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post #1 of 11 Old 05-04-2021, 11:02 AM Thread Starter
AWJ
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Whip lash

1992 sahara manual has been driving great but all of a sudden has developed the cut out cut on condition while driving i pull over and the rpms bounce from around 6-just under 1k if i let it cool off it will run flawlessly until its up to temp usually 4 mins i can crank it at home and it will set there and idle i rev it up to about 2k every few mins and no problem it only cuts off and on while driving any thoughts or suggestions ?

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post #2 of 11 Old 05-04-2021, 11:54 AM
Boojo35
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I am not one to throw parts at a vehicle but....... replace the crank sensor.

If you cannot fix it with a hammer then it has to be an electrical problem.
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post #3 of 11 Old 05-04-2021, 12:09 PM Thread Starter
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The one in there is from napa and reads no resistance but thats not to say its not failing when up to temp what is the recomended one and where is the place to get it? Thanks
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post #4 of 11 Old 05-04-2021, 12:44 PM
Boojo35
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IIRC they are a hall effect switch which has a transistor. There is more to them than a resistance test. Honestly, NAPA stuff is usually decent for aftermarket type stuff but they do have different grades like NAPA performer to NAPA Echlin.

How new is your NAPA sensor that you do not want to condemn it?

It could be ASD or crappy wiring related, tired fuel pump, etc. but your symptom sounds like a crank sensor more often than not.

If you cannot fix it with a hammer then it has to be an electrical problem.
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post #5 of 11 Old 05-04-2021, 04:49 PM Thread Starter
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It is a napa proformer and its about 3 months old the jeep itself was bought new by my dad and has never been off the road its been garage kept and is in great condition not to say that some wires and terminals may have corosion on them
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post #6 of 11 Old 05-04-2021, 04:52 PM
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Quote:
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It is a napa proformer and its about 3 months old the jeep itself was bought new by my dad and has never been off the road its been garage kept and is in great condition not to say that some wires and terminals may have corosion on them
So the Napa part may have a warranty on it.

If you cannot fix it with a hammer then it has to be an electrical problem.
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post #7 of 11 Old 05-05-2021, 05:39 AM Thread Starter
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I will take the old one in when i go get a new one today
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post #8 of 11 Old 05-05-2021, 09:09 AM Thread Starter
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So when i went to take the old one off the bolts weren't tight i could turn them with my fingers kids must have come outside during the last install and got me side tracked didn't have time to test drive but i tightened it up and it cranked faster than ever hope that was the problem
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post #9 of 11 Old 05-05-2021, 10:01 AM
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Quote:
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So when i went to take the old one off the bolts weren't tight i could turn them with my fingers kids must have come outside during the last install and got me side tracked didn't have time to test drive but i tightened it up and it cranked faster than ever hope that was the problem
I had a situation on a Cherokee we built. It would cut out, then high idle, then not start. It was a newer OBDII so we hooked up our Snap-on scanner to look at what was wrong. We could connect to the ECU, but the data kept disappearing and we had to re-start the vehicle, kill it, and the start reading again. We could not get a consistent connection for a running read either.

We assumed the ECU was borked and ordered a reman ECU. Once installed, the same issues happened.

From there I went through all of the ignition system checking for anything out of place. I visually inspected the coil and pulled the coil wire to replace the cables and noticed the two nuts that grounded and held the coil on were loose. I tightened them up, replaced the plug wires, and the issue went away forever.

We all miss things. I'm pretty sure a loose or floating CPS would cause the ECU to no know, at times, where the crank is and cause it to shut everything down to be safe.

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post #10 of 11 Old 05-05-2021, 04:55 PM
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If you cannot fix it with a hammer then it has to be an electrical problem.
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post #11 of 11 Old 05-09-2021, 08:00 AM Thread Starter
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Well tightening up the crank sensor didnt solve the problem
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