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Fixed: V6 Cutting out at cruising speeds?

Discussion in 'Early CJ5 and CJ6 Tech' started by sparky, May 14, 2006.

Page 17 of 50
  1. Jul 28, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    Re: V6 Cutting out at cruising speeds?

    No MSD, no ballast resistor, using my HEI. New cap, rotor, wires, etc. Before I go replacing more on it, the module will be replaced with the MSD and it acted exactly the same way with the points distributor.

    I've double, triple, quadruple checked the hot wire, it's getting a full 12-14V.
     
    sparky, Jul 28, 2006
    #321
  2. Jul 28, 2006
    termin8ed

    termin8ed I didn't do it Staff Member

    Mason, MI
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    Re: V6 Cutting out at cruising speeds?

    when the jeep is moving in 3rd gear, it has a LARGE load on it. MORE gas, MORE air, MORE electrical power.

    It may be sucking gas out of the tank fast enough in 3rd gear and in 2nd it doesn't have enough suction to pull whatever it is blocking the way.

    Same with the airflow into the carb. ALOT of air goes into the carb under load in 3rd gear.

    hoping that makes more sence.
     
    termin8ed, Jul 28, 2006
    #322
  3. Jul 28, 2006
    blevisay

    blevisay Oh Noooooooooooooooo! Staff Member

    Portland Tn.
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    Re: V6 Cutting out at cruising speeds?


    coincidence
     
    blevisay, Jul 28, 2006
    #323
  4. Jul 28, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    Re: V6 Cutting out at cruising speeds?

    Could be water in the tank I guess? Nothing showing up in the filter as a foreign body, no particles or anything. Tank's new MTS poly. But why would it run fine for two test runs and then only start showing up after a couple miles? Water should sit on the bottom all the time shouldn't it?

    I mean, if there is water mixed in with it, as you said it takes MORE gas and MORE air so maybe there's not enough gas if there's water in it to run in 3rd? :grasping:
     
    sparky, Jul 28, 2006
    #324
  5. Jul 28, 2006
    Mudweiserjeep

    Mudweiserjeep JEEP: Bouncy and Fun

    tipp city, ohio
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    Re: V6 Cutting out at cruising speeds?

    Just a wild stab..............is the gas tank vented right? If the jeep starts cutting out......take the gas cap off.....does it have a vacume?
     
    Mudweiserjeep, Jul 28, 2006
    #325
  6. Jul 28, 2006
    Alexis

    Alexis

    Re: V6 Cutting out at cruising speeds?

    adam when did you replace the gas tank in relation to all of this? didn't you say one of the vents was leaking gas this morning at the station? you tightened it down some????
     
    Alexis, Jul 28, 2006
    #326
  7. Jul 28, 2006
    blevisay

    blevisay Oh Noooooooooooooooo! Staff Member

    Portland Tn.
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    Re: V6 Cutting out at cruising speeds?

    Whoo Hoo Sparky........

    Think about this I found


    AND THERE IT WAS. The aftermarket polyethylene gas tank fuel line inside the tank is 1/4-inch brass pipe. But the connector to the fuel line was narrower. YES THAT WAS THE ISSUE -- it was fuel starvation. Not enough fuel was entering the carb to run under load, and the engine ran out of fuel. Once I opened up the connector to about 1/4-in. the Jeep came alive and has been running ever since.
     
    blevisay, Jul 28, 2006
    #327
  8. Jul 28, 2006
    jpflat2a

    jpflat2a what's that noise?

    Hermosa, SD
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    Re: V6 Cutting out at cruising speeds?

    go stick another set of plugs in it
    they could be breaking down under load
     
    jpflat2a, Jul 28, 2006
    #328
  9. Jul 28, 2006
    jd7

    jd7 Sponsor

    Nacogdoches,Texas
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    Re: V6 Cutting out at cruising speeds?

