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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 8 of 50
  1. May 28, 2006
    sparky

    sparky Sandgroper Staff Member Founder

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

    I've had several :beer:s during the process. ;) I've enjoyed them but not the process. R)
     
    sparky, May 28, 2006
    #141
  2. May 28, 2006
    termin8ed

    termin8ed I didn't do it Staff Member

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

    I know its been said allready, but I'll go with the fuel too for what its worth. I missed a few pages so I might have missed you response, but did you ever check the exhaust pipe? Does it have one of those heat valve deals on the pass bank? any chance thats partially rusted off and blocking things?
    Only other thing I can suggest besides trying the other fuel tank like Jhuey said, make sure the carb air passages are clear.

    Hope you find it:/

    --just because you can go 60 in second gear doesn't allways mean you can go in 3rd. Once you hit 3rd gear the strain on the engine is alot more than in 2nd. It has to put out more power to overcome air, friction, drag...
    You might be able to produce enough hp and torque to overcome it in 2nd, but not enough in 3rd.

    I can't scientificaly explain it right now, but thats the jist of it;)
     
    termin8ed, May 28, 2006
    #142
  3. May 28, 2006
    sparky

    sparky Sandgroper Staff Member Founder

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

    Carb passages are CLEAN! I've rebuilt it. Replaced the hoses from the fuel pump too. ;)

    I know what you're saying Brian, that's my thinking on it too regarding engine load in 3, but still doesn't make sense that I have plenty of fuel in the other 2 gears and don't run out of fuel. I should be using LESS in 3rd to go 55 than I was in 2nd to go 60. That's the point of ODs, etc.

    It has headers and side pipes.
     
    sparky, May 28, 2006
    #143
  4. May 28, 2006
    jpflat2a

    jpflat2a what's that noise?

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

    what about at the tank/pickup end ? I know it's all new, but I think we've got to check and verify. The boat fuel can might be easy enough to rig up and try....

    The vac gauge fluctuating at idle still lingers in my head. We should be 18"-20"; we are not; location elevation can alter that, I know;
    I just don't buy the weak valve spring theory; all of them weak, all at the same time ?
    there is no factory spec (miles) for replacing valve springs ......heck, even on engines with 300K miles, I've never seen the valve springs replaced, just to replace them.......
    you might yank both valve covers off, and just do a visual on the springs, to make sure one isn't busted; it should be obvious thru compression readings; the readings would vary

    can you tell I'm running out of ideas.........
     
    jpflat2a, May 28, 2006
    #144
  5. May 28, 2006
    jpflat2a

    jpflat2a what's that noise?

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

    this reminds me of a post office Jeep we repaired
    post office changed fuel pump, carb coil, etc etc...
    on hard acceleration, would bog down and miss, stall, sputter, etc
    light, mid throttle okay
    the engine loom was rubbing at the rear of the 258 valve cover (metal)
    engine would torque, and wire with insulation worn thru would short on the valve cover; it was an ignition wire, maybe to the coil, I don't recall
    took us a while to find it too; powerbraking it in the shop would make it act up as well........guess we got lucky on that one
     
    jpflat2a, May 28, 2006
    #145
  6. May 28, 2006
    w3srl

    w3srl All-around swell dude Staff Member

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

    I'm sticking with fuel delivery too.

    At higher speeds the demand is greater in a higher gear. Don't forget to check for pinholes in the fuel lines/hoses. It's very possible to have a tiny pin hole that won't leack fuel, but will admit air under vacuum. They can be a ber to track down.
     
    w3srl, May 28, 2006
    #146
  7. May 28, 2006
    jzeber

    jzeber Well-Known Member 2022 Sponsor

    Morgan Hill, Ca
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    Re: V6 Cutting out at cruising speeds?

    Since it does it only in 3rd gear any chance a linkage is hitting a fuel line and blocking it?
     
    jzeber, May 28, 2006
    #147
  8. May 28, 2006
    jpflat2a

    jpflat2a what's that noise?

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

    I wish this Jeep were in my driveway...
    not that I'm better than anybody here......
    I love the challenge to find out what it is and fix it......
    e-fix is driving me nuts......
     
    jpflat2a, May 28, 2006
    #148
  9. May 28, 2006
    jhuey

    jhuey Michigan Jeeper!

    Indian River...
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    Re: V6 Cutting out at cruising speeds?

