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Tom Rybak 04-29-2012 10:13 PM

Help 94 YJ 4.O Engine hesitation/stalling
High mile Jeep YJ (180,000) went in for body work and got back months later check engine light came on. OBD1 code indicated O2 sensor which has been changed. Also new throttle position sensor, plugs, wires, cap, etc. Check engine light back on again. Jeep will idle fine and run great on 5-10 min. ride and then hesitation starts as if not taking fuel. After sitting for while able to get started and will clear out and run better. Did put in new gas on top of older fuel and also added bottle of fuel injection cleaner Not sure what to try next. Any suggestions? :banghead::banghead::doh::doh:

DirtDiggler 05-01-2012 05:12 AM

Had a similar problem with my 4.0 1993 Cherokee. Seemed like it would run until it warmed up and then it would stall out. Let it sit for 5-10 minutes and would start back up again. Turned out to be the Crankshaft Position Sensor. Cheap fix at shop $80.00 and no more stalling on bridges or in tunnels! Hope this helps, best of luck!

Tom Rybak 05-01-2012 12:10 PM

Thanks for heads up. Just getting aggravated....

DirtDiggler 05-01-2012 03:56 PM

Seems to be ALL to common a problem with this engine, let us know if it was the Crank position sensor!

Tom Rybak 05-02-2012 08:35 PM

Here is the latest. Decided to change fuel filter and also stopped by napa to price crank position sensor $59.00. Not being sure it would be the fix without code indicating I held off and decided to tinker with ckp in jeep. When removed sensor it was grubby and needed good cleaning. Cleaned up and reinstalled. Took jeep for good ride and seemed to do the trick. Now the real question is was it filter or sensor? My money is on sensor. Coincidentally after running for while check engine light cleared which was a suprise. Knock wood this is the fix. Now just have to figure out how to knock idle down a bit (engine idling @ 20,000, but one thing at a time. Thanks for suggestion.

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