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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 21 of 50
  1. Jul 29, 2006
    jayhawkclint

    jayhawkclint ΜΟΛΩΝ ΛΑΒΕ

    Oklahoma City, USA
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    Re: V6 Cutting out at cruising speeds?

    When you did the temp fuel can trick inbetween the front seats, did you use a different fuel line? Just to make sure that there isn't a collapsed/clogged line, can you run a piece of rubber hose from the pump to the tank (if the plugs don't fix it)?
     
    jayhawkclint, Jul 29, 2006
    #401
  2. Jul 29, 2006
    sparky

    sparky Sandgroper Staff Member Founder

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

    I did, bought new fuel hose, 10' of it, then I replaced all of it on the Jeep with it.
     
    sparky, Jul 29, 2006
    #402
  3. Jul 29, 2006
    sparky

    sparky Sandgroper Staff Member Founder

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

    Disconnected tach. No fix.
    Changed spark plugs to new ones. No fix.
    Swapped for a known good 2G that is running great on the Commando. No fix.
    Sprayed starting fluid all around the intake and carb base. No leaks.

    :cry:


    It seems to be less severe than before, but still lacks power in 3rd gear in general and then starts popping, huffing, and cutting out above 65 or so. Previously 55 mph was the high.

    Engine vacuum reads 18-19 inches at idle now. Previously was 14-15 before the cam swap.

    I have NO idea now what the heck it could be. I think I can safely rule out the carburetor, again. Spark plugs now have been swapped. Everything that I can change has been swapped out for new/different.
     
    sparky, Jul 29, 2006
    #403
  4. Jul 29, 2006
    tdobson

    tdobson Tom

    Hampton, Va.
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    65
    Re: V6 Cutting out at cruising speeds?

    I had the same thing happen with a Chrysler K-car way back when. Probably not the same cause but my problem was a weak air hose that fed air into the carb. It would collapse at mid rpm and starve the car for air. Like I said, probably not your problem.
     
    tdobson, Jul 29, 2006
    #404
  5. Jul 29, 2006
    sparky

    sparky Sandgroper Staff Member Founder

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

    Don't think it's starved for air with an open element air filter. R) :) Thanks though. At least it's a new idea, I'm running out.
     
    sparky, Jul 29, 2006
    #405
  6. Jul 29, 2006
    jayhawkclint

    jayhawkclint ΜΟΛΩΝ ΛΑΒΕ

    Oklahoma City, USA
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    Re: V6 Cutting out at cruising speeds?

    Was the fuel pump swapped?

    Have you tried running an open exhaust?
     
    jayhawkclint, Jul 29, 2006
    #406
  7. Jul 29, 2006
    sparky

    sparky Sandgroper Staff Member Founder

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

    Re: Fuel pump, new one was put in, yes somewhere along post 200+. R)
     
    sparky, Jul 29, 2006
    #407
  8. Jul 29, 2006
    tinker

    tinker GNGPN

    winnipeg,manitoba...
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    Re: V6 Cutting out at cruising speeds?

    Mine was cutting out at cruising speed after about 5 min .A new pump didn't fix it turns out that the cam the pump lever runs on was worn to far and couldn't keep up at highway speeds .A new holly fuel pump fixed it. Good luck .
     
    tinker, Jul 29, 2006
    #408
  9. Jul 29, 2006
    sparky

    sparky Sandgroper Staff Member Founder

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

    Fuel pump eccentric isn't worn, it's smooth, no groove in it.

    When you say a new Holley pump, you mean an electric pump? That might be worth a shot I supose.
     
    sparky, Jul 29, 2006
    #409
  10. Jul 29, 2006
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    Re: V6 Cutting out at cruising speeds?

    I just caught up on the latest, I am floored! Have you by chance checked for water in the fuel maybe? I imagine that's far fetched since your other vehicles apparently have had no problem?
     
    Glenn, Jul 29, 2006
    #410
  11. Jul 29, 2006
    jpflat2a

    jpflat2a what's that noise?

