worked, if you have a Opti to try it with its easy and you would understand a little more how it worked. I for one didnt think it would work when we were going to try it but we were running out of options.

Shoebox, may be able to shed some light on how this May have worked, I just know it did.
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