    Fuel pump tests consist of two checks, pressure and capacity. Maybe your pump has diminished capacity, a good pump should deliver 1 pint in 60 seconds.
     
    jhuey, May 28, 2006
    #149
  10. May 28, 2006
    sparky

    sparky Sandgroper Staff Member Founder

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

    I checked volume a couple weeks ago before pressure.

    It was somewhere in the range of 8 oz./30 seconds which should be ok for a 225. FSM only lists pressure though, not volume.

    Jim, if I had the return line hooked up wrong at the fuel tank, wouldn't this problem have manifested itself last fall in November when I changed the tank and then drove it all winter long?
     
    sparky, May 28, 2006
    #150
  11. May 28, 2006
    sparky

    sparky Sandgroper Staff Member Founder

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

    I think I've replaced all the lines but I've not checked the hose clamps yet. But the air being admitted. Perhaps back at the tank...

    *edit* Nope, I've not replaced all the flexible fuel line now that I think about it.
     
    sparky, May 28, 2006
    #151
  12. May 28, 2006
    jpflat2a

    jpflat2a what's that noise?

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

    most likely
    you woulda noticed it right away if it were to cause a problem

    gonna go outside and scream (not at you)
    be right back.....
     
    jpflat2a, May 28, 2006
    #152
  13. May 28, 2006
    jpflat2a

    jpflat2a what's that noise?

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

    this sounds too low to me
    if the F4 pump is supposed to be 1qt (32oz) in 60 seconds, you're way low in my opinion
    plug the return, get bigger container, and do it again..please :)
    5/16 hose/tubing should be blasting quite a stream, unrestricted from the pump while at idle
     
    jpflat2a, May 28, 2006
    #153
  14. May 28, 2006
    sparky

    sparky Sandgroper Staff Member Founder

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

    I can always borrow MOP's spare...

    I thought maybe it was, talked with Patrick on the phone, he didn't think it was too low, then I thought maybe it was, then the pressure was good and the FSM only lists pressure no volume so I moved on.

    I can check again. No reason not to at this point. :)

    The volume was from memory, I did that two weeks ago at least. R)
     
    sparky, May 28, 2006
    #154
  15. May 28, 2006
    jpflat2a

    jpflat2a what's that noise?

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

    I'd test yours again
    then install another pump
    then test output of that one and compare volume
     
    jpflat2a, May 28, 2006
    #155
  16. May 28, 2006
    sparky

    sparky Sandgroper Staff Member Founder

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

    Best lead I have right now. Seems like it's running out of fuel and I thought when I checked the volume it seemed low but I didn't know for sure.
     
    sparky, May 28, 2006
    #156
  17. May 28, 2006
    Old Bill

    Old Bill Aggressively passive....

    Really Southern...
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    Re: V6 Cutting out at cruising speeds?

    Sparky, when you say that you replaced fuel lines, did you mean that you replaced/checked the hard lines too? One kink or piece of crud in the line could do it. Also, have you tried driving with the gas cap slightly loose? Yes, these are very simple, and I know you didn't have these problems a while ago. Weirder things have happened....:rofl:
     
    Old Bill, May 28, 2006
    #157
  18. May 28, 2006
    sparky

    sparky Sandgroper Staff Member Founder

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

    Trust me the cap doesn't seal. R)

    I didn't replace the hard line, no. Unless I bought bad gas though, getting crud in them would be hard.

    I'm going to investigate the fuel pump more, like I said, I thought it was low on output, then didn't worry about it, but now I'm suspecting it again...
     
    sparky, May 28, 2006
    #158
  19. May 28, 2006
    sparky

    sparky Sandgroper Staff Member Founder

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

    So I'm thinking more about this.

    I had the fuel pump off to remove the timing cover before this happened.

    I can't figure a way but is it possible to install the fuel pump so it's not getting 100% of the lever action? Well, heck I don't know at this point. But I'm willing to ask anything. :D

    I didn't remove the fuel pump eccentric when I put the new distributor drive gear on. Still grasping at straws here.
     
    sparky, May 28, 2006
    #159
  20. May 28, 2006
    jpflat2a

    jpflat2a what's that noise?

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

    I've never tried to install one wrong, so I don't know :)
    seems the angle would be wrong, and the bolt holes probably wouldn't align properly, I'm guessing
     
    jpflat2a, May 28, 2006
    #160
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