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

    one more try then I throw in the towel....... plug wires ?????
    swap out the dizzy again, points or HEI, doesn't matter
    it's possible to have had bad cam lifters/HEI acting up, both problems at the same time..
    now that the mechanical problems have been repaired, it's time to look somewhere else
    FWIW, my FLAPS rebuilt HEI had symptoms similar to what you describe, couldn't solve it and ditched it for a Delco and Pertronix
    that's if for me, can't think of anything else..
     
    jpflat2a, Jul 29, 2006
    #411
  12. Jul 29, 2006
    sparky

    sparky Sandgroper Staff Member Founder

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

    Just back in. Ran power to the coil directly from the alternator. Took it out. Same symptoms.

    Not sure I understand Jim. I went back and started rereading the whole thread. This whole problem started with a Delco points distributor. I have an HEI there now. Two distributors, two coils, two sets of plug wires, two sets of plugs, two sources of juice to the coil.

    Glenn, I thought about bad gas. Dunno, maybe? I put 10 gallons in yesterday. That should've diluted it, maybe that's why the symptoms are lessened and it's moved higher up in the speed where it starts?

    3rd gear just feels GUTLESS. 1 and 2 have plenty of power. 3 it just falls on it's face, I can punch it and it doesn't respond at all. Punch it in 1 or 2, any speed, it responds immediately. Punch it in 3 and it moseys up to 65 or so and starts chuffing.

    I'm just stumped.
     
    sparky, Jul 29, 2006
    #412
  13. Jul 29, 2006
    Rampdog

    Rampdog knuckle buster

    Sandy, Oregon
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    Re: V6 Cutting out at cruising speeds?

    Uhh, just catching up on the last few pages, so please forgive a buttinsky. I'd replace the vacuum line to the distributor. What I'm thinking is you have a small leak that won't show at low speeds, then it bleeds off just enough to give you a retarded spark. Not sure myself, but from what I did read, you have an electrical problem.
    Mike
     
    Rampdog, Jul 29, 2006
    #413
  14. Jul 29, 2006
    sparky

    sparky Sandgroper Staff Member Founder

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

    Sorry, I didn't mention that, I've used 2 vaccum lines too. Seriously! R)
     
    sparky, Jul 29, 2006
    #414
  15. Jul 29, 2006
    w3srl

    w3srl All-around swell dude Staff Member

    Port Orange, FL
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    Re: V6 Cutting out at cruising speeds?

    Just an idea Sparky, since we've exhausted just about everything else. Have you tried disconnecting the vacuum advance hosefrom the dist and plugging it to see if it makes any difference?

    And without going back through 42 pages of posts, have you tried a different carb anywhere along the way?
     
    w3srl, Jul 29, 2006
    #415
  16. Jul 29, 2006
    sparky

    sparky Sandgroper Staff Member Founder

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

    BTDT

    Look up! Posted today at 3:03 PM CDT. Should be on this page. R) I swapped a good 2G off Spoon's Commando this afternoon that I just rebuilt and tuned this AM. 2cnd time I've tried a different carb.
     
    sparky, Jul 29, 2006
    #416
  17. Jul 29, 2006
    w3srl

    w3srl All-around swell dude Staff Member

    Port Orange, FL
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    Re: V6 Cutting out at cruising speeds?

    How about advancing the crap out of the timing to see if that makes a difference?
     
    w3srl, Jul 29, 2006
    #417
  18. Jul 29, 2006
    sparky

    sparky Sandgroper Staff Member Founder

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

    I could. I think I tried advancing and retarding it before. Seems like it was worse at 10* advanced, so I backed it off to 5* after, got better but didn't go away.

    So I set it back to 5* before, I'm still fighting it.

    I'm gonna go out and run it in 2WD low in 3rd and see what happens...
     
    sparky, Jul 29, 2006
    #418
  19. Jul 29, 2006
    sparky

    sparky Sandgroper Staff Member Founder

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

    Dangit!

    I swapped the wheels and tires off the Commando onto the CJ-5. Does the same thing. So we put my engine in the Commando with my 33s on the Commando. Now the Commando acts funny.

    Must be wheels and tires?
     
    sparky, Jul 29, 2006
    #419
  20. Jul 29, 2006
    w3srl

    w3srl All-around swell dude Staff Member

    Port Orange, FL
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    Re: V6 Cutting out at cruising speeds?

    Funny man. Not. :mad:
     
    w3srl, Jul 29, 2006
    #420
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