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Unread 12-28-2011, 11:09 PM   #151
patbe
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1992 YJ Wrangler 
 
Join Date: Dec 2011
Location: Shebandowan, Ontario, Canada
Posts: 4
After obtaining three 220 uf 35v capacitors and returning home and removing ecu and preparing for capacitor replacement I see that one of the capacitors is a taller 470 uf 25v. Has anyone run into this? Is it ok to use the 220 uf 35 volt or do I need to get a 470uf? Please and thanks.

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Unread 12-29-2011, 11:26 PM   #152
Domgia
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Hey,
I ran into the same thing while doing mine, I went to radio and picked up the 470
In my opinion I think it would be a bad idea to replace it with a 220
Goodluck
- Dom
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Unread 12-30-2011, 03:29 PM   #153
patbe
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1992 YJ Wrangler 
 
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Quote:
Originally Posted by Domgia View Post
Hey,
I ran into the same thing while doing mine, I went to radio and picked up the 470
In my opinion I think it would be a bad idea to replace it with a 220
Goodluck
- Dom
Ya, heres what I did. I tried replacing just the two 220uf capacitors, plugged it in to jeep...no go. So then I drove the 60 miles to town and picked up a 470uf and soldered it in. Hooked it up and...................success, fuel pump cycled and it fired right up. An awesome fix. Thanks to the original poster of this fix and contributers.
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Unread 12-31-2011, 02:05 PM   #154
Que89YJ
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1989 YJ Wrangler 
 
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Thew voltage was a bigger issue then the capacitance. Glad to hear it worked.
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Unread 01-04-2012, 08:27 PM   #155
rsegriggy
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Quote:
Originally Posted by Domgia View Post
Hey,
I ran into the same thing while doing mine, I went to radio and picked up the 470
In my opinion I think it would be a bad idea to replace it with a 220
Goodluck
- Dom
Do you have a 4.0 YJ? I found I have the 470 as well. Just curious as to why some have all 220 and some have a 470.
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Unread 01-05-2012, 05:15 AM   #156
Que89YJ
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1989 YJ Wrangler 
 
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470uF is a filter cap freq response that moved the effective reactance of the cap to the 1Mhz or the AM band. It's just a minimal change for the frequecy cutoff of the cap. The voltage is more important in the application it's being used.
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Unread 01-06-2012, 09:58 AM   #157
megagab
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1994 YJ Wrangler 
 
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Thank you very much for this guide!
I had the same problem, I followed your instructions and now my YJ 94 starts like a champ even at -25 C
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Unread 03-25-2012, 06:54 PM   #158
woodinrock
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1993 ZJ 
 
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This thread is very helpful. I have all the symptoms, followed sentinal02's link, everything is pointing at the ecu. Gonna give this a try as soon as I can make it to Radio Shack. I'll let you know how it goes, I'm doing this on a 93 zj.
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Unread 04-22-2012, 12:41 PM   #159
tomemt
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Just out of curiousity would this fix my problem no fuel pressure and replaced pump, filter and pressure regulator with no fuel pressure and only like 5 volts at the harness fuses and relay are good. No spark but have power to everything an it's all been replaced except ignition itself?!???
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Unread 04-22-2012, 08:37 PM   #160
Que89YJ
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Does your check engine light come on when you turn the key? If the light does not come on and go off when you cycle the key on then you have the ecu issue. If it does then your problem is something else.
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Unread 04-23-2012, 02:16 PM   #161
tomemt
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Just a note my '92 4.0 5spd had 2 220uf and 1 470uf so if your gonna do this buy a 470uf just in case and 3 220uf...it beats getting it all apart an having to go back to buy it cause yours has a 470uf
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Unread 04-26-2012, 05:25 PM   #162
skoz
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Capacitor!

I own a 93 grand Cherokee and have the problems with the chatter in the fuel pump/auto shut down relays. And after reading this original post i checked my PCM capacitors and clearly saw a bad cap. But the cap I have is a brown 220,uf 25v and after calling radio shack they only carry the 35v is this really ok to go up in size?
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Unread 04-26-2012, 06:39 PM   #163
Que89YJ
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in the right up it says that he used to 35dc cap.
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Unread 06-10-2012, 08:53 PM   #164
pooljunky
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Hey Guys, about this , Is it the exact same thing for a 2.5L 2001 wrangler?
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Unread 06-10-2012, 09:32 PM   #165
Que89YJ
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No. it is a totally different controller.
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