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Won't keep running??

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  • Won't keep running??

    My Yj will not stay running after it warms up and the idle kicks down. It starts up fine and runs fine until I kick the idle down; under 1200 to 1500rpm it just dies. I had the carb rebuilt; installed a new fuel filter; new air filter; it just won't keep running. I bought it a couple of months ago and the guy told me it had been sitting for several years. I put 10 gallons of fresh premium gas in the tank and fuel conditioner but so far no luck. It is really aggravating since it runs so smooth when I first start it. Any suggestions would be appreciated, Thanks!
    88 YJ, 4.2L, 5SPD, Black; under construction!

  • #2
    i've had similar problems and never fully resolved them. im curious to see what people think as well
    90 yj 4.2L 31s the rest i have no idea

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    • #3
      So did you have the problem before the rebuild? If you did not I would take it back to where that was done. It has been awhile and I have had so many problems with mine but I think mine did that and I had to get the carb adjusted and I also got a new choke for it. Have not had that issue anymore.
      88yj, 4" lift, 6cyl, 6000lb winch, KC Daylighters. Not that great looking but it gets the job done!!

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      • #4
        Yes I had the same problem before the rebuild; I was hoping the rebuild was going to take care of it but it did not! I just bought a parts Jeep that has a fairly new Motorcraft carb.; thought maybe I would swap the carbs and see if it helps but I still think something else is the problem???
        88 YJ, 4.2L, 5SPD, Black; under construction!

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        • #5
          is there a egr valve sounds like that could be messed up..
          just my 3 cents.........
          GOD CREATED FIREFIGHTERS SO POLICE WOULD HAVE HEROES TOO!!!!!!!

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          • #6
            It also could be a vacuum leak, I think.... I could be wrong who knows??
            Its a Jeep Thing, You Wouldn't Understand! It's Not What Your Country Can Do for You, It's What You Can Do for Your Country!!The Only Thing We Have To Fear, Is Fear It's Self! Three of my Favorite quotes Right there

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            • #7
              still have the stock carter carb? i could never get that crap to run right....swap in a MC 2100 it will run better/better fuel economy-for a carb
              1997XJ(DD) Wheeler=1990 YJ 3.5 BDS rear add-a-leaf 5/8 shackles 1 body 33x12.5 TrXus MT
              4.0 I6 (1994 XJ) AX15 (1992 XJ)- NP231 ('01 TJ) AA SYE - frame (1994yj 2.5)
              AtoZ rockers TKH bumpers front&rear -4.56-Ford 9" currie high pinion 3d member ARB 35spline alloy shafs, D44 (-posi) OBA (210R) 8274

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              • #8
                If I swap in the Motorcraft carb from my 87 parts Jeep can I disconnect all of the emissions crap? My 88 is registered Historic so it does not require any safety or emissions inspections.
                88 YJ, 4.2L, 5SPD, Black; under construction!

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                • #9
                  I think an 88 does still have an egr valve and I would agree with Chris G.. Just pull the vacuum line off it and plug the vacuum line. And see if it makes a difference . If it doesn't try the Motorcraft carb. It's a good swap anyway.
                  <<<<Thats my first Jeep 73 CJ-5
                  Current Jeeps 97 Wrangler Sport, 01 WJ

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