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Old 02-03-2009, 07:01 PM   #1
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93 4.0L starting problems...HELP!!

I have a 93 YJ convert from a 4 cycl to a 4.0L When i bought it, it would take 3 times turning the key to start and keep running. first time nothing just cranking, second time cranking then a sputter and then stalls out, third time sputtered then ran... idle dipped to about 200rpm then up to 1000rpm then ran fine. NOW I replaced the battery, and fuel filter as advised in the manual. Jeep starts just the same as before... when it does start and i run it for 10 min or so and shut it off i cant start it again untell the next day??? any ideas??

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Old 02-03-2009, 08:07 PM   #2
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could be crank sensor issue, i've seen people have problems when swapping motors getting the crank sensor right. not sure why, but it does have to be installed correctly.

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Old 02-03-2009, 09:44 PM   #3
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I dont know if your jeep has it or not but there is a little intersection of wires on your firewall passenger side below and to the drivers side about 8 inches try cleaning all too, like replacing connectors that need it and hittin with a little water and baking soda to get rid of corosion it may help and if dont doc is right as usual
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Old 02-04-2009, 06:04 PM   #4
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Thanks! i will try that when i have my next block of free time and let you know how it goes.
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Old 02-06-2009, 04:45 PM   #5
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Ok so I ordered the CPS on ebay and im just waiting for it to arrive. My question now is, would having a faulty sensor make the jeep run rough ALL the time or just at start up? My jeep runs well once warm. Could I be having a computer issue???? Thanks for all the help!
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Old 02-07-2009, 04:05 AM   #6
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make sure that the cps is mounted correctly the part itself USUALLY will either work or not also make sure your tb is clean and exhaust and intake are free of stuff
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Old 02-07-2009, 06:24 PM   #7
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ya read the directions when installing. the only reason i say possible cps is i had one where someone put it in, didn't install it correctly and it would start and run, and after 15 mins or so it would sputter and die, and not restart untill it sat for a while. pretty weird, but when i took the sensor out, it was not mounted correctly.

and i've just seen a lot of people swap engines, and then have problems with it, like i said i don't know why they have these problems.

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