Thread: Hit a bump and misses....

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  1. #1 Hit a bump and misses.... 
    Member PilotAustin's Avatar
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    So to make this short and sweet, Sometimes when I hit little bumps it dies like a miss and when I hit a big one it dies alltogether and sometimes doesnot come back on after I try cranking it until i get out and jiggle wires and tap on things.
    Some history though with this jeep, one day I was going to work and it blew the ASD fuse and I could not figure it out till I trailered it home.
    Replaced Fuel pump last year.

    Any Ideas
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  2. #2 Re: Hit a bump and misses.... 
    Senior Member dp96zj's Avatar
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    Check the connectors at your PCM. The ones on my dad's ZJ came loose and it would die every so often.

    Quote Originally Posted by Derek33
    Its a jeep, it doesn't have to make sense.
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  3. #3 Re: Hit a bump and misses.... 
    Senior Member ATL ZJ's Avatar
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    Quote Originally Posted by PilotAustin View Post
    So to make this short and sweet, Sometimes when I hit little bumps it dies like a miss and when I hit a big one it dies alltogether and sometimes doesnot come back on after I try cranking it until i get out and jiggle wires and tap on things.
    Some history though with this jeep, one day I was going to work and it blew the ASD fuse and I could not figure it out till I trailered it home.
    Replaced Fuel pump last year.

    Any Ideas
    what year and engine?

    I'd start by checking plug wires, coil wires and injector wiring connectors...
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  4. #4 Re: Hit a bump and misses.... 
    Senior Member it usually runs fine's Avatar
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    I would look for the ground wire from the engine block to body.
    Some girls don't like guys like me, but some girls do.
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  5. #5 Re: Hit a bump and misses.... 
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    As been said, check the connection at the ECU/PCM and all wiring. Mine was the connection at the ECU/PCM when mine did this earlier this year after installing the JET module, duct tape took care of it!
    96 4.0 ZJ, 4.5in RE coils with Teraflex arms, Yukon gears, ARB front bumper, 33x12.50 M/TR's, homemade OBA setup....

    97 with stuff....
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  6. #6 Re: Hit a bump and misses.... 
    Member PilotAustin's Avatar
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    I thought that might be the problem! We shall see tomorrow...

    Also, would anyone know about the VIC not working even though i went and got another one from the junkyyardy??
    Honky.
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  7. #7 Re: Hit a bump and misses.... 
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    One time on the 4.0 back in like 2004 I unplugged my coil wire doing some maintenance or something, forgot about it, and for a while when driving around it would die/miss when I hit bumps.

    Was poking around under the hood a few days later and realized my coil was still unplugged and the spark had been arcing through the boot to fire the plugs.

    Kind of amazed it ran at all. Anyway, worth checking.
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  8. #8 Re: Hit a bump and misses.... 
    Senior Member dp96zj's Avatar
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    Quote Originally Posted by PilotAustin View Post
    I thought that might be the problem! We shall see tomorrow...

    Also, would anyone know about the VIC not working even though i went and got another one from the junkyyardy??
    Maybe you picked up another crappy VIC, or you have a blown fuse. BTW, where are you located in Houston?

    Quote Originally Posted by Derek33
    Its a jeep, it doesn't have to make sense.
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  9. #9 Re: Hit a bump and misses.... 
    Member PilotAustin's Avatar
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    Up here in kingwood. IDK i think i looked at the right fuses but I dont have the diagram.

    Sorry ATL ZJ
    Its a 96 5.2 AWD
    Honky.
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  10. #10 Re: Hit a bump and misses.... 
    Senior Member Grand Slam West Planner
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    When in doubt, check ALL the fuses. Sometimes it's the one you swear it couldn't be.

    Make sure wiring is good from the fuel pump forward. Check every wiring harness connector you see.
    Jim Karlin
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  11. #11 Re: Hit a bump and misses.... 
    Member PilotAustin's Avatar
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    okay well the sucker is now deciding to work??? strange thing is whenever i fix one thing, something totally diff breaks? My water pump has now sprang a leak how nice....... i just had all the front end off and something told me to do it while it was right there ( had to do a harmonic balancer, front main, oilpump)

    just my luck
    Honky.
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  12. #12 Re: Hit a bump and misses.... 
    Senior Member dp96zj's Avatar
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    Quote Originally Posted by PilotAustin View Post
    okay well the sucker is now deciding to work??? strange thing is whenever i fix one thing, something totally diff breaks?
    It's a Jeep thing

    Quote Originally Posted by Derek33
    Its a jeep, it doesn't have to make sense.
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  13. #13 Re: Hit a bump and misses.... 
    I am EPIC Staff JordanA's Avatar
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    It's got to be lose electrical connections somewhere.
    Krash80: And my trailer weighs 8,000 lbs empty.
    CurtP: What does your house have to do with any of this?


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  14. #14 Re: Hit a bump and misses.... 
    Junior Member chris93jeep's Avatar
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    i would check your battery terminals. start easy and then work your way back. it sounds like you just have a bare wire or a bad conector. on my zj i use to have a very small ground wire with 2 bigger ones at the battery terminal. the little one always wiggle loose and it will just die. its the little things that piss you off.
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