258 sudden engine shut down - JeepForum.com
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post #1 of 10 Old 08-20-2017, 07:09 PM Thread Starter
JeepdaddyRC
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258 sudden engine shut down

New to me 83 CJ with 258 and all OEM emissions - pulse air, computer, stepper motor - all there and operational (even passed smog). Engine idles and runs strong. Unfortunately, it has developed a sudden shut down. No stumble or stutter, just the smoothest engine cut off ever - like a switch was thrown. My first thougts are ignition control module, coil, or coil connection. Am I missing something related to engine temperature?

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post #2 of 10 Old 08-20-2017, 07:35 PM
stripperguy
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I once had a problem with an intermittent ignition switch. The actual switch, under the column/dash.

1977 CJ5 is a CJ build ever really done?
2002 TJ gone
2005 TJ also gone
2005 LJ insurance wreck
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post #3 of 10 Old 08-20-2017, 07:37 PM
StanV
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Your wiring could be starting to go and a short is causing you to loose spark, check to see if you have spark when it does not start.
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post #4 of 10 Old 08-20-2017, 07:51 PM
BagusJeep
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With the computer in the mix you have one more major component failure waiting to happen. You need the 1983 supplement to the FSM that details the test procedures for the CEC emissions system IF it electrical. The standard spark test at the plug will define if it is electrical, but the cause can be found only through systematic elimination.

It could also be a fuel supply which does not keep up leading to an empty fuel bowl, if you have a mechanical pump it will not refill the carb float bowl and filter whilst you are waiting, so if it restarts after a fair bit of churning on the starter it could be air in the fuel lines, getting in through cracked old hoses. Unlikely if it cuts cmpletely.

When it does stop, how do you get it restarted?

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1981 CJ7 258ci - Bagusjeep
1984 CJ7 258ci - Puthijeep
1981 J20 258ci - Gladys
1951 Willys CJ3A/MB/M38 - Little Willy
1995 Cherokee 4.0 - CHEROKEE
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post #5 of 10 Old 08-21-2017, 04:10 AM
Matt1981CJ7
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Yes, does it restart immediately, or is there a cool down period involved?

Also, check for goo leaking down the fender from under the ICM.

Matt
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post #6 of 10 Old 08-21-2017, 07:17 AM
LumpyGrits
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I would suspect that dang horseshoe connector on the coil also. Well known for issues you are see'n.
When it dies-Can you keep your hand on the coil or is it to hot??
LG

Have'n you along, is like loose'n 2 good men
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post #7 of 10 Old 08-21-2017, 07:30 AM Thread Starter
JeepdaddyRC
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Bagus, I thought it was a fuel supply issue. However, after it quits there is still a strong stream of fuel when I hit the throttle. I normally experience a stumble or sputter prior to stalling with poor fuel delivery.

This a sudden engine off condition and appears to be related to engine temp.

Matt, no restart until engine is cool. Next day it starts up again and runs fine. Choke is working as it should. After computer comes in the loop, I pull a vacuum hose to create a lean condition and can see the stepper pins move forward. Choke opens fully and is operational. However, after a few minutes at idle when engine warms (choke open, temp gauge into green) sudden shut down again.
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post #8 of 10 Old 08-21-2017, 04:04 PM Thread Starter
JeepdaddyRC
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Update to help others.

Unfortunately, I did not see Lumpy's post until now. In the meantime, I swaped in an OEM ICM. Problem not solved. Even stalled when cold. Fixed up the loose, dirty and corroded coil horseshoe connection. I think we got it!

Here is a quote for JeepHammer I found too late:

BAD COIL CONNECTOR is a VERY COMMON PROBLEM, and the cause of that mystery 'No Start' or mystery 'Shut Off' problem so many people experience,
BUT,
Since it's an INTERMITTENT problem, it's VERY hard to trace!
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post #9 of 10 Old 08-22-2017, 02:15 AM
BagusJeep
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Doing it when hot also points to an internal coil break. When it heats up the wires expand and they disconnect, cool down and it reconnects.

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1981 CJ7 258ci - Bagusjeep
1984 CJ7 258ci - Puthijeep
1981 J20 258ci - Gladys
1951 Willys CJ3A/MB/M38 - Little Willy
1995 Cherokee 4.0 - CHEROKEE
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post #10 of 10 Old 08-24-2017, 07:19 AM Thread Starter
JeepdaddyRC
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Update #2. Problem continued after repairing coil horseshoe. Just swapped in an OEM coil. Will update. Chasing this mystery shut off has been a challenge.
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