1. Registration trouble? Please use the "Contact Us" link at the bottom right corner of the page and your issue will be resolved.
    Dismiss Notice

Fixed: V6 Cutting out at cruising speeds?

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

Page 16 of 50
  1. Jul 28, 2006
    BlueFlu

    BlueFlu past owner of some ecj5's

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

    Ok lets try this, next time it does this, pull over and pop the air filter off. Run it up and see what happens. Got nothing to loose.
    Had an air filter on my Road Runner that would make it act goofy. :oops:
     
    BlueFlu, Jul 28, 2006
    #301
  2. Jul 28, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
    Joined:
    Sep 20, 2002
    Messages:
    9,221
    Re: V6 Cutting out at cruising speeds?

    Plugs are 3 months old, I've been troubleshooting for about 2.5 months. I can't figure how they'd cause this. But they were the one thing I replaced besides the distributor right before all this started. I've not swapped them out since...
     
    sparky, Jul 28, 2006
    #302
  3. Jul 28, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
    Joined:
    Sep 20, 2002
    Messages:
    9,221
    Re: V6 Cutting out at cruising speeds?

    I could try that. Heck I've got another air filter assembly (oil bath) at home, I could swap those out. :rofl:
     
    sparky, Jul 28, 2006
    #303
  4. Jul 28, 2006
    Mudweiserjeep

    Mudweiserjeep JEEP: Bouncy and Fun

    tipp city, ohio
    Joined:
    Jun 17, 2004
    Messages:
    718
    Re: V6 Cutting out at cruising speeds?

    that's a lucky oilbath if I remember right........;)
     
    Mudweiserjeep, Jul 28, 2006
    #304
  5. Jul 28, 2006
    jpflat2a

    jpflat2a what's that noise?

    Hermosa, SD
    Joined:
    Jul 30, 2003
    Messages:
    8,525
    Re: V6 Cutting out at cruising speeds?

    I'm goin with electrical/ignition problem
    plugs/plug wires/ballast res/crossed plug wire
    distributor problem/broken lead wire
    wire arcing somewhere
    coil breaking down
    bad ground/ignition switch/loose contacts/ground strap
    you get the picture
    broken record: hook it up to a diagnostic scope: primary/secondary pattern
     
    jpflat2a, Jul 28, 2006
    #305
  6. Jul 28, 2006
    MCSCOTT

    MCSCOTT Member

    Columbia, Tn
    Joined:
    Apr 24, 2006
    Messages:
    905
    Re: V6 Cutting out at cruising speeds?

    I haven't really read through the whole thing, but are you sure the MSD box is good? At least I think I read somewhere that you had MSD on it and I have seen them give up before. I'm a little lost on this, and really don't have much info to offer. I will leave now.:)
     
    MCSCOTT, Jul 28, 2006
    #306
  7. Jul 28, 2006
    Mudweiserjeep

    Mudweiserjeep JEEP: Bouncy and Fun

    tipp city, ohio
    Joined:
    Jun 17, 2004
    Messages:
    718
    Re: V6 Cutting out at cruising speeds?

    Have you swapped HEI modules to see if thats it? It does seem like a coil type of problem.
     
    Mudweiserjeep, Jul 28, 2006
    #307
  8. Jul 28, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
    Joined:
    Sep 20, 2002
    Messages:
    9,221
    Re: V6 Cutting out at cruising speeds?

    Diagnostic scope?

    If it is an ignition problem, then it's before or after the distributor. Remember two different distributors. one points unit, one HEI unit (in there now). Started doing it with the points unit. So I'm gonna rule out the coil, ballast (don't have one), plug wires (different ones for HEI vs. points).

    Why would a wire only arc in 3rd gear? Why not at a set RPM? It's only happening in 3rd. Soon as I pop it out, revs right up no problem. Soon as I put it in 2nd runs great. 3rd runs right up to 55-60 and coughs and stumbles.

    Guess I need to have someone smarter than me fix it. :mad:

    I said if the cam didn't fix the problem I'd give the site to someone more capabable. I'll be taking applications and letting someone else decide who's capable since I'm not. :rofl:
     
    sparky, Jul 28, 2006
    #308
  9. Jul 28, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
    Joined:
    Sep 20, 2002
    Messages:
    9,221
    Re: V6 Cutting out at cruising speeds?

    It's not hooked up.
     
    sparky, Jul 28, 2006
    #309
  10. Jul 28, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
    Joined:
    Sep 20, 2002
    Messages:
    9,221
    Re: V6 Cutting out at cruising speeds?

    Points distributors don't use modules. It did it with a points and an HEI unit.
     
    sparky, Jul 28, 2006
    #310
  11. Jul 28, 2006
    BlueFlu

    BlueFlu past owner of some ecj5's

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

    Sparky dont give up.
    It'll be simple, after you find it.
    Do you have a vacum gauge? Hook it up and drive it around.

