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  #1  
Old October 19th, 2008, 14:42
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Jesusfreak0190 Jesusfreak0190 is offline
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90 xj wont stay started

I have a 90 xj and when it is cold outside it wont stay started unless i hold the key in the crank position but once I let go it shuts right off. I have changed the ignition switch, crank position sensor and key cylindor, removed the ballast resistor, I even tried putting a space heater under the steering column to see if I warmed it up if it would start. that did not work it must be something in the engine. Any ideas?? I NEED SOME HELP! I HAVE ALREADY BEEN THROUGH TWO STARTERS!!
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  #2  
Old October 19th, 2008, 15:18
MapleDitch MapleDitch is offline
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Re: 90 xj wont stay started

Check your fuel pump relay. And more importantly, check the fuel pump relay socket for corrosion. Flip the socket upside down and look at the underside.

Also check the fusable links beside the battery.



The fuel pump relay is bypassed when the key is in the crank position.
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  #3  
Old October 19th, 2008, 16:57
thethinginthewoods thethinginthewoods is offline
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Re: 90 xj wont stay started

the ballast resistor is necessary. Had the same problem, and it turned out that i just had a loose wire going to the ballast resistor. try installing a new one and double checking your connections.
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  #4  
Old October 19th, 2008, 17:19
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Harlee&Tahoe Harlee&Tahoe is offline
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Re: 90 xj wont stay started

http://www.lunghd.com/Tech_Articles/...iagnostics.htm

A lot of great info on this site.
Check your grounds, maybe temp sensor IAT
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  #5  
Old October 19th, 2008, 17:48
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Matthew Currie Matthew Currie is offline
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Re: 90 xj wont stay started

If the ballast resistor or its connections are bad, you can simply bypass it. Earlier and later models did away with it altogether, with no apparent effect on fuel pump life. It's mostly to reduce noise.
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  #6  
Old October 23rd, 2008, 10:01
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Jesusfreak0190 Jesusfreak0190 is offline
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Re: 90 xj wont stay started

figured it out!! it was the fuel pump relay
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  #7  
Old October 26th, 2008, 15:19
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Tommy_Harrell Tommy_Harrell is offline
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Re: 90 xj wont stay started

similar problem... my '90 does the same thing, you can pull the fuel pump relay and put a jumper wire from pin 30 to 87.
putting power to the resistor ballast will keep mine running, but the jumper wire will not
any suggestions?


Tommy
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  #8  
Old October 26th, 2008, 17:20
MapleDitch MapleDitch is offline
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Re: 90 xj wont stay started

In your case, I would check or change the ignition switch.
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  #9  
Old October 27th, 2008, 14:08
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Jesusfreak0190 Jesusfreak0190 is offline
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Re: 90 xj wont stay started

you know you really dont need the ballast resistor I would just take it out and wire the wires that go into it together
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  #10  
Old December 4th, 2008, 17:58
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Tommy_Harrell Tommy_Harrell is offline
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Re: 90 xj wont stay started

the fuel pump relay isnt getting power, so i have ran a fused, jumper wire with a toggle swtich to the place where pin 87 on the relay would go.
flip the switch on, start the jeep; shut the jeep off, flip the switch off. its workin for me now
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  #11  
Old October 15th, 2021, 18:50
Brad_Leroy Brad_Leroy is offline
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Re: 90 xj wont stay started

Had the very same problem. It was the fuel pump relay. Switched it out - no more problems - after a week of trying many other things! Thanks for your post. (13 years later!)
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