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XJ Ask the Question Thread
Junior Member
Join Date: Aug 2013
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Year: 2001 XJ
Model: Cherokee
Engine: 4.0
hey guys,
need some advice. 2001 xj getting the follwing codes,
po123: idle position sensor high voltage, po505: idle air control motor circuit shorted, P0130: upstream O2 sensor heater relay circuit fault, PO136: downstream 02 sensor heater relay circuit fault, P1491: radiator fan relay circuit open or short, P1596 speed control switch always high.
airbag light coming on intermittently. running ok other than a bucking/misfire when accelerating.
where should i start in troubleshooting.
thanks
need some advice. 2001 xj getting the follwing codes,
po123: idle position sensor high voltage, po505: idle air control motor circuit shorted, P0130: upstream O2 sensor heater relay circuit fault, PO136: downstream 02 sensor heater relay circuit fault, P1491: radiator fan relay circuit open or short, P1596 speed control switch always high.
airbag light coming on intermittently. running ok other than a bucking/misfire when accelerating.
where should i start in troubleshooting.
thanks
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Newbie
Join Date: Apr 2014
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Year: 86
Model: Cherokee
Engine: 2.8
Okay so I've been having this problem on my 86 Cherokee 2.8l 5 speed. When I get in in the morning it'll start then shut off. Then start back up and stay on but when I put it in 1st to pull out I bucks and wants to hesitate with a little driving it goes away about half way to work which is about a 20 min drive any idea? I know the idle needs to be turned down a little I'll be doing that tomorrow. But I have no idea why. Also I'm going to be putting a new fuel filter in. Any help would be appreciated.
CF Veteran
SO before i knew anything about vehicles when i got the jeep and did my first oil change i treated it with some sort of stop leak. Ive changed the oil a few times since then for whatever reason. (its gotten 3 oil changes in under 10k miles) Will seafoam in the crank case help flush all that crap out?
SO before i knew anything about vehicles when i got the jeep and did my first oil change i treated it with some sort of stop leak. Ive changed the oil a few times since then for whatever reason. (its gotten 3 oil changes in under 10k miles) Will sea foam in the crank case help flush all that crap out?
Herp Derp Jerp
Join Date: Nov 2011
Location: Parham, ON
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Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Moderator of Jeeps
Join Date: Jul 2011
Location: Frederick, MD from Cleveland, OH
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Year: 1993 YJ Wrangler
Engine: 4.0 I6
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Year: 1996
Model: Cherokee
Engine: 4.0l I6
Ran a compression test on my XJ today, really low compression on a couple of cylinders, 40PSI low. I did a wet test and it didn't change the numbers much, so I'm assuming its my valves. I remember when I took the head off, I could push tons of water through with just a garden hose.
Am I better off buying a new head, or doing a valve job?
Am I better off buying a new head, or doing a valve job?
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Ran a compression test on my XJ today, really low compression on a couple of cylinders, 40PSI low. I did a wet test and it didn't change the numbers much, so I'm assuming its my valves. I remember when I took the head off, I could push tons of water through with just a garden hose.
Am I better off buying a new head, or doing a valve job?
Am I better off buying a new head, or doing a valve job?
CF Veteran
Join Date: Feb 2012
Location: Kansas
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Year: 1994
Model: Cherokee
Engine: 190-hp, 4.0-liter I-6
Fuel pressure test at idle. With the vacuum line still in was only about 34 psi which dropped when I hit the gas. Once unplugged my pressure was at a steady 40 psi. Thoughts?? I'm not sure what's the correct psi it should be at. Also how long should te pressure hold after engine is turned off?? It held above 30 for more than ten minutes. I then unplugged the gauge.
Last edited by Cherokeekid4x4; 09-18-2014 at 06:19 PM.
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
0 to 20 psi drop in fuel pressure after running/shut off/waiting 30 minutes.
31 at idle and 39 with vac line off for the first test.
31 at idle and 39 with vac line off for the first test.
CF Veteran
Join Date: Feb 2012
Location: Kansas
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Year: 1994
Model: Cherokee
Engine: 190-hp, 4.0-liter I-6