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Old 11-20-2013, 08:00 AM   #1
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Help trying everything

Hey guys new to the forum and tried a bunch of stuff to fix my 95 wrangler but can't seem to fix it coming on here as a last hope before going to a shop.
95 yj 4cyl
155k
Problem:
Only in the cold weather I am having cold start problems. The other day it was 60 and not a single problem. Today it's about 30 and after the car sits for a while and gets completely cold when I turn the key it'll crank and crank no turn over. I came to realize that if I leave the car in the on position for anywhere from 2 mins to 5 depending on the temp the fuel pump will eventually turn on. Then after a few(sometimes more) tries the car will start then die out then ill start it again and give it gas and ill get some back firing. Eventually the car gets warm and I don't have any problems at all I can turn it off when its warm and I can turn it right back on again no issues.
What I've changed so far:
Starter
Battery
(Both very old)
Cam shaft positioning sensor
Throttle body positioning sensor

I didn't think it's the fuel pump because once it's warm there's no issue with losing power at all whole driving or stopping...I've seen a few threads and gotten a few ideas but their problems didn't seem exactly like mine so I figured I'd ask for help...anything helps thanks a lot don't really want to take it to a shop unless I have to. Also I haven't checked the check engine light because I don't know if it's up my dash light may be out but the check engine light never comes on

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Old 11-20-2013, 11:07 AM   #2
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Search (ECM BRAIN SURGERY). Sounds like the capacitors in the ECM are bad. If you're electrically inclined you can repair yourself, or if you know someone that can do it for you or help. Otherwise you can replace the ECM and be good.

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Old 11-20-2013, 05:36 PM   #3
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Originally Posted by Redrider94 View Post
Search (ECM BRAIN SURGERY). Sounds like the capacitors in the ECM are bad. If you're electrically inclined you can repair yourself, or if you know someone that can do it for you or help. Otherwise you can replace the ECM and be good.
That's what I was thinking too might give it a shot this weekends thanks
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Old 11-20-2013, 08:37 PM   #4
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Quote:
Originally Posted by Redrider94 View Post
Search (ECM BRAIN SURGERY). Sounds like the capacitors in the ECM are bad. If you're electrically inclined you can repair yourself, or if you know someone that can do it for you or help. Otherwise you can replace the ECM and be good.
NO
Start with the basics
Fuel and spark
If the starter will spin the engine then look at why it will not run.
Shoot a little starting fluid down the intake, if it runs then you have a fuel problem if not its spark. People are way to quick to blame the computer and it is seldom the real problem.In 35+ years I have seen more ECMs replaced for no reason than you can fathom.
Key is basic diagnosis
Dont just throw parts at it.
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Old 11-21-2013, 01:43 PM   #5
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NO Start with the basics Fuel and spark If the starter will spin the engine then look at why it will not run. Shoot a little starting fluid down the intake, if it runs then you have a fuel problem if not its spark. People are way to quick to blame the computer and it is seldom the real problem.In 35+ years I have seen more ECMs replaced for no reason than you can fathom. Key is basic diagnosis Dont just throw parts at it.
He has the same symptoms and today I left the key in the on position longer then I normally do about 10 minutes and it started up no problem I can't see it being a fuel problem
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Old 11-21-2013, 07:45 PM   #6
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It has all the symptoms of the capacitors in the ECU needing to be changed. It doesn't take long and its a cheap fix.

Crash Course In Brain Surgery Replacing Capacitors On ECU - JeepForum.com

If you don't know how to solder take it to a TV repair shop and pay the guy $10 for 15 minutes of work.
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Old 11-22-2013, 06:46 AM   #7
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I have no direct experience with this but I have read quite a few threads where this indeed fixed issues very similar to yours. Basically the caps will dry out and then they will not take a charge. Sometimes they will eventually charge up if you leave the key on for a while. Once they charge up the fuel pump will kick in.

I live in central CT. I see on your profile that you are in New York. If you are close to me and can get the jeep up here, I'd be more than happy to do the soldering free of charge. I also own a 1990 4.2 and a 1990 2.5. Not sure if the ECU from my 2.5 is the same as from your '95. But I'd be happy to pull it and try it in your jeep before we get to soldering.

Good luck! Let me know if I can help.
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Old 11-22-2013, 12:46 PM   #8
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Another test for the ecm that works sometimes is to run a hair dryer on the ecm for a few minutes to warm it up, if it starts.....there is your problem.
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Old 11-23-2013, 07:29 AM   #9
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Originally Posted by Fabrokoner View Post
I have no direct experience with this but I have read quite a few threads where this indeed fixed issues very similar to yours. Basically the caps will dry out and then they will not take a charge. Sometimes they will eventually charge up if you leave the key on for a while. Once they charge up the fuel pump will kick in. I live in central CT. I see on your profile that you are in New York. If you are close to me and can get the jeep up here, I'd be more than happy to do the soldering free of charge. I also own a 1990 4.2 and a 1990 2.5. Not sure if the ECU from my 2.5 is the same as from your '95. But I'd be happy to pull it and try it in your jeep before we get to soldering. Good luck! Let me know if I can help.
Man I forgot how great these online communities are I did it yesterday and it seems to have worked appreciate the help and im in Connecticut tonight ha...I couldn't believe how easy it was but yea great fix...couldn't be happier right now...untill then next problem haha thanks everyone
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Old 11-23-2013, 08:29 AM   #10
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Glad you got it fixed!

Just a side note be carefully what you use to seal the bottom of the board. I read some where a guy ruined the traces on the Pcb using ( I think) silicone.

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