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post #1 of 9 Old 09-12-2017, 09:48 AM Thread Starter
brentd711
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1990 YJ Wrangler 
 
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Random shutdown

I thought my '93 had a bad connector on the crank sensor wire that caused it to shut down randomly but now I'm not so sure. Used to wiggle the connection and it would start right up but yesterday I just had to cycle the ignition and it restarted. Shut down three times yesterday within three miles, then ran fine for the last four miles home.

Any thoughts on what could be going on?

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post #2 of 9 Old 09-12-2017, 10:10 AM
Jeepsr4me
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How about fix the short in the wire that you kinda suspect is the problem? Strip the harness back from it and follow the wires to a termination point.. You will see a fray or break or inside the connector there is corrosion
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post #3 of 9 Old 09-12-2017, 01:28 PM
mike134
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I'd clean and grease the connector as a first step. Then if that doesn't help, do as Jeepsr4me suggests.
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post #4 of 9 Old 09-12-2017, 01:46 PM Thread Starter
brentd711
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The connector looks good and I've been using lithium grease that I thought was helping. Separating the wires from the harness looks like a tough job so I guess I'll check out the FSM to find the termination connections first.
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post #5 of 9 Old 09-12-2017, 02:02 PM
Jeepsr4me
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Start by getting that grease out of the connector... Unless you saw the connections where nice and clean and brass colored then you could have issue there..
I use brake clean to clear it.. Then since you say wiggling the wire works then the issue is within that area.. termination point is just a place you can follow back to.... Not start.
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post #6 of 9 Old 09-12-2017, 02:36 PM Thread Starter
brentd711
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1990 YJ Wrangler 
 
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Yeah but I needed an idea of where the CPS terminates. Looks pretty simple, two wires to the PCM and a ground. Ground seems the most likely culprit.
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post #7 of 9 Old 09-13-2017, 10:57 AM
mike134
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Ugh, my post was deleted because I lost internet for a second. I like the actual electronics cleaners rather than the carb cleaners, but I also use it on integrated circuits and circuit boards. Carb cleaner may be ok for your application as suggested above.

Summary: Use dielectric grease, not lithium grease. Either buy a copule tiny tiny condom packets of it next to the cash register at Autozone, or buy the big hulking bottle of it. The small bottles are way over priced.


The little packets are about a buck a piece. Its not a bad idea to buy one of every type. For $10 bucks you suddenly have a really good remote break down grease kit for every occasion.

The terminals at the ECU connector related to CPS will be labeled in the factory service manual. You can probe the two ends to look for continuity of the entire wiring harness.
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post #8 of 9 Old Yesterday, 05:49 PM Thread Starter
brentd711
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1990 YJ Wrangler 
 
Join Date: Aug 2010
Location: Maine
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Cleaned all the grease out of the connector and it has gotten me to work and back for two days without shutting down.

Keeping the tow bar in the back for a while but it's looking promising.
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post #9 of 9 Old Yesterday, 10:26 PM
mike134
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Great! Hopefully that's the problem. Don't forget to pack it with the correct dielectric grease again for water proofing.
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