    Been following this and sounds like a coil braking down. I know you're getting a lot of advise here but I think that I would take it back to basics once again. That being points type distributor, known good or new points,new condenser, a known good or new rotor. Also a new ballast resistor and a known good coil or new. It really sounds to me like your coil is breaking down. I've been following this now and that's really where I think I'd concentrate until I was dead sure otherwise. The only other think that I can think about would be it creating a vacuume in the tank from some blockage have you run it witout gas tank cap and see? Anyway I hope you get it solved soon, cause I know how a problem like this can ruin an otherwise fun project. good luck.:beer:
     
    jd7, Jul 28, 2006
    #329
  10. Jul 28, 2006
    termin8ed

    termin8ed I didn't do it Staff Member

    Mason, MI
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    Re: V6 Cutting out at cruising speeds?

    What Mudwieser said...

    Another thing to do is disconnect the gas line either at the bottom of the tank or where it goes into the fuel pump. See how it drains out. If gas pours out, probably nothing stuck in the way. If it "gulps" then you might have a venting problem. if its really slow or fast and then slow, might be something getting in the way blocking things.


    You didn't by any chance use RTV to seal anything on the tank did you??
    ask me how I know that one:rofl: rtv doesn't like gas.
     
    termin8ed, Jul 28, 2006
    #330
  11. Jul 28, 2006
    Alexis

    Alexis

    Re: V6 Cutting out at cruising speeds?


    this is very interesting billy. i'm sure we will be looking into this one. and if this is the case you will probably be getting a case (of beer) in the mail!!!
     
    Alexis, Jul 28, 2006
    #331
  12. Jul 28, 2006
    jpflat2a

    jpflat2a what's that noise?

    Hermosa, SD
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    Re: V6 Cutting out at cruising speeds?


    have you been sitting on this info till now ?
    I thought Sparky tried the boat tank trick already
     
    jpflat2a, Jul 28, 2006
    #332
  13. Jul 28, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    Re: V6 Cutting out at cruising speeds?

    Billy and Tim, I'll look into those things for sure.

    Brian, no RTV, I just put the tank in.

    David, for the 5th time this AM, it's HEI. ;)
     
    sparky, Jul 28, 2006
    #333
  14. Jul 28, 2006
    jpflat2a

    jpflat2a what's that noise?

    Hermosa, SD
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    Re: V6 Cutting out at cruising speeds?

    Dad and his companion are leaving on the 22 of Aug for a 29 state trip, want me to have him swing by ? he will be in Kansas...
     
    jpflat2a, Jul 28, 2006
    #334
  15. Jul 28, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    Re: V6 Cutting out at cruising speeds?

    Oh, yeah, yeah I did, set the gas can between me and Spoon and went for a drive. So that rules out the gas tank and the gas tank not venting. :rofl:

    There was plenty of vent with a 3/8" hose in a 2" hole...
     
    sparky, Jul 28, 2006
    #335
  16. Jul 28, 2006
    blevisay

    blevisay Oh Noooooooooooooooo! Staff Member

    Portland Tn.
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    Re: V6 Cutting out at cruising speeds?


    When Sparky said poly tank it jogged my memory of seeing a similar problem on the 3 b site.

    to answer the 3 gear thing.......you are spending more time in third Then 1 or 2.......makes sense to me!!!!



    HI LEX!
     
    blevisay, Jul 28, 2006
    #336
  17. Jul 28, 2006
    blevisay

    blevisay Oh Noooooooooooooooo! Staff Member

    Portland Tn.
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    Re: V6 Cutting out at cruising speeds?

    Sparky

    do me a favor and look at the hot wire that goes to the coil / hei......follow it from the ign switch forward and look for pinching / insulation rubbed off ect.
     
    blevisay, Jul 28, 2006
    #337
  18. Jul 28, 2006
    blevisay

    blevisay Oh Noooooooooooooooo! Staff Member

    Portland Tn.
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    Re: V6 Cutting out at cruising speeds?

    You know.

    are you running a tach?
     
    blevisay, Jul 28, 2006
    #338
  19. Jul 28, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    Re: V6 Cutting out at cruising speeds?

    Yes
     
    sparky, Jul 28, 2006
    #339
  20. Jul 28, 2006
    jd7

    jd7 Sponsor

    Nacogdoches,Texas
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    Re: V6 Cutting out at cruising speeds?

    I know, my suggestion was pertaining to replacing it to troubleshoot. But in light of the gas tank's development it may just be a a mute point anyway. good luck.;)
     
    jd7, Jul 28, 2006
    #340
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