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Starting Issues

Discussion in 'Wrangler YJ (1986-1995)' started by Eifer29, Dec 8, 2020.

  1. Dec 8, 2020 at 9:56 AM
    #1
    Eifer29

    #1
    Eifer29 [OP] New Member

    Joined:
    Dec 8, 2020
    Member:
    #5297
    Messages:
    1
    Vehicle:
    1991 Wrangler Sport
    I picked up a '91 4.0 and I've been having a problem getting it started - if it sits for a few hours (or over night) without starting, it takes quote some time to get it going. It's like its losing pressure somewhere. One trick I've figured out is to leave the key in the run position for a few minutes until I hear a ticking noise, that starts faint and then gets louder and louder and when it stops ticking i can start it. It doesn't always do this on the first try but after a few times of leaving the key in the run position it will work.

    Any ideas what the issue could be? Bad injector? Fuel pump?

    Jeep.jpg
     
    Eifer29, Dec 8, 2020
    #1
  2. Dec 8, 2020 at 10:07 AM
    #2
    aggrex

    #2
    aggrex Well-Known Member

    Joined:
    Sep 12, 2016
    Member:
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    Messages:
    4,840
    DE
    Vehicle:
    Backcountry '16
    Tuffy>AEV>TTO>JW>STech>EVOcage>MagnaFlow>SpiderTrax>RockHard>TF>SpringTail>67design>Bolt>GPCA>Curt>
    Welcome @Eifer29 ... too nice of a YJ to leave on the side of the road. Check fuel pump pressure and/or filter.
     
    aggrex, Dec 8, 2020
    #2
  3. Dec 8, 2020 at 10:26 AM
    #3
    Prerunner1982

    #3
    Prerunner1982 Well-Known Member

    Joined:
    Aug 4, 2017
    Member:
    #1745
    Messages:
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    Gender:
    Male
    First Name:
    Jon
    Vehicle:
    93 XJ 2 door
    Sounds like the drain back valve is busted unfortunately I can't recall where the valve is located, in the regulator or the pump or both.
    It could be a leaky injector draining the fuel in the rail as it sits, might be worth pulling them out and testing them.
     
    Prerunner1982, Dec 8, 2020
    #3
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