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Old 08-11-2009, 04:00 AM
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New member with 94 YJ headaches

Well I am glad to find a new forum to try and draw from all your knowledge on YJ issues. My YJ hates to stay running, I have replaced most everything in the fuel system and alot of the electrical system. It has boiled down to no spark from the coil whenever the jeep decides it doesnt want to start or run. Sometimes it starts sometimes it just cranks. I have replaced the coil, dist. cap and rotor, plugs, wires. I tried the crankshaft pos. sensor too. Nothing has seemed to help at this time. The local garages are stumped as to what else to try. In the last 2 years I have only been able to drive it 300 miles total. I am willing to try most anything at this time. I cant find a jeep in a junkyard or pull a part within 100 miles of here that has anything that might help. So please let me hear what you think, its almost come down to making the jeep a planter in the local junkyard......I dont wanna part with it though.
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Old 08-11-2009, 06:43 AM   #2
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Old 08-11-2009, 10:47 AM   #3
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let me guess it runs till it gets hot and then sort of just craps out or dies sounds to me like the ignition controll module and i really think we need a sticky article on this seems to be a really common prob or i'm just crazy either way just my opinion by the way just hang in their man we will help u out if im wrong some one here will probably get u what u need to know
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Old 08-11-2009, 11:52 AM   #4
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bad coil is what it sounds like
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Old 08-11-2009, 12:08 PM   #5
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Could be the camshaft position sensor in the distributor. Have you done anything with the distributor other than the cap and rotor?

Could also be a bad ASD relay...
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Old 08-11-2009, 01:53 PM
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Morphios---- no it does NOT get hot, it may idle for less than 5 minutes and then it just shuts off like you turned the key.
Spaz-- the coil is brand new.
dos0711--I have only changed the cap, rotor wires and plugs.
THe jeep is not getting spark from the coil most of the time. I have pulled the plug wires and no spark then the coil wire and no spark. It only sparks when it decides it wants to spark.
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Old 08-11-2009, 02:37 PM   #7
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i'v just heard of them getting hot a lot but they can just not work too
were their located can cause them to screw up from heat and water over the years witch is y i thought ignition control module but dos0711 might be on the right path to u can get the control module tested to see if thats it
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Old 08-11-2009, 02:53 PM   #8
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x2 on what dos said then or it could be the ecu
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Old 08-11-2009, 02:58 PM   #9
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could be the ecu if that turns out to be it then i'd nutter ur jeep its easier then replaceing the ecu unless u live were u have emission testing
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Old 08-11-2009, 03:14 PM   #10
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When you turn the ignition key to "on" (without starting) does the check engine light come on?
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Old 08-11-2009, 03:15 PM   #11
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could be the ecu if that turns out to be it then i'd nutter ur jeep its easier then replaceing the ecu unless u live were u have emission testing
Can't nutter a fuel injected heep.
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Old 08-11-2009, 03:22 PM   #12
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whoops forgot what jeep he had my bad
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Old 08-11-2009, 05:20 PM
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OUCH dos, now its a heap........If it ever runs again I will have to post a pic so you can see my heap
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Old 08-11-2009, 06:02 PM   #14
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he said heep.....the j is right next to the h. have fun with your new machine.
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Old 08-11-2009, 06:06 PM   #15
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they're all heeps

are you sure you aren't missing anything else besides spark. injector pulse is a big clue if thats missing to.

or just try replacing the whole distributor to eliminate the icm, and cam sensor.
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Old 08-11-2009, 10:16 PM   #16
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It's fuel injected...he can't really eliminate the cam sensor can he?
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Old 08-12-2009, 01:46 AM
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jpdocdave I am not getting spark from the new coil at sometimes. we checked it right of the coil wire and no spark then 5 minutes later it might spark and the heep can be ice cold. Gonna try to do more checking again today.
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Old 08-12-2009, 02:09 AM   #18
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Just throwin this out there...have you checked for good grounds?


and btw don't overuse heep
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Old 08-12-2009, 08:18 AM   #19
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It's fuel injected...he can't really eliminate the cam sensor can he?
i was saying elimnate the possibilites by buying a distributor as an assembly, if i remember right it has the ignition module and cam sensor all together.
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Old 08-12-2009, 08:25 AM   #20
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I don't see a "module" in the distributor. It's my understanding that the PCM handles all of that.

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Old 08-12-2009, 09:11 AM
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Now I just need to find out ho to test and check the PCM....lol. Sounds like more fun
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Old 08-12-2009, 09:13 AM   #22
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ok doc has a point check for injector pulse and make sure its not a compound problem if u dont know how to do this u can just run to a parts store and get the tester plug it into the injector wiring clip and see if it lights up if it does then we at least know its only spark and not more
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Old 08-12-2009, 11:24 AM   #23
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I don't see a "module" in the distributor. It's my understanding that the PCM handles all of that.

the distrib just has a hall effect cam sensor it also wont cause a no start
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Old 08-12-2009, 12:37 PM
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Well I have done what I can do and have come to the conclusion I will NOT be able to find the problem or problems. I am hoping to be able to finish the paint job by early next week and then I hate to say it but Craftsman will be given a call. Gonna haul it to the jeep dealer and let them break my broke bank. I know so many mechanics and everyone wants to get in your pocket even though you have helped them out a bunch of times. Next time they come to my shop for paint and body work it will be full price and no deal. <--- keeps getting kicked while he is down.
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Old 08-12-2009, 12:51 PM   #25
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well its ur call but let us know what the problem is so we can all figure this out and help any future people that way have this prob
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Old 08-12-2009, 02:42 PM
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I think I have dumped enough into all the things it could be and I have not gotten any sure fire way to figure out what I really need to replace to get it back on the road. So let someone else mess with it and I hope it doesnt hurt to much.
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Old 08-13-2009, 05:53 AM   #27
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Keep us up to date! It might help someone with the same problem one day!
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Old 08-17-2009, 06:01 AM
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jsreichard!!!! here are the replies I have gotten so far in my search to get my jeep back on the roads.... I hope they might help you out
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Old 05-18-2011, 11:20 AM   #29
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any word on what the problem was? im having the same problems with my 94 yj 6cyl: no power to the coil, unless i sit there for 10 minutes trying to start it (almost like something has to warm up to get power), its actually triggering my ASD. any help is appreciated.
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Old 05-18-2011, 11:46 AM   #30
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bad grounds or ECU. (PCM) Primary control module or computer as its called...

Mine had a symptom (1994) where you'd turn the key on with no power getting to the fuel pump. After 2-20 minutes with the key on it would kick up and the check engine light would come on. Then it would be ok... Replaced the PCM over a year and a half ago, not a problem since.

Secondy, my jeep used to cut out all the time with no spark. Drove me nuts... turned out to be bad connections on the oposite side of the battery cables. (vibrated to be finger tight at the starter and ground) Cleaned the connections and cranked 'em tight. Never looked back!

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