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Unread 12-09-2009, 06:05 PM   #76
crzylgzz
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willy, did it help out? Funny, ive seen at least 10 threads onthis and each time i reference my thread lol...

but i havent the slightest clue if my thread helped at all.

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Unread 12-10-2009, 04:48 PM   #77
MountainGold
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Excellent thread. My 95 Wrangler was experiencing this problem.
Local mechanic said Chrysler PCM's have cold weather issues....but offered no fix
other than replace PCU.
Junkyard PCU ( untested ) $200 . Remanufactured unit (not in stock ) $ 360 . Jeep
dealer $$ don't ask !!
Took the PCM to local electronics repair store....$57 later...all fixed. Started right
up at 18 F this morning !!

Way to go Jeep Forum !
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Unread 12-10-2009, 04:50 PM   #78
Richmond88yj
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Quote:
Originally Posted by MountainGold View Post
Excellent thread. My 95 Wrangler was experiencing this problem.
Local mechanic said Chrysler PCM's have cold weather issues....but offered no fix
other than replace PCU.
Junkyard PCU ( untested ) $200 . Remanufactured unit (not in stock ) $ 360 . Jeep
dealer $$ don't ask !!
Took the PCM to local electronics repair store....$57 later...all fixed. Started right
up at 18 F this morning !!

Way to go Jeep Forum !
18* ouch...


57 bucks is steep though, I followed the thread and did mine for 8 dollars. (radio shack)

Hardest part wand removing the RTV from the board.
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Unread 12-10-2009, 04:59 PM   #79
MountainGold
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Yes, do it your self would be cheaper...parts cost was $ 7.20 for 3 caps . My caps had lost their
plastic shields so I did not feel comfortable pointing the "stripe" towards the heat sink tower to
line up the polarity correctly.
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Unread 12-10-2009, 09:21 PM   #80
willyb8
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what kind of silicone did you use to cover them up after?
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Unread 12-11-2009, 04:41 PM   #81
MountainGold
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Just normal clear GE Silicone II.

Temp was 13 F this morning...and wow, instant ON with the PCM . And engine seems to run smoother
now that the "engine brain" is working better.
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Unread 12-12-2009, 03:07 PM   #82
Adrenaline850
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My 94 with the 2.5 was geting harder and harder to get going as the cold temps settled in. I use this jeep exclusively to plow my/neighbors driveway other than that it sits all year. At first I thought it might be the fuel pump. But then not really as it worked well while cranking and once started. The problem I thought was that the prime cycle was too short at about 1, maybe 2 seconds. Then I stumbled acorss this thread. The giveaway was the lack of check engine light. Then after a few minutes it would flicker. This frigid morning, it would not start at all, even with CEL light coming on...I suspect the ignition coils were not powering up w/enough voltage from the pcm. I say that because last night in my heated garage, after installing an un-necessary new fuel pump..........(pain in the butt by the way with full tank and no way to get fuel out, then dropped the tank and snapped off the nipples forcing me to buy a whole new drop in sending/pick-up/pump
unit($160)), i then started fine. I then grabbed this printed out thread and headed out to radio shack and spent about $5 on 3 capacitors. It took me about 1.5 hours exactly as directed and pretty easy. My "old-faithfull" Jeep runs awesome, once again. I'd like to thank that sasquatch guy and whoever else (if I missed your handle) that posted this top notch tech info about this problem. Folk like you are a godsend. Your generous and willing insight saves us "fix-it yourself" guys like me and like many on here, the ability to get it done. I owe you a beer sir. Thanks again, very very much. FYI, my pcm was original 94 oem with 100k on the clock. merry christmas.
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Unread 12-12-2009, 03:53 PM   #83
Adrenaline850
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My last response disappeared? I just wanted tho say thank you very very much to whomever put this information on this site for me to find. this fix worked perfect.
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Unread 12-13-2009, 12:30 PM   #84
willyb8
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ok i did it today, first i tried to start the heep. 28 deg. crank,crank, no start or cel. put blow dryer on ecu for 10min. turned key cel came on and it started. so i figured it was this ecu problem. went to radio shack spent 4.50 and dug in. first off i have the 4.0L and the caps are in different spots than the other pics but they are the only 3 big ones on board. truthfully the hardest part was removing the old silicone. couldn't figure out the polarity by looking at teh caps so i went with the putting stripes the way they were on old ones and that seemed to work. took about 45min from removal to final silicone. tested it before i put final silicone on and it stared right up. then i realized it was warmed up from doing it in the house so the real test will be tonite or tomm morn.





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3.5" BDS, 5/8 MORE Booms, 1" BL, MML
AA SYE & CV,
35" Maxxis Bighorn
Smittybilt XRC8 Winch,
8.8 W/Elocker, D30 W/Aussie
Genright tube fenders
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Unread 12-14-2009, 07:59 PM   #85
willyb8
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left ECu in garage to get nice and cold overnight, put it back in and fired up first time. SWEET!!!

thanks sasquatch
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91 YJ 4.0 HO,
3.5" BDS, 5/8 MORE Booms, 1" BL, MML
AA SYE & CV,
35" Maxxis Bighorn
Smittybilt XRC8 Winch,
8.8 W/Elocker, D30 W/Aussie
Genright tube fenders
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Unread 12-17-2009, 01:27 PM   #86
MADMAX810
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I used hot glue to seal the new capacitors in the case.

Last edited by MADMAX810; 12-17-2009 at 01:28 PM.. Reason: clarification
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Unread 12-23-2009, 02:21 PM   #87
NHfireLJ
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What an easy money saving job...after reading the original thread, It too me less than 20 minutes and less than $6 for the repair....

BTW mine is a 4.0 94 YJ. I had 3 220uf caps..(no 470 uf caps)

Thank god for the web!!!!
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Unread 02-04-2010, 07:39 AM   #88
EdsJunk
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does anyone have the original pictures for this thread?? I may need to do this to my jeep.. thanks alot
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Unread 02-09-2010, 03:39 PM   #89
yjking
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anybody have this problem with a 2.5 89 yj?
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Unread 02-09-2010, 05:56 PM   #90
Ironworker709
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Read this thread and did it last weekend,starts everytime and runs smoother and in past few days even noticed better fuel mileage..thanks for the write up!..THIS is exactly why i love this forum
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