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Old 10-19-2009, 12:17 PM   #1
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89 yj died again

ok this is the second time its done this in the past two weeks i need some serious advice, i changed the fuel pump which i thought was the problem but it was the relay, then yesterday it died agian i bought a new relay to try but that wasnt the problem. i dont know where to start, i have fuel and spark, it turns over but wont start.

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Old 10-19-2009, 12:18 PM   #2
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do u have injector pulse start their if u have injector pulse that a good sign

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Old 10-19-2009, 12:25 PM   #3
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i dont know how i would check that
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Old 10-19-2009, 12:40 PM   #4
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one of two things either u take a volt meter and read the the voltage out of the injector wiring clip or u go to the parts store and get a injector tester that plugs in and lights up if u have a pulse
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Old 10-19-2009, 12:50 PM   #5
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and if i have injector pulse where do i go/and if not
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Old 10-19-2009, 12:57 PM   #6
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if not then I'm guessing that u have a bad ecu or icm if u do have injector pulse then i don't know were to take it after that just give it a couple of hours their will be some one who will have more info for u but in the mean time check the injector pulse
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Old 10-19-2009, 01:10 PM   #7
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ok thank you very much i will go home check that then will post what i find out
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Old 10-20-2009, 12:14 PM   #8
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checked again and i actually dont have spark but have fuel changed the coil but that wasnt the problem, there is no power to the coil is there a wire that i could check or a relay or some way to tell where the power stops. please help
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Old 10-20-2009, 12:19 PM   #9
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ah ha know this makes more seance this sounds like a ignition control module. they go bad after time its located under the washer resiviour and coolant overflow. the little box can cause this whole system to not work. take it out and get it tested at advance i think they still do it. if that is not the prob look into the cps
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Old 10-20-2009, 07:57 PM   #10
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changed the cps still doesnt run i just want to make sure its the ignition module before i go and by it is there away to test it because no one tests them anymore
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Old 10-20-2009, 08:23 PM   #11
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Are you positive the coil is good?
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Old 10-20-2009, 08:32 PM   #12
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Doe's anyone think or know if one of those nice little code readers would tell you exactly what the problem is? I have been looking at these little gems but wasnt sure if they would be all their cracked up to be, worth the money?
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Old 10-20-2009, 09:41 PM   #13
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to old for code reader but yeah i dont know what to tell u if they wont test it try calling the jeep dealer near u
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Old 10-21-2009, 08:24 AM   #14
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positive the coil is good just changed it im thinking now its the ignition module but i want to make sure before i spend the $100 because i keep buying new parts that i dont need. im not complaining because there new but i just want to make sure, if anyone knows a way to test it please let me know
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Old 10-21-2009, 04:50 PM   #15
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I have an 89 that had the same problem. It was a bad Ignition Control Module. I agree with Morphious. No way to accurately check it. I had to pay 130.00. 100.00 sounds like a good price. You could probably get a used one but why take a chance doing that. Spend the 100 and you'll be back on the road.
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Old 10-22-2009, 09:51 AM   #16
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i went to advance today and they checked it and its not the igniton module, im going to bring my ecm to a jeep dealer today to see if its that. i checked the wires they are good from what i see but which color wires should i be looking for exactly?
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Old 10-22-2009, 02:07 PM   #17
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the dealer was going to charge me $89 to check it so i took it back to carquest and it is still under warranty so i got a new one coming to me tomorrow but if its the ecm then i have a major problem because i just changed it 6 months ago and i know i have no water leaks, so could it be a ground or a wire thats making it do that and i dont understand if it were to be a wire or a ground why would it take so long to do damage.
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Old 10-26-2009, 02:51 PM   #18
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changed the ecm it runs but now stalls and sometimes sputters when driving i dont know what would cause this?
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Old 10-26-2009, 05:05 PM   #19
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I don't see how they can accurately check that, especially when the symptoms you describe match a bad Ignition Control Module. A bad one will work intermittently at times. They don't just either work or not, it depends on a lot of factors. I don't trust that Advance is able to check it properly because if you have output, it may work on the bench and then when you add vibration, heat etc. it may not function properly. I still believe that if you swap it out you'll solve your problem.
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Old 10-26-2009, 05:38 PM   #20
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Grounds, grounds, grounds. The most common cause is usual grounds. And check the plug on the driver side that goes through the firewall.It connects to the fuse block under the dash. They corrode and hold moisture. I've changed a shit load of them. and i happen to have one lying around if that's your problem
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Old 10-27-2009, 06:53 AM   #21
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grounds

I agree with Satchel. I bought an 89 YJ over the summer. A guy had it at a garage and the bill got to 1500 bucks and still didn't run. I talked to the mechanic and he said it was definitely the distributor. In looking it over after I got it home, the plugs, wires, coil, distributor, ecm, starter had all been replaced. I found a ground that was arcing, cleaned it up, tightened it down, it started. Grounds are huge, check them all...it costs nothing.
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Old 10-27-2009, 08:18 AM   #22
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they are right grounds can cause ur initial no start but would it cause the bad idle? i agree with kik if u did the ecu swap already then i would say its still the icm. it don't always happen but the test can come back wrong once and awhile. or the tester is retarded and don't know what he's doing. all factors but seeing as u have already stuck the time and effort so far check the grounds and the block that satchel1 was talking about if thats not ur prob then it has to be icm.
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Old 10-27-2009, 01:00 PM   #23
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would the grounds be the reason why the ecm is burning out so fast, and is there any other things that i should check
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Old 10-27-2009, 02:08 PM   #24
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they would definitely cause the icm or pcm to fail. I would start there first. And even if they look ok I'd still add a ground from the battery to the frame, and one to the body. I have six added grounds to my YJ just to be safe.

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