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Unread 08-04-2012, 06:18 PM   #1
87manche17
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1987 MJ Comanche 
 
Join Date: Jul 2012
Location: Harlan, Kentucky
Posts: 168
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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Unread 08-06-2012, 07:32 AM   #2
cruiser54
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1990 MJ Comanche 
 
Join Date: Oct 2009
Location: Prescott, Arizona
Posts: 10,235
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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Unread 08-18-2012, 04:56 PM   #3
DonBC
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1989 MJ Comanche 
 
Join Date: Jan 2011
Location: Gabriola, British Columbia
Posts: 34
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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Unread 08-18-2012, 07:22 PM   #4
cruiser54
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1990 MJ Comanche 
 
Join Date: Oct 2009
Location: Prescott, Arizona
Posts: 10,235
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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Unread 03-26-2014, 08:46 PM   #5
vjsimone
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1988 FSJ Wagoneer 
 
Join Date: Jan 2011
Location: Lubuck, TX
Posts: 16
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.
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99 XJ Limited, 95 YJ, 93 ZJ Grand Wagoneer, 88 Grand Wagoneer,
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Last edited by vjsimone; 03-28-2014 at 08:30 AM.. Reason: Update on repair issue after reading post.
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Unread 04-03-2014, 10:28 PM   #6
cruiser54
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1990 MJ Comanche 
 
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Location: Prescott, Arizona
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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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Quote:
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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