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Thread: 2014 Jk wonít start

  1. #1
    Nothing but a Thing Gadget's Avatar
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    2014 Jk wonít start

    Drove once this morning, got home. Went back out about 1/2 hour later. It will start and run for maybe 3 seconds then dies. Any ideas?


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  2. #2
    Knows a Thing or Two Bierpower's Avatar
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    If it fires and dies is most likely a computer issue.

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  3. #3
    Nothing but a Thing boardsurfer's Avatar
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    Quote Originally Posted by Bierpower View Post
    If it fires and dies is most likely a computer issue.

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    Key/security problem?

  4. #4
    Knows a Thing or Two Bierpower's Avatar
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    Quote Originally Posted by boardsurfer View Post
    Key/security problem?
    Guess it could be a cam/crank sensor as well. Engine fires, doesn't get a running reading and stops sending spark to the coils. It really needs to be hooked up to a scanner to see what's going on when it fires.

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  5. #5
    Nothing but a Thing 2nd.gunman's Avatar
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    Quote Originally Posted by Bierpower View Post
    Guess it could be a cam/crank sensor as well. Engine fires, doesn't get a running reading and stops sending spark to the coils. It really needs to be hooked up to a scanner to see what's going on when it fires.

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    Usually cam/crank sensor failure will stop it from starting not from staying running. Not 100% familiar with the 3.6 but that has been my experience with other engines


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  6. #6
    Old Timer Clutch's Avatar
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    Alternator?


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  7. #7
    Knows a Thing or Two Bierpower's Avatar
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    Quote Originally Posted by 2nd.gunman View Post
    Usually cam/crank sensor failure will stop it from starting not from staying running. Not 100% familiar with the 3.6 but that has been my experience with other engines


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    That seems right. I haven't turned wrenches for 5 years now so I've forgotten the details on some of the diagnostic stuff.

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  8. #8
    Nothing but a Thing Snboarder113's Avatar
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    Does it start then turn off. Or does it start then sputter itself out.

    If itís shutting itself off itís security.


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  9. #9
    Nothing but a Thing nbunga's Avatar
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    Quote Originally Posted by Snboarder113 View Post
    Does it start then turn off. Or does it start then sputter itself out.

    If itís shutting itself off itís security.


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    This

    Thereís a little red light with no label on the right side of the dash, above the temp gauge, thatís for your security system. Is that coming on before it shuts down? I donít think you can even tell thereís a light there unless itís on.

  10. #10
    Hooked Noble Woodsman's Avatar
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    Quote Originally Posted by 2nd.gunman View Post
    Usually cam/crank sensor failure will stop it from starting not from staying running. Not 100% familiar with the 3.6 but that has been my experience with other engines


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    The crankshaft position sensor (i think that's the one - it's on the bell housing) will shut down a running engine when the sensor fails, because the computer can't figure out the timing. This usually happens when the sensor is warmed up, and can be tricky to reproduce. If the engine starts and runs after sitting overnight, it could be this sensor. Otherwise, if you can reproduce the 3 second shut down on a cold engine, I agree that it's probably the key fob or security. I would try your second key if you have one or replace the key fob battery.


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