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Old 08-05-2010, 04:52 AM   #1
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cutting out

Hi I have a 89 YJ with a 4.0 out of a 90 jeep chrokee and it runs goo when its cold, but when it gets to temp. it cuts out at about 2500 rpms i have changed the enginge coolant temp sensor and the intake manifold air temp sensor with no luck. Im thing maybe the crank shaft position sensor or the cam shaft position sensor does this make sence to any one

and sorry I dont explain things good so if you have to ask questions please do so

Thanks for your time and help

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Old 08-05-2010, 10:37 AM   #2
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I'm working on 2 jeeps a 94 and 97. both cut out around 3000 rpm. I can't tell you how to fix it yet, but I should know in a few days. going to swap out distributor and cam sensor first. the next thing will be the alternator. talked to a mechanic I trust and he's found alternators putting out a AC pulse when the diodes start to go bad. also going to check the map sensor, thats just easy to change and I don't think thats the problem but maybe.

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Old 08-05-2010, 11:34 AM   #3
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Just had the same problem with a 2.5 last week.....mine was a bad O2 sensor
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Old 08-05-2010, 09:43 PM   #4
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I'm working on 2 jeeps a 94 and 97. both cut out around 3000 rpm. I can't tell you how to fix it yet, but I should know in a few days. going to swap out distributor and cam sensor first. the next thing will be the alternator. talked to a mechanic I trust and he's found alternators putting out a AC pulse when the diodes start to go bad. also going to check the map sensor, thats just easy to change and I don't think thats the problem but maybe.
Thanks please keep in touch let me know what you find
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Old 08-05-2010, 09:45 PM   #5
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Just had the same problem with a 2.5 last week.....mine was a bad O2 sensor
Thanks for your help and Time I will let you know what happens
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Old 08-06-2010, 10:25 AM   #6
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changing distributor tonight, so hopefully thats it. problem is I'm going to try to put a 95 distributor in a early 94. there's a slight difference.
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Old 08-06-2010, 10:33 AM   #7
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Do you by any chance hear a weird noise in your engine when it happens? I sometimes hear like a farting noise once I hit 3k RPMS (only happens somtimes when im on the express way) and the jeep just sounds like it wants to turn off and makes me down shift
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Old 08-06-2010, 12:27 PM   #8
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I was going to suggest the O2 sensor as well....not sure about the whole fart'n thing, but jeeps do have a personality of their own!
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Old 08-06-2010, 10:50 PM   #9
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changing distributor tonight, so hopefully thats it. problem is I'm going to try to put a 95 distributor in a early 94. there's a slight difference.

Good luck hope it works for you

Today I tryed cleaning the connections on the plug or my crank postion sensor and it hasnt messed up on me yet but its a nice cool day also I try again 2marrow.

did i mention I not the best speller
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Old 08-09-2010, 10:03 AM   #10
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so did the the distributor swap. seems to have fixed the problem. still don't know if its distributor or cam sensor. need to do more checking, but the 94 is running strong again. I'll probably swap in a 95-97 distributor in my 93. looks like a better design. the numbers to look for if your at a junk yard are 7028, thats the last four numbers on the distributor. It has a 1/2 inch shaft compared to the 91-early 94 which is 5/16.
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Old 08-09-2010, 01:38 PM   #11
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so did the the distributor swap. seems to have fixed the problem. still don't know if its distributor or cam sensor. need to do more checking, but the 94 is running strong again. I'll probably swap in a 95-97 distributor in my 93. looks like a better design. the numbers to look for if your at a junk yard are 7028, thats the last four numbers on the distributor. It has a 1/2 inch shaft compared to the 91-early 94 which is 5/16.
Good to hear that worked for you, I got stuck with overtime this weekend so maybe next weekend I'll be able to work on my jeep, I was able to do a test on my crank position sensor and ohms read ok but the test says I suposed to get 0.5 to 0.8 votls AC out of it with it being unpluged and cranking the motor over but I'm getting 152.8 muilivolts instead so I think I will change that and the distributor
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Old 08-26-2010, 07:24 PM   #12
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Good to hear that worked for you, I got stuck with overtime this weekend so maybe next weekend I'll be able to work on my jeep, I was able to do a test on my crank position sensor and ohms read ok but the test says I suposed to get 0.5 to 0.8 votls AC out of it with it being unpluged and cranking the motor over but I'm getting 152.8 muilivolts instead so I think I will change that and the distributor

ok finally I got time to change my crank shaft position sensor, and this took care of the problem now the jeeps running again just in time for the hunting season

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