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Old 08-23-2014, 11:59 AM   #1
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Engine cuts out randomly

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4.2L, AX15 trans, weber carb, removed cat. and pulse air system and installed glasspack. Carb was not nuttered by PO and i havn't done it because i go by "if it ain't broke dont fix it". It first happened yesterday once and today once. 60 mph taching about 2200, oil press. good, temp good, battery good, plenty of fuel, no noises or vibrations, out of nowhere engine just drops to 0 rpms, i roll to a stop, turn the key and it fires right up. What could be causing this? Im going to get a fuel filter now and see if that fixes it, if not im thinking its time for that nutter.

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Old 08-23-2014, 12:10 PM   #2
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Old 08-23-2014, 12:28 PM   #3
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Old 08-23-2014, 04:35 PM   #4
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Bueller? Bueller?
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Old 08-23-2014, 05:27 PM   #5
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A few things come to mind, fuel pump bad, fuel filter clogged, fuel line clogged or pinched, or ignition control module.
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Old 08-23-2014, 05:45 PM   #6
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The nutter takes care of the ICM, correct?
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Old 08-23-2014, 05:53 PM   #7
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Ill try the filter first but im not sure it will help cause if there was a fuel delivery problem there would be sputtering and long cranking, which there is not.
For the nutter i would take the orange and purple wires straight to the box under the washer fluid reservoir and adjust timing, correct?
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Old 08-23-2014, 07:32 PM   #8
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Quote:
Originally Posted by laredo View Post
The nutter takes care of the ICM, correct?
no, the nutter gets rid of the emmision control module. The icm controls the distrubutor and ignition. You can get a quality HEI distributor to remove the factory icm like crt performance and go for the great compact icm in the distributor

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Ill try the filter first but im not sure it will help cause if there was a fuel delivery problem there would be sputtering and long cranking, which there is not.
For the nutter i would take the orange and purple wires straight to the box under the washer fluid reservoir and adjust timing, correct?
It wouldn't exactly sputter with a carburetor. The pump is designed to surge at first start up to fill the caburetor fuel bowl when you first start your jeep. The fuel bowl will last a while then once it's drained it will cut out like you explained.
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Old 08-23-2014, 10:29 PM   #9
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Your jeep has the same basic ICM as the 70s Fords had and what you say is just what happens when they go bad, By doing the Nutter By Pass you no longer use the part that adjust the timing but still use the ICM for fire, I think you need to Change that Box under the washer jug. Just me!
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Old 08-23-2014, 10:35 PM   #10
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Oh if it ran out of gas and you let coast down with the engine turning the tack will show the RPMs, If the ICM stops working and you coast down with the motor turning the tack will read 0. look at it next time, Oh, and it will stop restarting at some point.
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Old 08-24-2014, 09:37 AM   #11
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Quote:
Originally Posted by Nubby55 View Post
Oh if it ran out of gas and you let coast down with the engine turning the tack will show the RPMs, If the ICM stops working and you coast down with the motor turning the tack will read 0. look at it next time, Oh, and it will stop restarting at some point.
Thats exactly what happens. It just drops to 0. So a nutter and new box under the washer jug should fix it? What is the box called btw?
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Old 08-24-2014, 09:54 AM   #12
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Just looked it up. The nutter bypasses the MCU and takes the wires straight to the ICM under the washer jug.
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Old 08-24-2014, 10:00 AM   #13
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$60 for a new one and it looks like you just plug it in and go. Any other suggestions?
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Old 08-24-2014, 01:19 PM   #14
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First thing I suggest is running a fuel pressure test. If that's fine, move to the nutter bypass. If that doesn't work, then move to changing icm. You can put in a better GM ICM: Civilian Jeep.Info "Stealth HEI" and forget the white wire if you do the above link.
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Old 08-24-2014, 01:55 PM   #15
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Quote:
Originally Posted by Nubby55 View Post
Your jeep has the same basic ICM as the 70s Fords had and what you say is just what happens when they go bad, By doing the Nutter By Pass you no longer use the part that adjust the timing but still use the ICM for fire, I think you need to Change that Box under the washer jug. Just me!
Which fords could i use an icm from? Rockauto has jeep icm's for $45, and fords are like $15 depending on year and model.
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Old 08-24-2014, 02:51 PM   #16
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Thanks for all the help. I did the fuel filter today and ordered a new icm. I'll let ya know how it works out.
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Old 08-24-2014, 06:52 PM   #17
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You would have to match it with a ford, where the wires come out of the box there is a plastic part, two of them, i think and the colors have to match .
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Old 08-24-2014, 07:22 PM   #18
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You would have to match it with a ford, where the wires come out of the box there is a plastic part, two of them, i think and the colors have to match .
Yea, i looked up a 78 f150 302 and it was identical except for the plug styles so i just ordered the factory replacement to avoid problems.
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Old 09-02-2014, 10:58 AM   #19
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UPDATE

I did a fuel filter, new ICM, and the nutter. Problem seems to be solved, thanks for the help.

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