    Swap the plugs out, they could just be the issue.

    Another thought, when you had the intake off, did you notice any bad spots?
    Wondering if the intake may be cracked or warped. :?
     
    BlueFlu, Jul 28, 2006
    #311
  12. Jul 28, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
    Joined:
    Sep 20, 2002
    Messages:
    9,221
    Re: V6 Cutting out at cruising speeds?

    Have a vacuum gauge, tried to figure out how to hook it up and drive, guess I need more hose.

    Intake looked good. Guess I could buy starter fluid and check.
     
    sparky, Jul 28, 2006
    #312
  13. Jul 28, 2006
    BlueFlu

    BlueFlu past owner of some ecj5's

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

    It'll only take a slight warp to make it goofy.
    Get Billy to sit on the engine cowl. R)
     
    BlueFlu, Jul 28, 2006
    #313
  14. Jul 28, 2006
    jayhawkclint

    jayhawkclint ΜΟΛΩΝ ΛΑΒΕ

    Oklahoma City, USA
    Joined:
    May 18, 2006
    Messages:
    2,622
    Re: V6 Cutting out at cruising speeds?

    Sorry if someone already posted this. Thread is pretty long and I may have missed it before:

    You said heads were redone... I haven't pulled valve covers on the Dauntless yet, but are the rockers fully adjustable? If so, is there the slight chance that one or more of them have too much preload? It would be possible that you had them dialed in at cold, but not at operating temp. Have you tried running the engine for a while to get it up to temp, then readjust valve lash? If you were cranked down too far it would cause the symptoms you're describing, and I've experienced them before for same reason.
     
    jayhawkclint, Jul 28, 2006
    #314
  15. Jul 28, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
    Joined:
    Sep 20, 2002
    Messages:
    9,221
    Re: V6 Cutting out at cruising speeds?

    Rockers aren't really adjustable. They're on a shaft. I torqued 'em down to the lightest spec in the FSM. At least there's nothing in the FSM about adjusting them. It just says torque to "blah".

    I hadn't touched them when this all started either. I just had the heads redone to see if they were causing the issue. Did it before, now does it after.
     
    sparky, Jul 28, 2006
    #315
  16. Jul 28, 2006
    jayhawkclint

    jayhawkclint ΜΟΛΩΝ ΛΑΒΕ

    Oklahoma City, USA
    Joined:
    May 18, 2006
    Messages:
    2,622
    Re: V6 Cutting out at cruising speeds?

    I know it may be a long shot, but...

    I just rebuilt a Vortec 350 on a '99 Suburban. Had a similar problem, but it did from idle and up. Just general loss of power. It had a slight stumble at idle, and every once in a while I'd get a pop when trying to start it. Even though I had adjusted my valves to the GM FSM, I eventually found that a couple intakes rockers were torqued down too far. You may have already tried this, but I finally pulled the valve covers and just backed off the rocker capture nuts until my stumble went away. It literally runs like new now.
     
    jayhawkclint, Jul 28, 2006
    #316
  17. Jul 28, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
    Joined:
    Sep 20, 2002
    Messages:
    9,221
    Re: V6 Cutting out at cruising speeds?

    Like I said, it's shaft mounted, there's three bolts, I can't adjust individually. I torqued them to the lightest spec. It did this BEFORE I had the heads off and I hadn't touched the rockers or the heads. :(
     
    sparky, Jul 28, 2006
    #317
  18. Jul 28, 2006
    blevisay

    blevisay Oh Noooooooooooooooo! Staff Member

    Portland Tn.
    Joined:
    Sep 20, 2002
    Messages:
    4,350
    Re: V6 Cutting out at cruising speeds?

    There are only 3 things that make an engine run

    Compression should be good

    Spark Tried 2 different set ups

    Fuel good pump filter lines carb......have you checked the tank for foreign bodies? (water)
     
    blevisay, Jul 28, 2006
    #318
  19. Jul 28, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
    Joined:
    Sep 20, 2002
    Messages:
    9,221
    Re: V6 Cutting out at cruising speeds?

    Nope, why would it only affect it in one gear, not all the time? That's the thing that keeps getting me. Just 3rd gear. Just 55 mph.
     
    sparky, Jul 28, 2006
    #319
  20. Jul 28, 2006
    termin8ed

    termin8ed I didn't do it Staff Member

    Mason, MI
    Joined:
    Dec 22, 2002
    Messages:
    4,422
    Re: V6 Cutting out at cruising speeds?

    I'm really reaching here...
    You said you don't have the msd hooked up.
    You do have the points distributor hooked up.
    sounded like you don't have a ballast resistor hooked up??
    Would the full 12v cause problems for the coil and points?
    I know it will burn the points up quicker.
    Have you checked the condition of the points???


    Like I said, just reaching;)
     
    termin8ed, Jul 28, 2006
    #320
Page 16 of 50
New Posts