Electrical Gremlins - JeepForum.com
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post #1 of 34 Old 05-15-2019, 03:32 AM Thread Starter
G3R0N1M0
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Electrical Gremlins

Hi guys 👋 new here on this forum working on a 1990 YJ tearing my hair out with electrical Gremlins I'm having an intermittent no start/stalling issue. cause no spark root of cause no idea distributor have been rebuild ie cap and rotor new coil new plugs and wires when there issue happens there is no spark coming from the coil where do I go from there any help won't be great thanks so much for

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post #2 of 34 Old 05-15-2019, 05:59 AM
Siva283
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Check your crank sensor. If its bad or no signal it will kill spark

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

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I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
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. It started with a $200 axle, and a few thousand dollars later I was done :)
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diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

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this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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post #3 of 34 Old 05-15-2019, 06:15 AM
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Check the Crank Position Sensor. the harness is extra long on some aftermarket replacements and it falls onto the exhaust. After it gets crunchy the intermittent problems begin.

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post #4 of 34 Old 05-15-2019, 11:45 AM
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It would be nice to know your Jeep info to give you good advice. Crank sensor or a bad coil.

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post #5 of 34 Old 05-15-2019, 09:00 PM Thread Starter
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Sorry your right it's a 4.2 carburetored
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post #6 of 34 Old 05-15-2019, 09:01 PM Thread Starter
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Also could a bad crank sensor cause intermittent no start/stall?
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post #7 of 34 Old 05-15-2019, 09:14 PM
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There's no crank sensor on the 4.2.

Bad Ignition Control Module, rid yourself of that and order a HEI distributor from CRT.

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post #8 of 34 Old 05-16-2019, 06:19 AM
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4.2 Carb'd. Has the Jeep been modifies and the nutter bypass done? Its a common mod that bypasses the emissions controls for the carb. Is it a stock carb?
So you're losing spark. The coil (ICM) and wiring is a common issue. Before you dump money into the ICM you need to answer the first 2 questions. If you have bypassed the vacuum nightmare then the answer is to get a HEI coil setup. The difference in reliability and better spark makes a work of difference and its much simpler.
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post #9 of 34 Old 05-16-2019, 01:54 PM Thread Starter
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4.2 Carb'd. Has the Jeep been modifies and the nutter bypass done? Its a common mod that bypasses the emissions controls for the carb. Is it a stock carb?
So you're losing spark. The coil (ICM) and wiring is a common issue. Before you dump money into the ICM you need to answer the first 2 questions. If you have bypassed the vacuum nightmare then the answer is to get a HEI coil setup. The difference in reliability and better spark makes a work of difference and its much simpler.
All stock no bypass part number on the hei that works?
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post #10 of 34 Old 05-16-2019, 09:45 PM
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http://lmgtfy.com/?q=crt+hei

https://crtperformance.com/shop?olsP...-232258-42l-i6

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post #11 of 34 Old 05-17-2019, 05:46 AM
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You really need to fill out your profile. Its hard to tell what you have on the rig and where you're at. Are you in an emissions compliant state. Will you have to smog your Jeep? If the answer is no then The nutter bypass can be ignored and you go to the MC2100 or the Weber 38 along with a HEI coil. These 2 things will bring your Jeep engine to life and eliminate so many of the issues that plague the early Jeeps. Together they are relatively inexpensive with a total under $500.00 for both you will be doing yourself a huge favor in the long run.

If you do need to meet compliance then you do the Nutter bypass. It will allow you to go back when you need to.

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post #12 of 34 Old 05-17-2019, 08:52 PM Thread Starter
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So thanks to all who have replied it was infact the ICM cause those issues but now I have a new issue that popped up while I was waiting for the part to come in all the gauges went out except the speedo and the clock (if I wiggle it a bit) I checked the fuse it was fine I currently have the gauges out so I can clean up the ribbon but I'm not even getting any signal to the connector any one have any ideas where to go from here?
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post #13 of 34 Old 05-17-2019, 08:59 PM Thread Starter
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Are you in an emissions compliant state. Will you have to smog your Jeep?
I'm in California and no smog on this Jeep it is a 1990 YJ w/ 4.2 i6 mated to a 5 speed 4x4 all stock no lift also it's not mine it's a family member who does not want to put it in the shop any more due to being screwed over to many times he wasn't interested in changing to hei or changing the carb so I gotta work with what I got also I did have to pull apart the carb today due to cruddy idle gonna clean out the lower end of it (idle mix) see if that helps any gosh this turned in to a long winded post 😂😂
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post #14 of 34 Old 05-17-2019, 09:09 PM
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Why do you have no smog on a '90 in CA? In an exempt county?

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post #15 of 34 Old 05-18-2019, 12:34 PM Thread Starter
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Why do you have no smog on a '90 in CA? In an exempt county?
Private ranch
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