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Need diagnostic help--engine

Discussion in 'Early CJ5 and CJ6 Tech' started by peter, Jul 4, 2011.

  1. Jul 4, 2011
    peter

    peter Member

    Roseville, CA.
    Joined:
    Aug 26, 2008
    Messages:
    161
    Jeep was running great all month. Leaving Friday for Rubicon weekend. This week had an issue pulling a grade at 50--lurching and sputtering and all I could do to keep it running. Even getting it going again was hard. 225 v6. Found a fuel line leak which I though would do the trick. Fixed the line and no change. Fuel filter is 1 year old as is the fuel pump. I can not tell if it is a carb issue. Fuel is getting there so I dont think it is the fuel pump. Or could it be a coil? I need help with next steps. I think fuel filter change just to rule it out and then maybe coil?? What would my next progression of checks be after that?
    Thank you for any input.

    Peter
     
    peter, Jul 4, 2011
    #1
  2. Jul 4, 2011
    Patrick

    Patrick Super Moderator Staff Member

    Los Alamos, NM
    Joined:
    Sep 22, 2002
    Messages:
    8,360
    I'd start with checking fuel volume judging by your symptoms..
     
    Patrick, Jul 4, 2011
    #2
  3. Jul 4, 2011
    Patrick

    Patrick Super Moderator Staff Member

    Los Alamos, NM
    Joined:
    Sep 22, 2002
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    8,360
    Any black smoke out the exhaust? Sharp miss, or bogging?
     
    Patrick, Jul 4, 2011
    #3
  4. Jul 4, 2011
    peter

    peter Member

    Roseville, CA.
    Joined:
    Aug 26, 2008
    Messages:
    161
    No smoke or backfire. Actually runs smooth at start up and low speeds and easy driving. Pulling a grade and sputter sputter. How do I check fuel volume??

    Peter
     
    peter, Jul 4, 2011
    #4
  5. Jul 4, 2011
    jpflat2a

    jpflat2a what's that noise?

    Hermosa, SD
    Joined:
    Jul 30, 2003
    Messages:
    8,526
    pull off the hose at carb (or pump), place into container, and start engine and let idle
    unrestricted, it should fill a pint container in no time
    I'd just blow thru the fuel filter first, easy way to check
     
    jpflat2a, Jul 4, 2011
    #5
  6. Jul 8, 2011
    cookieman

    cookieman Member

    Colton,Calif
    Joined:
    Jan 31, 2005
    Messages:
    302
    check the hose coming the gas tank for cracks that leting air in .From the tank to the pump it's air leak,from fuel pump to carb it a fuel leak that be seen.
     
    cookieman, Jul 8, 2011
    #6
  7. Jul 10, 2011
    Walt Couch

    Walt Couch sidehill Cordele, Ga. 2024 Sponsor 2023 Sponsor 2022 Sponsor

    cordele, Ga.
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    Mar 29, 2007
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    Could also be the vacuum advance circuit.
     
    Walt Couch, Jul 10, 2011
    #7
  8. Jul 10, 2011
    wheelie

    wheelie beeg dummy 2024 Sponsor 2023 Sponsor

    York, PA
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    Mar 6, 2004
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    4,521
    I was thinking accelerator pump but, ehh, I'm not real good at this diagnosis thing.
     
    wheelie, Jul 10, 2011
    #8
  9. Jul 10, 2011
    jasonjp62

    jasonjp62 Member

    Pennsboro WV.
    Joined:
    Aug 15, 2009
    Messages:
    799
    fuel line/filter/fuel pressure
     
    jasonjp62, Jul 10, 2011
    #9
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