Delay in fuel pump relay when turn the key. .. Won't start til relay switches - JeepForum.com
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Unread 03-23-2010, 03:37 AM   #1
fisherman125
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1995 YJ Wrangler 
 
Join Date: Mar 2010
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Delay in fuel pump relay when turn the key. .. Won't start til relay switches

I turn the key and it won't start I have to wait til the relay switches before I have fuel pressure to start the jeep what the hell is happening?

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Unread 03-23-2010, 05:18 AM   #2
Que89YJ
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1989 YJ Wrangler 
 
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Location: Detroit, Michigan
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Normally the ASD relay pulls in the fuel pump relay when you turn the key. The fuel pump then pressurizes the fuel system to 38 PSI. It should take less than a second. How long is the delay from turning the key until your relay pulls the pump in?
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Unread 03-23-2010, 07:20 AM   #3
fisherman125
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This morning it took about 55 minutes yesterday only 10 minutes
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Unread 03-23-2010, 07:24 AM   #4
Que89YJ
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Sounds like you have the problem with the ECU caps. Does you Check engine light come on when you cycle the key to ignition on?
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Unread 03-23-2010, 07:31 AM   #5
fisherman125
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Only when I try to start it. No lights are on when the key is turned to the on postion. And by caps do you mean capacitors?
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Unread 03-23-2010, 07:42 AM   #6
Que89YJ
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1989 YJ Wrangler 
 
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Yes, in the FAQ it has a link on how to replace them. You have the classic case of the burned caps on the Engine controller.

Here is the link:

http://www.jeepforum.com/forum/f12/c...rs-ecu-492597/
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Unread 03-23-2010, 08:16 AM   #7
fisherman125
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Are you 100 percent sure that's the issue? How hard is it to do and would it be easier to get a new ecu? They're probably expensive tho
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Unread 03-23-2010, 08:47 AM   #8
Que89YJ
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1989 YJ Wrangler 
 
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You description of the problem is classic with the symptoms. The finally symptom is no Check engine light when you turn the key on. The ECU can be anywhere from $75 used to several hundred dollars rebuilt. Follow the directions. It is easy to do. It is an easy fix and the directions are very good in the writeup but you are the only person who knows arefter reading through it if you are capable of doing it. If you are going to have to pay to buy a new Engine Controller(PCM or ECU) anyways then why not spent the few dollars and give it a try. That is what this forum is about, helping you to get the info to get things done on your Jeep. There might be others in the area that might help and there are places you can ship your controller for repair as alternatives. I say go ahead and try it.
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Unread 03-23-2010, 10:12 AM   #9
fisherman125
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This is well within my capabilities I'm a mechanical technician for an aerospace engineering company. So thank you so much for your help this would be amazing I this fixes it
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Unread 03-23-2010, 10:37 AM   #10
Que89YJ
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1989 YJ Wrangler 
 
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Its a cakewalk for you then. Most of the new boards are 4mm and smaller and are all SMD the caps are through board and are easy. SASQUACHYJ did a great job posting the PCM repair. It has save thousands of dollars in PCM replacements. Post back and let us know how it goes.
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Unread 03-23-2010, 11:37 AM   #11
fisherman125
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Ok I called the electronics supply store and the x3 part confused her and also the w in the 35wvdc is it just a standard 220 uf 35vdc cap? She stocks those and can I do this in a night or is it a long process?
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Unread 03-23-2010, 11:43 AM   #12
idaholtby
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Quote:
Originally Posted by fisherman125 View Post
Ok I called the electronics supply store and the x3 part confused her and also the w in the 35wvdc is it just a standard 220 uf 35vdc cap? She stocks those and can I do this in a night or is it a long process?
X3 = 3 each
35VDC 220uf Electrolytic capacitors with radial leads. The voltage is not that important so long as it is rated the same or higher. Typically, caps are sized to be twice the voltage rating that they would see in the circuit. Pay attention to the polarity of the caps as they are removed. The new ones will need to be installed in the same orientation. The stripe on the side denotes the negative terminal.
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Unread 03-23-2010, 12:02 PM   #13
Que89YJ
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1989 YJ Wrangler 
 
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Yep, you can do it in a few hours and yep everything that was said about the cap. It is easy just remember its polarized and it needs to be soldered in the correct polarization.
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Unread 03-23-2010, 02:00 PM   #14
1 ton yj
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I've got a 95 YJ with the same issue. Anyone got a Radio Shack part # for these caps?
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Unread 03-23-2010, 04:01 PM   #15
fisherman125
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It worked perfectly!!! Fired on the first try and everytime since took about ab hour make sure when you buy the caps at radio shack that you but a fine tip soldering iron and a solder sucker oh and you don't need a part number they are a common cap 220 uf 35 vdc electrilitic radial leads
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