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scottb

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Icm
« on: July 30, 2017, 12:29:23 PM »
This weeks newest issue is an intermittent cut off. Driving along the engine shuts off. Push in the clutch, hit the key it starts right back up. I tried doing a rolling start last week and got an awful backfire. Sounded like a canon going off. Since there is no rhyme or reason to it I am leaning toward the icm going out. My question is which one? Rock auto lists 2 different ac delco icms for the Fiero V6. What is the group's suggestion?
Thanks, Scott

GTRS Fiero

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Re: Icm
« Reply #1 on: July 30, 2017, 01:15:58 PM »
Rolling start, as in starting it by popping the clutch?

Replacing the ICM is a good idea--IF you can get a good one.  I'd buy locally, just for that reason.  Take yours in, have the local auto parts store test, and buy 2 new ICMs.  Have them test both BEFORE YOU LEAVE THE STORE, just to have the best chance of getting a good one.

Test both new ICMs on your Fiero.  Once both are verified good, put one in your Fiero tool bag and keep it in your Fiero.

While you're in there, check and clean the contacts, and make sure to use the paste for the ICM.  I usually replace the coil and that connector between the coil and ICM.

Fierofool

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Re: Icm
« Reply #2 on: July 30, 2017, 03:10:15 PM »
You will probably get a better part if you go to NAPA.  They sell Standard Ignition, Echlin, Delphi, NAPA and some other brands.  You may pay a little more for it, but you can also look on the box to see where they're made.  Mexico or Canada are my preferences over other countries if not US Made. 

Ignition modules usually don't recover that quickly.  I would suspect an ignition coil or pickup coil. 
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f85gtron

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Re: Icm
« Reply #3 on: July 30, 2017, 03:37:26 PM »
Ditto on the ignition coil
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scottb

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Re: Icm
« Reply #4 on: July 30, 2017, 04:21:41 PM »
Ok, i will swap out the coil, as I have a spare....... easier to change too. Thanks yall

TopNotch

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Re: Icm
« Reply #5 on: July 30, 2017, 06:12:55 PM »
Before you replace anything, try removing the connectors from the ICM and the coil, and replace them. This will wipe the contacts. Oxidation on the contacts can cause problems.
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Roger

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Re: Icm
« Reply #6 on: July 30, 2017, 07:31:38 PM »
Also make certain that all 4 wires that plug into the ICM are locked in the connector and do not push out when you install the connector to the ICM.
Been there, seen it, taken many aspirins.
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f85gtron

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Re: Icm
« Reply #7 on: July 30, 2017, 08:12:04 PM »
I meant pickup coil. But test both, just to be on the safe side.
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scottb

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Re: Icm
« Reply #8 on: July 30, 2017, 08:18:23 PM »
Also make certain that all 4 wires that plug into the ICM are locked in the connector and do not push out when you install the connector to the ICM.
Been there, seen it, taken many aspirins.

The way I feel right now its going to take more than aspirin

Roger

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Re: Icm
« Reply #9 on: August 01, 2017, 03:40:22 PM »
I meant pickup coil. But test both, just to be on the safe side.
I believe it was Cowspatoot who had a problem on a RFTH and I checked his pickup coil. It ohm'ed out good but in the end it was the culprit. Heat likely played the part here.
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