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Unread 11-09-2010, 01:09 PM   #1
floridamud
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having issues with stock 95 xj cherokee 4.0

the jeep: 1995 jeep xj cherokee with 4.0L automatic, 182K miles

here's the problem: every now and then when you get in the car and go to start it it will crank and fire but as soon as you let go of the key it dies, so it turned out not to be the fuel pump, i replaced the filter anyway, now the issues have gotten worse, as stated before they are still intermittant, sometimes it starts like normal, sometimes it doesnt want to, today it refused to start for quite some time, the 30sec trick did not work, nor did rocking the key back and forth between off and accessory, but interestingly right before it finally started while the key was in accessory the check engine light came on flashing, and turned off once the car was started, also it seems when the car does have issues starting after it has started it seems to run slightly rough for about the first 30 seconds then smooths out, no other issues while driving, only the intermittant starting issues, most likely something electrical is my assumption, any ideas?

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Unread 11-09-2010, 02:19 PM   #2
dukie564
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so if i understand correctly, if you turn the key and it starts, then let go of the key it shuts off? That's an ignition switch problem - it needs to be replaced
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http://www.jeepforum.com/forum/f22/project-danger-cart-xj-1297118/
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Unread 11-09-2010, 02:36 PM   #3
floridamud
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yes that is exactly what it is doing, can the ignition switch go bad in an intermittant fashion?
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Unread 11-09-2010, 02:38 PM   #4
dukie564
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yessir
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1995 XJ Cherokee Sport
4.5" Homebrew Lift, 4.0L HO I-6, AX-15, NP231, D30(Open)/C8.25(Locked)
33x12.5 Mickey Thompson Baja MTZ Tires, 283,000 mi and runnin' strong
http://www.jeepforum.com/forum/f22/project-danger-cart-xj-1297118/
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Unread 11-09-2010, 04:23 PM   #5
tjwalker
It's the crank sensor!
 
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Agree with dukie. Sounds like the switch. It also appears that it is getting worse.....replace it.

The symptom of "rough running" for the first 30 seconds though, is not related to your starting problem. Always review tuneup hardware FIRST. That involves fresh spark plugs, plug wires, distributor cap, and rotor.
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Unread 11-10-2010, 08:31 PM   #6
floridamud
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i've had a few people also say crank position sensor, could this be the culprit or is it the ignition switch?
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Unread 11-10-2010, 11:08 PM   #7
egodfrey
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ignition switch would be where i would start
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Unread 11-11-2010, 06:45 AM   #8
dukie564
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wouldn't be the crank sensor if it shuts off when you let go of the ignition switch
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1995 XJ Cherokee Sport
4.5" Homebrew Lift, 4.0L HO I-6, AX-15, NP231, D30(Open)/C8.25(Locked)
33x12.5 Mickey Thompson Baja MTZ Tires, 283,000 mi and runnin' strong
http://www.jeepforum.com/forum/f22/project-danger-cart-xj-1297118/
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Unread 11-11-2010, 06:55 AM   #9
tjwalker
It's the crank sensor!
 
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Not a crank sensor issue. You have had a flaky ignition switch for a while and it is getting worse...
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Unread 11-11-2010, 07:45 AM   #10
floridamud
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ok you guys sound pretty sure! i'll replace it today! thanks!
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Unread 11-11-2010, 08:02 AM   #11
dvonrick
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Real cheap thing to try is replacing the ballast resisitor (ceramic thing with 2 wires usually located on driver side fender inside the engine compartment). Usually they aren't intermittent but do cause the failure to run when dropping the key.
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Unread 11-11-2010, 08:09 AM   #12
dukie564
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91+ Cherokees don't have ballast resistors
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1995 XJ Cherokee Sport
4.5" Homebrew Lift, 4.0L HO I-6, AX-15, NP231, D30(Open)/C8.25(Locked)
33x12.5 Mickey Thompson Baja MTZ Tires, 283,000 mi and runnin' strong
http://www.jeepforum.com/forum/f22/project-danger-cart-xj-1297118/
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