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  Could a Bad Distributor cap cause an ICM failure ?

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Could a Bad Distributor cap cause an ICM failure ? by StockGT
Started on: 02-04-2014 03:06 PM
Replies: 4 (292 views)
Last post by: StockGT on 02-06-2014 09:17 PM
StockGT
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Report this Post02-04-2014 03:06 PM Click Here to See the Profile for StockGTClick Here to Email StockGTSend a Private Message to StockGTEdit/Delete MessageReply w/QuoteDirect Link to This Post
I went to drive my GT yesterday and it would not start, engine cranks OK. Could hear the fuel pump priming.

No Tach movement off zero RPMs, looking like an Ignition problem.
Testing ignition components with a Ohm meter, I found that the distributor cap had a high resistance reading between the center coil terminal on top of the cap, to the spring button under the cap. The meter had a reading of 10.0 Meg ohms.
What should the resistance measurement be on a good Dist. cap for the center terminal ?

Replacing the Ignition module and Dist. cap got it running again!
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Gall757
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Report this Post02-04-2014 04:44 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
High resistance in the high voltage side of the ignition can kill an ICM. Usually it's bad spark plug wires, but I guess a bad cap could do it too.
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conan469
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Report this Post02-04-2014 04:47 PM Click Here to See the Profile for conan469Click Here to visit conan469's HomePageClick Here to Email conan469Send a Private Message to conan469Edit/Delete MessageReply w/QuoteDirect Link to This Post
high resistance in wires/plugs causes spark to seek out an easier path.
i have seen it several times when the spark burns down through the rotor back into the distributor and killed the icm.
replace cap and rotor with icm or whole dist.
avoid Cardone parts.
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theogre
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Report this Post02-05-2014 11:39 AM Click Here to See the Profile for theogreClick Here to visit theogre's HomePageSend a Private Message to theogreEdit/Delete MessageReply w/QuoteDirect Link to This Post
Allot of thing can kill ICM.
Some are here...
See my Cave, HE Ignition

------------------
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 (It's also at the top and bottom of every forum page...)

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StockGT
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Report this Post02-06-2014 09:17 PM Click Here to See the Profile for StockGTClick Here to Email StockGTSend a Private Message to StockGTEdit/Delete MessageReply w/QuoteDirect Link to This Post
I went ahead and ordered a new cap and rotor, used the old cap to get the car running. Will replace the Spark plug wires too.
The rotor had a dusting of fine black power, which was cleaned off.

Thanks for the replies, Great info on your web page Ogre.
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