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Old 12-08-2009, 10:46 AM   #1
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Help!!! No spark!!

Hi I have the 89 yj 2.5 today it would not start, cranks just fine but no spark from the coil ,is there some kind of relay under the dash that can keep the signal from going to the coil? I do have power to the coil. anybody ideas ???

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Old 12-08-2009, 12:13 PM   #2
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This is seeming to become a more common problem. I had this problem, replaced my coil, nothing. Replaced the CPS, nothing. Turned out being the ECU/PCM. I could hear a relay click off, which was happening because the computer was telling it something was wrong, and to cut off. Dunno where it is on an 89 though.

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Old 12-11-2009, 11:43 AM   #3
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hey i got in this morning and it started right up i went to the store and stupid me turned off the engine and sure enough it would not start again its driving me crazy!! HELP!!
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Old 12-12-2009, 02:50 AM   #4
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So i had to call a friend for a tow back home, and Last night tried it and it started right up so i shut it down and started it again ,did this about 4-5 times all normal but i know as soon as i go somewhere i might be stranded so the jeep is useless to me! can anybody help ?????? or is this forum for easy stuff like how to change a bulb. any ideas would be much appreciated thanks.
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Old 12-12-2009, 04:03 AM   #5
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Quote:
Originally Posted by yjking View Post
can anybody help ?????? or is this forum for easy stuff like how to change a bulb.
Easy bro, electrical problems can be very tough to diagnose from halfway across the country behind a computer. I have had similar problems over the years when my jeep started and I go off somewhere and then can't get home. I would suggest back tracking any mods having to do with the ignition system such as wire splices and connections. I swapped a AMC V8 into my 89 and used what I could of the original system and had a similar problem. For me it turned out to be a loose wire crimp leading from the battery to the starter solinoid on the firewall. If it runs okay until you turn it off I would check all wire connections first.
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Old 12-12-2009, 11:52 AM   #6
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Okay. Let's start simple. Check the major grounds. I'm no electrical guruu, so hopefully someone else here can tell you exactly where those grounds are. I know there are two main ones, one of which is on the engine side firewall in pretty plain view. Check it, clean it, etc. Disconnect your battery and whether it LOOKS clean or not, clean the terminals and the connectors. Find your PCM/ECM/ECU, whatever you want to call it, I'm sure google can help to find that, or a Chilton manual, disconnect it, get some electrical parts cleaner spray, and spray down the connectors, on both the ECM and connector side. Hell, get some electrical grease and spray that in there afterwards too. If that doesn't help, I really don't know what to tell you, But I'm sure someone else here does.


Okay, I looked it up. You have an Ignition Control Module that is included with the coil. Since this takes the place of the PCM in later models, I would try cleaning any connectors present, or replacing it. But try the simple stuff, like grounds and battery terminals first. Chillax, we try our best, but sometimes its down to who sees the thread and who doesn't, because not everyone knows everything. We aren't like other forums where you have to defend yourself or fight to survive, so stay chill, and for the most part, we'll stay pretty helpful, or atleast try to be.
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Old 02-10-2010, 01:46 AM   #7
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the problem still exists the list of parts replaced is--
tps
cps
icm
coil
plug wires
cap&rotor
fuel pump
all fuses & links
2 relays next to battery
it will start in the morning go somewhere shut off try to start it again 10-15 minutes later and it cranks strong but no start ,its not getting spark! i dont have acces to a new computer but i think thats next ,ive read a post i think was called brain surgery but i dont know if it applies to the 89 yj 2.5 ?
can somebody help ?
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Old 02-10-2010, 11:37 AM   #8
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START SIMPLE. Check every wire connection and especially any that have been "spliced" or appear burned or worn. I had something similar happen to me awhile back and it ended up being one of the wires coming from the coil to the distributor. The heat from the manifold had caused it to fry and it only shorted when the moon was aligned just right.
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Old 02-10-2010, 12:33 PM   #9
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Check all the wires in the wiring harness as suggested, always a good place to start. Check around on ebay for a computer, even check around in local junk yards and such. At least all the stuff you just replaced won't fail on you anytime soon :P (Hopefully)
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Old 02-20-2010, 10:04 PM   #10
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had that promblem before but not with a jeep.try pickup in distributor cheaper than computer
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Old 02-20-2010, 10:36 PM   #11
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I am having the same problem with my 90 wrangler ( older model 304 no computer). Just died going down the road and can't get ANY fire from the coil. Replaced the coil...nothing...installed HEI system....nothing. Will turn ove strong but no fire. I have read all post and will start tracing wires...again. Please HELP! AAAAHHHHHH!
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Old 02-21-2010, 10:20 AM   #12
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Greetings, I have had the same issue with an 89 Cherokee. When it did not start or cut out while driving (idling at a light) I would have to kick the wiring harness to the ECU a few times, then it would start. There was a problem with a connection at the large connector to the ECU. Replaced unit, checked all wires cleaned connecors - same.
Sold it!
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Old 02-21-2010, 10:06 PM   #13
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It seems I've solved my problem, Jeep is running good so far...guess I had a short comming from the solenoid. Not real sure.
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Old 02-23-2010, 08:57 PM   #14
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I had the same problem with my 89 2.5 this past weekend. It ended up being the crankshaft position sensor. $32 at autozone.

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