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Unread 08-11-2012, 08:31 PM   #1
87manche17
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1987 MJ Comanche 
 
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ignition problem, out of ideas

I have a 87 MJ that just underwent a motor change, it started and ran fine with the old engine, now it will crank but wont kick over. Ive changed my CPS, coil, module. I really dont know what else it could be, could my distributor be bad? Or could it be something I havent thought of.

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Unread 08-11-2012, 08:38 PM   #2
BryceBrown
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What all have you done it can be a number of things the pigtail end of your crank position sensor could be the problem as well just like the sensor itself follow the basic steps first check make sure you get fuel once you know your getting fuel check to make sure if your getting spark start at the plug wire the d trick where you have your buddy crank it over and you have a screwdriver in the end of the plug wire and trace it that way all the way to your distributor if that doesnt work let me know it could be fuel pressure but mostlikley its ignition or check your ignition controll module
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Unread 08-11-2012, 08:47 PM   #3
87manche17
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its odd because im getting a good strong spark from my coil, but from the distributor cap its self I will get maybe one spark every once in a blue moon.I also checked the CPS its fine. So do I need a distributor?
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Unread 08-12-2012, 12:49 AM   #4
BryceBrown
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If you have replaced your distributor cap and rotor then yes if you have then yes its your distributor but also i know those rotars where they are placed is a horrble spot and get condensation in them and make the.points go bad but if its not that then yes you will need a distributor
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Unread 08-12-2012, 07:02 AM   #5
87manche17
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Ok thanks
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Unread 08-13-2012, 01:09 AM   #6
Rican142
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Im havin the same exact problem, try checking ur stator, its a 30 dollar part, its within the shaft of the distributor im not quite sure as how to check it though
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Unread 08-16-2012, 07:34 AM   #7
cruiser54
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Quote:
Originally Posted by Rican142 View Post
Im havin the same exact problem, try checking ur stator, its a 30 dollar part, its within the shaft of the distributor im not quite sure as how to check it though
Unfortunately, that $30 part has absolutely nothing to do with ignition and only helps time the injectors sequentially. A Renix will run with the stator unplugged.
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Unread 08-18-2012, 05:23 PM   #8
Rican142
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Oh ok
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Unread 08-18-2012, 10:41 PM   #9
87manche17
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Ive pretty much have an all new ignition system, but it still wants to keep up with the same problems. Would the entire distributor itslef cause it not to spark.
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Unread 08-19-2012, 06:54 AM   #10
cruiser54
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Quote:
Originally Posted by 87manche17 View Post
Ive pretty much have an all new ignition system, but it still wants to keep up with the same problems. Would the entire distributor itslef cause it not to spark.
If you have spark from the coil wire to the cap, all the distributor does is DISTRIBUTE the fire through the center of the cap, out the rotor, to the terminals inside the cap, and out the wires to the plugs.
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Unread 08-19-2012, 08:08 AM   #11
87manche17
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It doesnt fire at the plugs, but I know I've got voltage going into the distributor, which is really wierd.
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Unread 08-19-2012, 12:53 PM   #12
cruiser54
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Originally Posted by 87manche17 View Post
It doesnt fire at the plugs, but I know I've got voltage going into the distributor, which is really wierd.
Must be weak voltage if it can't jump from the tip of a rotor to a dizzy cap terminal.
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Unread 08-19-2012, 06:25 PM   #13
87manche17
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How would I fix that? Would the ECM have any thing to do with it? I have verified it is sending about 12 volts to the cap.
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Unread 08-19-2012, 07:00 PM   #14
cruiser54
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12? Where? The voltage to the center of the dizzy cap from the coil is in the tens of thousands of volts.
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