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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 22 of 50
  1. Jul 29, 2006
    w3srl

    w3srl All-around swell dude Staff Member

    Port Orange, FL
    Joined:
    Nov 6, 2002
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    4,275
    Re: V6 Cutting out at cruising speeds?

    I've got it: Put an OD in it and use it instead of third gear.... R) R) R)
     
    w3srl, Jul 29, 2006
    #421
  2. Jul 29, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
    Joined:
    Sep 20, 2002
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    Re: V6 Cutting out at cruising speeds?

    Well, not the air filter. Drove without one, no dice.

    Not 3rd gear. Least not in low range. I came through town sounding like I was going 100 mph in 3 low. R)
     
    sparky, Jul 29, 2006
    #422
  3. Jul 29, 2006
    BlueFlu

    BlueFlu past owner of some ecj5's

    Hermitage, TN
    Joined:
    Jan 21, 2004
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    1,552
    Re: V6 Cutting out at cruising speeds?

    Man Sparky I'm stumped.
    So the starting fluid turned up nada. Thats a good sign.

    I really am starting to wonder about the carb size/fuel flow on the engine. We had a race Hemi that would run great till the top end of the track and it would just fall flat on its face. Now this was a tunnel ram with two Carter AFBs but it was a carb issue. One of them wasn't dumping enough fuel. I know you swapped carbs and all, so that leaves us with two more ideas options. Higher volume fuel pump (elec) or a 4 barrel carb/intake.

    Other than that all I can think of is cam timing.
    After that I be banging my head in the corner. R)
     
    BlueFlu, Jul 29, 2006
    #423
  4. Jul 29, 2006
    w3srl

    w3srl All-around swell dude Staff Member

    Port Orange, FL
    Joined:
    Nov 6, 2002
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    4,275
    Re: V6 Cutting out at cruising speeds?

    Ok, so it's definitely load-related then.

    Recap the symptoms please, is it just cutting out entirely in third under heavy load, or just missing/popping through the carb then?

    Can you "baby" the throttle to get the Jeep past the "cut-out" point as opposed to mashing it to the firewall?
     
    w3srl, Jul 29, 2006
    #424
  5. Jul 29, 2006
    Rampdog

    Rampdog knuckle buster

    Sandy, Oregon
    Joined:
    Mar 27, 2006
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    105
    Re: V6 Cutting out at cruising speeds?

    Well, rats! Great big ones too.
    Not being there sux, so here's another head scratching guess. Check all of the manifold air fittings for tightness. You could pull all of them and use teflon tape on the threads which will help seal them. What I'm thinking is a very tiny air leak the kind that can't be heard, or sprayed with ether.

    If you have a vacuum gage that you could hook in and then drive it, see what happens???
     
    Rampdog, Jul 29, 2006
    #425
  6. Jul 29, 2006
    beeser

    beeser Member

    Arizona
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    Jan 8, 2003
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    587
    Re: V6 Cutting out at cruising speeds?

    Just curious, and I have no basis for this yet, but have you tried placing an additional load on the engine in 2nd gear by applying some braking force? Try matching the same rpms where you run into trouble in 3rd gear.
     
    beeser, Jul 29, 2006
    #426
  7. Jul 29, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
    Joined:
    Sep 20, 2002
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    Re: V6 Cutting out at cruising speeds?

    Tried matching RPM in 3rd by putting it in low range. That didn't have any effect, 3rd gear felt great!

    Lugged it up a couple hills at idle in 3rd in high range, idled right up. Warloch was right, it's a torquey cam right off idle.

    Humm. I dropped the mufflers and ran open headers. Need new gaskets now. R)

    Ok, so it seemed better this time. This time w/o the mufflers we crested a hill that previously had started causing issues prior to getting to the top. Then it didn't chuff through the carb. Felt more like a miss than a chuff.

    Can't go "past" it. It starts in and you have to back off. Just missing and popping, not cutting out entirely.

    Thought about cam timing. It is installed straight up. The stock one was as well.
     
    sparky, Jul 29, 2006
    #427
  8. Jul 29, 2006
    beeser

    beeser Member

    Arizona
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    Re: V6 Cutting out at cruising speeds?

