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Unread 10-27-2013, 04:53 PM   #1
Jimbo58
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1994 YJ Wrangler 
 
Join Date: Sep 2010
Location: Sarnia, Ontario
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jeep won't start need help

I need help with my Jeep it cranks but won't start. It's a 94yj with 2.5 5speed only mod is remove air box and replace with cold air intake, this was done many years ago. Yesterday on the way home from work at highway speed the motor stumbled and almost quick a couple of times then it recovered and seemed to be fine for the rest of the drive home which is about a 25 mile trip each way. I knew that the o2 sensor needed replace via codes from check earlier in the week. So I changed the o2 sensor and fired up the heep and it ran for about a minute and shut down, and now it will crank but not start. There is fuel at the rail and from what I can tell there is no spark.
From my search here every says cps but I don't have a one around and no one has one in stock. It is my dd and need it to get to work is there any other cps compatible

Others said computer, which I have a spare, change it and same thing. So went back to original and now I can not get any codes to see what the heck is going on I am stumped any help would be great and deeply appreciated.



Thanks Jim

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Unread 10-27-2013, 05:37 PM   #2
jokerchief462
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CPS, coil or ICM.

Sent from underneath my Jeep
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89YJ 2.5L TBI, AX-5, NP231 SYE, Ford 8.8, Yukon Grizzly, Tom Woods Shaft, 33" BFG T/As, 4" lift, Warn VR10000s.

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Unread 10-27-2013, 06:03 PM   #3
Jimbo58
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thanks ill check getting cold out there. no garage to work in now
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Unread 10-27-2013, 07:40 PM   #4
scraper
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I would check for spark as far as you can to eliminate some sensors. So check for spark at the distributor, then coming out of the coil, then going into the coil. Chances are it's somewhere in there. If there is no spark going to the coil then chances are its the CPS. Definitely trouble shoot the electric before you go randomly replacing stuff.
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Unread 10-27-2013, 08:29 PM   #5
Jimbo58
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thanks for the advice I will have wait for daylight now
and you are right I don't want to put anymore money into this yj I have another one that I have rebuilt and almost ready for the road.

Thanks Jim
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Unread 10-28-2013, 11:42 AM   #6
Que89YJ
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If you are in Sarnia you can get a crank position sensor. Hell, I could probably throw one across the Blue Water to you. I dont think that is what is going on, at least not now. If you arent getting any codes at all; that means no 12,33, or 55 when you check using the key method, then you need to run this threads checks:
http://www.jeepforum.com/forum/f12/9...lained-490788/
If you arent getting codes you have probably got a blown fuse. This thread should help.
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Unread 10-28-2013, 07:37 PM   #7
Jimbo58
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Thanks for the link I am willing to try anything. The thing is that I have a spare computer and have changed it and still no start, so l will have to check for power lose somewhere.

Thanks Jim
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Unread 10-28-2013, 08:09 PM   #8
Que89YJ
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The post walks you through power and ground checks. Follow the post. Sentinel made one of the best electrical post ever. Read it and post back what you find.
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Unread 10-28-2013, 08:37 PM   #9
Jimbo58
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Quote:
Originally Posted by Que89YJ View Post
The post walks you through power and ground checks. Follow the post. Sentinel made one of the best electrical post ever. Read it and post back what you find.
Thanks and I will when get some day light no garage.

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Unread 10-29-2013, 07:55 AM   #10
pasinbuy
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A easy quick check for cps is to unplug it for a minute. The plug it back it. If she starts your cps is bad.
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Unread 10-29-2013, 10:52 AM   #11
Que89YJ
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Oh and check for fault codes:
http://www.jeepforum.com/forum/f12/h...codes-1257145/
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Unread 10-29-2013, 08:32 PM   #12
Jimbo58
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up date

I know how to get the cel codes from the jeep from help from the forum when I first got my jeep, but thanks anyway. That being said, when I tried to check for codes all I get is a solid cel no codes at all. What's up with that, always been able to get codes.
Next after following Sentinal02's test procedures using an analog meter . I get voltage on number 1, and no voltage on fuse number 4 the orange 40 amp fuse, but I have voltage at the fuse box dome light and Ign-Lps, I have not checked the ignition switch yet, but if I am reading it right something is screwy or I made a mistake somewhere.
Just a little more info, at the power distribution centre the only fuse that has power with or without the key is number 1


Thanks Jim
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Unread 10-30-2013, 09:20 AM   #13
Que89YJ
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Do you have power on pins 3&9 on the ecu with the key on?
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Unread 10-30-2013, 06:55 PM   #14
Jimbo58
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Quote:
Originally Posted by Que89YJ View Post
Do you have power on pins 3&9 on the ecu with the key on?
I just got home from work and it is too dark out side now I will check tomorrow after work and post findings then.
Thank you for your help I am getting frustrated but then again that's part of owning an older jeep. lol



Thanks Jim
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Unread 11-01-2013, 07:42 PM   #15
Jimbo58
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Location: Sarnia, Ontario
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Quote:
Originally Posted by Que89YJ View Post
Do you have power on pins 3&9 on the ecu with the key on?
I checked it today when got home from work and there is no power there.

Jim
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