90 yj need help - JeepForum.com

 
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post #1 of 12 Old 09-06-2015, 12:18 PM Thread Starter
300gearhead
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1990 YJ Wrangler 
 
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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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post #2 of 12 Old 09-07-2015, 02:59 AM
Jeepsr4me
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grounds check those
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post #3 of 12 Old 09-08-2015, 06:07 AM
Que89YJ
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1989 YJ Wrangler 
 
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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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post #4 of 12 Old 09-09-2015, 11:57 AM Thread Starter
300gearhead
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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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post #5 of 12 Old 09-09-2015, 12:09 PM
Que89YJ
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1989 YJ Wrangler 
 
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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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post #6 of 12 Old 09-10-2015, 04:07 PM Thread Starter
300gearhead
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1990 YJ Wrangler 
 
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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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post #7 of 12 Old 09-10-2015, 04:31 PM
Que89YJ
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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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post #8 of 12 Old 09-11-2015, 08:50 AM Thread Starter
300gearhead
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1990 YJ Wrangler 
 
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I just hooked test light to negative on battery post over to relays pin holes
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post #9 of 12 Old 09-11-2015, 09:04 AM
Que89YJ
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1989 YJ Wrangler 
 
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Location: Detroit
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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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post #10 of 12 Old 09-11-2015, 09:13 AM
airconn
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1994 YJ Wrangler 
 
Join Date: Jun 2014
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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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post #11 of 12 Old 09-14-2015, 05:03 AM Thread Starter
300gearhead
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That lats thread dont have Anything to do with the topic?
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post #12 of 12 Old 09-14-2015, 06:11 AM
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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