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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 6 of 50
  1. May 18, 2006
    sparky

    sparky Sandgroper Staff Member Founder

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

    I already dropped the pan just to find out. It's an odd fire crank.

    The vacuum line is new Sean, it does it with it attached and unattached/blocked.

    This has done it with two distributors installed a couple different directions to get the vacuum advance to clear. I doubt that it's timing being off, it's set to 5* before, static, with 30* total advance.

    Bought a vacuum gauge today, and I'll check the fuel pump tonite as well.
     
    sparky, May 18, 2006
    #101
  2. May 18, 2006
    Jeepsterman

    Jeepsterman I had a beer with Panzer.

    Southgate, MI
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    Sep 23, 2002
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    90
    Re: V6 Cutting out at cruising speeds?

    I remember you saying that now. I was thinking fuel pump somehow too. I have a new one I could ship out to you if you want to try it. It is the one of my motor that you put on.
     
    Jeepsterman, May 18, 2006
    #102
  3. May 18, 2006
    sparky

    sparky Sandgroper Staff Member Founder

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

    MOP has one that's much closer. ;) Thanks anyway!
     
    sparky, May 18, 2006
    #103
  4. May 19, 2006
    w3srl

    w3srl All-around swell dude Staff Member

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

    I'ts a long drive from Kansas to Windrock. Better get crackin' there young man! R) R)
     
    w3srl, May 19, 2006
    #104
  5. May 19, 2006
    sparky

    sparky Sandgroper Staff Member Founder

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

    Even longer drive at 50 mph. :rofl:

    Patrick told me to just drop a Briggs and Stratton in it, said it'd still be faster than Billy's Jeep. R)
     
    sparky, May 19, 2006
    #105
  6. May 19, 2006
    Glenn

    Glenn Kinda grumpy old man Staff Member

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

    :evil: :hurrican:
     
    Glenn, May 19, 2006
    #106
  7. May 19, 2006
    vanguard

    vanguard

    Re: V6 Cutting out at cruising speeds?

    Thanks. Now I have coffee burns in my nose. R)
     
    vanguard, May 19, 2006
    #107
  8. May 19, 2006
    Rondog

    Rondog just hangin' out

    Parker, CO
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    Aug 25, 2005
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    Re: V6 Cutting out at cruising speeds?

    I haven't read the whole thread, and this might sound ridiculous, but have you tried new spark plugs? I had a maddening problem with my old Chevy truck, and I put a bunch of time and money in it working on it and replacing parts, and it turned out it was just the plugs. I didn't consider them because they weren't very old to begin with.

    First time I trailered my Harley from New York to Florida for Bike Week it wouldn't run after we got there. Same thing then, bad plugs. Ran fine in Syracuse, took it off the trailer in Daytona and no-go. Saw it happen on a lot of other bikes there from up north too, who knows why.
     
    Rondog, May 19, 2006
    #108
  9. May 19, 2006
    Toolmaker

    Toolmaker Member

    Westminster, SC
    Joined:
    Oct 3, 2005
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    Re: V6 Cutting out at cruising speeds?

    If it is backfiring through the carb, then it sounds like you are already running lean. The adjustment screws only effect idle and low speed mixture. Once the throttle is opened more than about 1/4 to 1/3 then you start getting into the main circut. Is it possible that the PO changed the main jets in an attempt to make the OF engine run with an EF HEI distributor? Another thing I would check is the power valve. Assuming you are running a 2G Rochester, be sure the power valve piston assembly (the rod with a spring around it) will move freely up and down and the spring has some tension on it. If the power valve is not opening correctly you will be lean under low vacuum conditions.

    Although I don't think the adjusting screws are your problem, the vacuum guage you just bought will work great for setting the low speed screws on your carb too. IMO much easier than setting them by ear.
     
    Toolmaker, May 19, 2006
    #109
  10. May 21, 2006
    sparky

    sparky Sandgroper Staff Member Founder

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

    Carb is rebuilt, adjustment screws have been too rich before and are now too after the rebuild. I didn't adjust 'em after that.

    Rondog, I did think of that, I think I mentioned it too, I put new spark plugs in it just before this started.
     
    sparky, May 21, 2006
    #110
  11. May 21, 2006
    Rondog

    Rondog just hangin' out

    Parker, CO
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    Re: V6 Cutting out at cruising speeds?

    It was just a WAG, Sparky. Like I said, I haven't read the whole thread, there's 110 posts here and I'm too lazy for that. I wouldn't rule out changing them again, plugs are quick and cheap. Sure makes me feel sheepish when a problem turns out to just be spark plugs, even new ones go bad or are bad out of the box.
     
    Rondog, May 21, 2006
    #111
  12. May 21, 2006
    termin8ed

    termin8ed I didn't do it Staff Member

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

    CHeck the exhaust yet?
     
    termin8ed, May 21, 2006
    #112
  13. May 23, 2006
    Rondog

    Rondog just hangin' out

    Parker, CO
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    Re: V6 Cutting out at cruising speeds?

    Get it figured out yet Sparky?
     
    Rondog, May 23, 2006
    #113
  14. May 23, 2006
    sparky

    sparky Sandgroper Staff Member Founder

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

    Nope, when I do I'll post it. :)
     
    sparky, May 23, 2006
    #114
  15. May 27, 2006
    sparky

    sparky Sandgroper Staff Member Founder

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

    Not the timing chain.

    Checking the fuel pump more closely now.
     
    sparky, May 27, 2006
    #115
  16. May 27, 2006
    sparky

    sparky Sandgroper Staff Member Founder

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

    Continuing to follow this saga?

    Fuel pump checks out good. Plenty of pressure, 3.5 PSI with the return line hooked up, that over 1 lb. more than the min.

    Ok, checking compression now.

    2- 115, 4- 125, 6- 0, 1- 130, 3- 125, 5- 125

    Hmm. It bounces around on cylinder 6, going up to 125 or so. Makes me think lifter? Valve? Rings are ok if it hits that I'd think.

    Going to get some MMO now...
     
    sparky, May 27, 2006
    #116
  17. May 27, 2006
    mb82

    mb82 I feel great!

    Charlottesville Va
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    Re: V6 Cutting out at cruising speeds?

    Hmm that #6 cylinder interests me. Well I am not the one to ask about this stuff so I am going to go back to just watching this thread.
     
    mb82, May 27, 2006
    #117
  18. May 27, 2006
    jpflat2a

    jpflat2a what's that noise?

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

    bent rod ?
    :D
     
    jpflat2a, May 27, 2006
    #118
  19. May 27, 2006
    sparky

    sparky Sandgroper Staff Member Founder

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

    Oh, and the plug in #6 is clean, so that also makes me think it's valve/lifter along with the fact that I knew I have something bad with an exhaust valve on that bank...

    Hope it's not a bent rod Jim! :shock: ;)
     
    sparky, May 27, 2006
    #119
  20. May 27, 2006
    Glenn

    Glenn Kinda grumpy old man Staff Member

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

    #6 goes ranges between 0 and 125 psi? I'd pull the valve cover and watch the valve train action.
     
    Glenn, May 27, 2006
    #120
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