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Unread 03-30-2013, 06:57 PM   #1
taylorbapt
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1999 XJ Cherokee 
 
Join Date: Jun 2012
Location: Shawnee, Oklahoma
Posts: 4
Xj wont stay running

I have a 99 Xj 4.0L. When I'm driving and slow down it dies and when I start it and let it idle it runs for a bit and then it's idle gets bad and jerks and dies, does anybody have any ideas what can cause this?

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Unread 03-30-2013, 07:03 PM   #2
CJ7-Tim
Real Jeeps have dents.
 
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2000 XJ Cherokee 
 
Join Date: Apr 2002
Location: out in the garage - Minneapolis, Minnesota
Posts: 21,317
Are all the tune-up parts fresh ? The problem might be a battery issue, a failing O2 sensor, or a faulty Crankshaft Position Sensor. Start with the cheap and easy stuff. Test the sensors before you invest in any new parts.


Stalling can be caused by a low voltage issue from:
  • a failing battery
  • a failing alternator
  • dirty or loose wire connections
  • internally corroded battery wires
Perform routine maintenance of the start and charge systems. Remove, clean, and firmly reconnect all the wires and cables to the battery, starter, and alternator. Look for corroded or damaged cables or connectors and replace as needed. Copper wires should be copper color, not black or green. Do the same for the grounding wires from the starter to engine block, and from the battery and engine to the Jeep's frame/body. You must remove, scrape, and clean until shiny, the cable/wire ends, and whatever they bolt to. Jeeps do not tolerate low voltage, bad connections, or poor grounds.
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Unread 03-30-2013, 07:08 PM   #3
taylorbapt
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1999 XJ Cherokee 
 
Join Date: Jun 2012
Location: Shawnee, Oklahoma
Posts: 4
Thanks i will check it all and see if I can find anything bad, I've changed to O2 sensors, are crankshaft position sensors hard to change?
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Unread 03-30-2013, 07:23 PM   #4
CJ7-Tim
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2000 XJ Cherokee 
 
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Location: out in the garage - Minneapolis, Minnesota
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Not much worse to change than O2 sensors.
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Unread 03-30-2013, 09:11 PM   #5
Hudson
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1999 XJ Cherokee 
 
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Location: New Milford, Connecticut
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You need about three 6" extensions and swivel to unbolt it.

You might also need to take a few yoga classes to get your body in the right position to get to that sensor.
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