    Sparky - I'm not sure we're talking about the same thing. What I was trying to recreate in the suggested scenario was a similar load on the engine when the problem begins in 3rd gear by instead using 2nd gear and applying some braking force. I guess all I'm trying to rule out is something else happening in the drivetrain that is only showing up at higher speeds in 3rd gear. Just a thought.
     
    beeser, Jul 29, 2006
    #428
  9. Jul 29, 2006
    sparky

    sparky Sandgroper Staff Member Founder

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

    I was trying to rule out something happening in the drive train in 3rd by putting it in low range too to rule out 3rd gear itself.
     
    sparky, Jul 29, 2006
    #429
  10. Jul 29, 2006
    neptco19

    neptco19 That guy....

    Athens, GA
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    Sep 26, 2003
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    1,381
    Re: V6 Cutting out at cruising speeds?

    Just dont go faster than 65 and that should solve the problem :beer:

    Wish I could help some but when I actually had a :v6:, mine did this and I just had to do a 4.3 swap to cure it.....


    Except mine was 2nd gear :oops:

    http://www.earlycj5.com/forums/showthread.php?t=4364
     
    neptco19, Jul 29, 2006
    #430
  11. Jul 29, 2006
    jhuey

    jhuey Michigan Jeeper!

    Indian River...
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    Apr 9, 2004
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    Re: V6 Cutting out at cruising speeds?

    I'm sorry If I keep going back to fuel, but I can't help it! While it is chugging does rapid pumping of the accelerator help it (not to the floor just slight jabs/almost fluttering), I know it will jerk, but does the chugging diminish? As with everyone else I'm bordering on stumped with the problem you have. This issue has really tested our collective knowledge and even with all we know we still haven't helped you, that is really amazing! Don't give up!!
     
    jhuey, Jul 29, 2006
    #431
  12. Jul 29, 2006
    beeser

    beeser Member

    Arizona
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    Re: V6 Cutting out at cruising speeds?

    Again, not necessarily 3rd gear itself but the load placed on the engine at the troubled rpm. Putting the transfer case in low range doesn't increase the load, it reduces it.
     
    beeser, Jul 29, 2006
    #432
  13. Jul 29, 2006
    jpflat2a

    jpflat2a what's that noise?

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

    kind of like "power braking" Steve ?
    if the mufflers are still off, can you take a flashlight and look up into the collectors and make sure that all the individual tubes are open, not blocked by anything
     
    jpflat2a, Jul 29, 2006
    #433
  14. Jul 29, 2006
    jpflat2a

    jpflat2a what's that noise?

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

    this thread and problem keeps drawing me back like a bug to a light at night.......
     
    jpflat2a, Jul 29, 2006
    #434
  15. Jul 29, 2006
    beeser

    beeser Member

    Arizona
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    Re: V6 Cutting out at cruising speeds?

    Yep, should be able to simulate the same load conditions at the same rpms in 2nd gear. If the results (caughing, backfiring, etc.) are the same as what happens in 3rd gear at higher speeds then you can probably completely rule out other drivetrain problems and you're right back looking at only the engine. If not, what's not to say that some problems do exist elsewhere in the drivetrain that only show up at higher speeds?
     
    beeser, Jul 29, 2006
    #435
  16. Jul 29, 2006
    sparky

    sparky Sandgroper Staff Member Founder

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

    I see what you're saying now.

    I'll check the collectors, mufflers are still off.
     
    sparky, Jul 29, 2006
    #436
  17. Jul 29, 2006
    sparky

    sparky Sandgroper Staff Member Founder

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

    Good question, I don't know. I've not tried that. Enough working on it for tonite. I'm gonna eat supper. I'll be back at it tomorrow. :)
     
    sparky, Jul 29, 2006
    #437
  18. Jul 30, 2006
    Glenn

    Glenn Kinda grumpy old man Staff Member

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

    Try retarding the timing a little at a time, in steps (increments)? Just to see how it starts, runs, gets better or worse? I know it's grasping but that's all that's left to do seems like.
     
    Glenn, Jul 30, 2006
    #438
  19. Jul 30, 2006
    sparky

    sparky Sandgroper Staff Member Founder

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

    I already have done that along the way. First thing I did when it started to do this I believe, or one of the first.

    I haven't changed out the fuel filter yet. Mainly because I took it apart and cleaned it totally then put it back together, there were no visible obstructions. Guess I'll try that.
     
    sparky, Jul 30, 2006
    #439
  20. Jul 30, 2006
    spoon

    spoon New Member

    Spade, TX
    Joined:
    May 22, 2006
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    8
    Re: V6 Cutting out at cruising speeds?

    My Commando has always acted a liitle funny. But at least the tires look better.

    :beer:
     
    spoon, Jul 30, 2006
    #440
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