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YJ won’t start

Discussion in 'Wrangler YJ (1986-1995)' started by DylanJ, Jun 18, 2021.

  1. Jun 18, 2021 at 7:15 PM
    #1
    DylanJ

    #1
    DylanJ [OP] New Member

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    Dylan
    Vehicle:
    1991 Jeep Wrangler YJ 4.0 6 cylinder
    So I bought a 1991 Yj a few months back ran great for a month or two then one day wouldn’t start. I banged on the starter and she started right up. So I replaced the starter everything was good for a few weeks then I started noticing the engine was puttering out when I took turns or was on bumpy terrain. I replaced the fuel pump and fuel tank and then it would turn over when I tried to start it. Thought maybe received a bad fuel pump so I returned it and got a new one but still had the same issue. I replaced the fuel filter and nothing changed. It will crank but just won’t start. Any ideas? Also when I spray starter fluid in the intake it starts for a second and then shuts off.
     
    Last edited: Jun 18, 2021
    DylanJ, Jun 18, 2021
    #1
  2. Jun 19, 2021 at 12:17 AM
    #2
    Little red 91

    #2
    Little red 91 New Member

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    Michael
    Pleasant hill Oregon
    Vehicle:
    1991 red yj
    4"lift ,axle swap,duel battery box,inverter, under hood compressor
    Are you getting spark for the coil.
     
    Little red 91, Jun 19, 2021
    #2
  3. Jun 21, 2021 at 10:46 AM
    #3
    Jim Sahm

    #3
    Jim Sahm New Member

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    98 TJ - 89 YJ - 84 CJ
    Check the fuel rail regulator... Even thought the pump is ok, the regulator can be off and not get enough fuel to the injectors.

    It's this part:
    https://www.rockauto.com/en/moreinfo.php?pk=47058&cc=1185005&pt=6124&jsn=847

    -Jim
     
    Last edited: Jun 21, 2021
    Jim Sahm, Jun 21, 2021
    #3
  4. Jun 21, 2021 at 5:35 PM
    #4
    DylanJ

    #4
    DylanJ [OP] New Member

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    Dylan
    Vehicle:
    1991 Jeep Wrangler YJ 4.0 6 cylinder
    Okay just checked spark not getting any spark so I changed my ignition coil and still nothing
     
    DylanJ, Jun 21, 2021
    #4
  5. Jun 21, 2021 at 5:36 PM
    #5
    DylanJ

    #5
    DylanJ [OP] New Member

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    Dylan
    Vehicle:
    1991 Jeep Wrangler YJ 4.0 6 cylinder
    I’ll look into the fuel pressure regulator
     
    DylanJ, Jun 21, 2021
    #5
  6. Jul 2, 2021 at 10:49 AM
    #6
    Johnsjeep91w

    #6
    Johnsjeep91w New Member

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    John
    Vehicle:
    91 jeepYJ
    None , original
    I have the same problem , yes I have 12.6volts . It will occasionally start but will suddenly die & will not start ! This is not my 91 Jeep YJ , it is a customers and I want it to Freakin run ! It’s a brain teaser !
    New fuel pump fuel filter was previously installed ! The wiring is a mess but that was not the prob, it ran good regardless !
     
    Johnsjeep91w, Jul 2, 2021
    #6
  7. Jul 4, 2021 at 5:24 AM
    #7
    Justanotherjeeper

    #7
    Justanotherjeeper Well-Known Member

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    Peter
    Vehicle:
    2011 Red Wrangler 2 door
    paid cash for it.
    Might be a ground problem. @Johnsjeep91w , diagnosing problems as a pro is different for sure, because you may not know the vehicle history. For example, don’t assume new parts are installed correctly. Lol.
     
    Justanotherjeeper, Jul 4, 2021
    #7
    aggrex likes this.
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