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Unread 09-06-2015, 01:18 PM   #1
300gearhead
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1990 YJ Wrangler 
 
Join Date: Dec 2012
Posts: 45
90 yj need help

I have 90 yj I did 4.0 swap on it everthing came from a 92 or 93 run fine for several months no having issues with running sometimes it starts an runs fine when it dies the fuel pump wont run an sometimes it wont crank so checked relays all good thought it might be ignition switch so replaced and still no crank or fuel pump wont come on an suggestions would be greatly appreciated thanks

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Unread 09-07-2015, 03:59 AM   #2
Jeepsr4me
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grounds check those
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Unread 09-08-2015, 07:07 AM   #3
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
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Did you hook up a check engine light? You said it doesn't crank, do you mean that the starter doesn't operate at all?
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Unread 09-09-2015, 12:57 PM   #4
300gearhead
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1990 YJ Wrangler 
 
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Starter dont work with key switch I can jump across it and works fine. I have checked grounds and still nothing I mean everything works on it but fuel pump and wont turn over
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Unread 09-09-2015, 01:09 PM   #5
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
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That sounds like an ignition switch issue. You need to check to see if the red wire is giving power to the ignition switch and if yo are getting the ignition run and ignition start power out.
http://www.jeepforum.com/forum/f12/9...lained-490788/

You need to figure out which harness you have in your dash.
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Unread 09-10-2015, 05:07 PM   #6
300gearhead
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1990 YJ Wrangler 
 
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Posts: 45
I checked my start relay and fuel pump relay when key is off only have one power source when I tutn key on or all way to crank I have two prongs that have power so im guessing that should mean I have power coming out of key switch right
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Unread 09-10-2015, 05:31 PM   #7
Que89YJ
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1989 YJ Wrangler 
 
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Yes. Did you measured by using ground from the chassis or across the relay for ground on the relay pins 85 and 86?
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Unread 09-11-2015, 09:50 AM   #8
300gearhead
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I just hooked test light to negative on battery post over to relays pin holes
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Unread 09-11-2015, 10:04 AM   #9
Que89YJ
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1989 YJ Wrangler 
 
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Location: Detroit, Michigan
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Pin 85 and 86 are control for the relay. 30/87 are power out.

On the relay recheck this time between 85/86 when you are trying to start
86 should be the ignition wire and 85 should be the neutral safety switch ground(Even if you don't have one)
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Unread 09-11-2015, 10:13 AM   #10
airconn
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1994 YJ Wrangler 
 
Join Date: Jun 2014
Location: Laughlin, Nevada
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Ok what a summer with this air cond, replaced the accumulator, replaced the high pressure switch on that, dropped the whole unit. whom ever put this in had everything all screwed up. had a guy who was a jeep mech for 25yrs help, everything back to spec. air is ice cold as long as the temp outside is not over 100-105 i live in southern nevada. once again, when it get's about 105 or so, while sitting in the lot, it short cycle's again. on 20 sec off 15 sec. oh also put a heavy duty fan in front of condenser, which is only 17X17. Guy who helped me suggested puting a biger condenser in and relocating it away from the front, mabey to the side under the hood. last night i had to turn it down, it was ice cold, and only cycled on and off as needed. also this has been one of the hottest aug in 20yrs. plus the monsoon moisture. so any suggestion's ? Please let me know what everyone think's. also last year put on a heavy duty fan clutch, and last week put on a new H Valve. still doing the same.

Thank You Airconn
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Unread 09-14-2015, 06:03 AM   #11
300gearhead
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That lats thread dont have Anything to do with the topic?
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Unread 09-14-2015, 07:11 AM   #12
Que89YJ
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1989 YJ Wrangler 
 
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Airconn you need to post up to a new thread of your own. You are way off topic and hijacking someone else's thread.
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