YJ fuel issues after rebuild....help! - Page 2 - JeepForum.com
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post #16 of 48 Old 04-18-2013, 06:02 PM Thread Starter
jakethemuss
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I guess it might be time buy one. I tried to figure it out with jumpers. No luck.

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post #17 of 48 Old 04-19-2013, 08:06 AM
Que89YJ
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1989 YJ Wrangler 
 
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Vehicle harness connector wiring looking into the connector left to right:

Pin 1 Black/Orange - Ground
Pin 2 Dark Blue - Fuel level
Pin 3 Dark Green/Black - Power

Left to right looking at the connector

Here is a link to the on line Factory service manual:
http://www.jeep4x4center.com/knowled...ex.htm#service

And here are a couple threads:
http://www.jeepforum.com/forum/f12/a...oblem-1361262/
http://www.jeepforum.com/forum/f12/f...-wire-1320761/
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post #18 of 48 Old 04-26-2013, 01:46 PM Thread Starter
jakethemuss
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Ok. Wiring is handled. Now the issue. Pump runs but no fuel from outlet. I heard it spraying inside of the tank. Pulled the pump hatch and I really don't know what to look for. And should there be a gasket for the rectangle hatch?
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post #19 of 48 Old 05-24-2013, 04:22 PM Thread Starter
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Ok. Found the fuel problem. The bottom of the fuel pump snapped off. I get fuel and starts right up. But it's racing at high RPM. Could it be a throttle position sensor? I did remove the fuel rail to install new exhaust headers. Any ideas?
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post #20 of 48 Old 05-25-2013, 05:50 AM
Que89YJ
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1989 YJ Wrangler 
 
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iac or a vacuum leak. remember to disconnect the battery after messing with any sensor.
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post #21 of 48 Old 05-25-2013, 06:48 AM Thread Starter
jakethemuss
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What's the "iac"?
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post #22 of 48 Old 05-25-2013, 03:38 PM
Que89YJ
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1989 YJ Wrangler 
 
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idle air controller. search the forum for the writeup on cleaning it.
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post #23 of 48 Old 05-28-2013, 08:15 PM Thread Starter
jakethemuss
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Ok. I did a pretty thorough cleaning and rebuilt the vacuum lines coming out of the valve cover. Did a few minute battery reset. Still the same thing. Starts but idles at over 5000rpm. Kinda scary. The fuel pump issue was a broken pick up tube. Replaced new pump again and that problem solved.
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post #24 of 48 Old 05-28-2013, 09:20 PM
Que89YJ
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1989 YJ Wrangler 
 
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That is a stuck throttle. I don't think a vacuum leak or an iac issue is capable of going over 3000 rpm
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post #25 of 48 Old 06-01-2013, 06:38 AM Thread Starter
jakethemuss
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Cable seems to move freely. Is it just time for a new one? Or take it out and clean and use dry slide(graphite)?
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post #26 of 48 Old 06-01-2013, 08:05 AM
Que89YJ
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1989 YJ Wrangler 
 
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is the throttle plate fully closed in the throttle body?
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post #27 of 48 Old 06-01-2013, 08:16 AM Thread Starter
jakethemuss
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Looks like it. I cleaned it pretty good, no change
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post #28 of 48 Old 06-01-2013, 02:52 PM
Que89YJ
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and you are idling at 5000 rpms still ?
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post #29 of 48 Old 06-01-2013, 07:12 PM Thread Starter
jakethemuss
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Yup. In going to replace the the IAC motor and the TPS and try again. All original parts I'm replacing on a 114000mi YJ.
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post #30 of 48 Old 06-03-2013, 07:36 AM
Que89YJ
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1989 YJ Wrangler 
 
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Dont throw parts at it. Check the codes. 5000 should never be set by electronic control. No sensor failure will cause an idle that high. Not for any reason. If the throttleplate is closed you should not have enough air through the throttlebody to run it at that high of an idle. To do that you must have a huge vacuum leak and even then I dont know how it is possible. Put your hand in front of the throttlebody and see if it stalls. Are you 100% sure that plate is closed? You need to look around for a vacuum leak. It has to be a major one. Brake booster, PVC, etc.
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