ignition module causing spark issue - JeepForum.com

 
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post #1 of 6 Old 08-04-2012, 05:18 PM Thread Starter
87manche17
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ignition module causing spark issue

My 87 Comanche is having a issue with the ignition the motor will crank, but I have no spark. Ive already replaced my CPS, Distributor, wires, coil pack, plugs. I have also checked my grounds, I think my ignition module, witch sits under the coil pack, is shot. am I right or could it be something I haven't thought of, I would really appreciate any help.

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post #2 of 6 Old 08-06-2012, 06:32 AM
cruiser54
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Try this then:

Renix Jeep ICU/Coil contact refreshing



The contacts between the coil and the ICU on your Renix Jeep can become corroded and loose causing a complete or intermittent no-start condition. I recommend the following procedure as a maintenance precaution to insure this is eliminated as a possible cause now and in the future.

The coil is attached to the ICU by two T20 Torx bolts. Remove these two bolts and lift the coil up off the ICU. You will see 2 pins and 2 sets of contacts. Clean both the pins and springy contact pieces with a good electronics cleaner.
Squeeze the springy contacts closer together with some needlenose pliers. Apply some dielectric grease to the contacts and bolt the coil back on to the ICU.
While you’re right there unplug the connectors from the ICU and inspect the pins in the harness connector. Make sure the pins are not retracted into the connector. Spray out the connector and the receptacle of the ICU with the same good electronics cleaner you used earlier. Apply dielectric grease to the connectors and plug them back in.

I feel this procedure should be performed at least once in the lifetime of a Renix Jeep.


Revised 11-29-2011
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post #3 of 6 Old 08-18-2012, 03:56 PM
DonBC
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I would try the cleaning process as mentioned. I had the same problem about 3 months ago and after following test routines on the components that could affect spark I came to the conclusion that it probably was the ICM. They are a little pricey and I was reluctant to spend the money if that wasn't the problem so I picked one up at a salvage yard and that solved the problem.
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post #4 of 6 Old 08-18-2012, 06:22 PM
cruiser54
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Quote:
Originally Posted by DonBC View Post
I would try the cleaning process as mentioned. I had the same problem about 3 months ago and after following test routines on the components that could affect spark I came to the conclusion that it probably was the ICM. They are a little pricey and I was reluctant to spend the money if that wasn't the problem so I picked one up at a salvage yard and that solved the problem.
R*C*B*R*C = Refresh* Connections*Before*Replacing*Components
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post #5 of 6 Old 03-26-2014, 07:46 PM
vjsimone
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Comanche - No Spark

OK 87manche17 - What happened??


Thanks Cruiser54 for your post, my 88 MJ, IL6 had a no spark situation. MJ sat up a few months. Cleaned the connectors under the coil, and she started right up.

Vincent

99 XJ Limited, 95 YJ, 93 ZJ Grand Wagoneer, 88 Grand Wagoneer,
88 MJ Comanche, 61 Willys Wagon

Last edited by vjsimone; 03-28-2014 at 07:30 AM. Reason: Update on repair issue after reading post.
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post #6 of 6 Old 04-03-2014, 09:28 PM
cruiser54
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Quote:
Originally Posted by vjsimone View Post
OK 87manche17 - What happened??


Thanks Cruiser54 for your post, my 88 MJ, IL6 had a no spark situation. MJ sat up a few months. Cleaned the connectors under the coil, and she started right up.
Woohoo!!

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