Question about Ford F-350 Super Duty

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I have a 1999 ford 1ton truck witha 7.3 diesel motor the motor was replaced as well as the wiring I have driven it approx 5 times what the problem is , is that while driving once and a while the truck while just die as if the key was turned off but restart right away with a big bang noise kinda like a back fire this happens while just idling as well but it just stops and of does not start I think the only reason it restarts while driving is becauser its moving and just jump starts itsself . It seems strange if we look just at the idle stance it would be running fine very smoth no vibrations step on peddle it revs up and down smooth and then for no apparent reason dies kinda like it hits a dead spot any clue what the problem could be ????

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  • Leighton Hurry Oct 04, 2010

    I think I may have given wrong diagnostics on the truck the back firiing was do to the engine shutting down while moving thus jump starting itself . When it is idling it runs real smooth and then it just dies no warning lights come on and there is no hesatation when stepping on gas peddle

  • Leighton Hurry Oct 04, 2010

    If you can help me it would be great and if you can please walk me thru any proceedures as my memory is not that good due to illness I have basic tools but nothing hi tech hopfully you can help. I would really perfer not to send it to a shop. Thankyou

  • Leighton Hurry Oct 05, 2010

    Thankyou for all your help I will check it out and if I have any question can I get back to you ?

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  • Ford Master
  • 1,051 Answers

Sounds like either the engine timing was not set properly when the new engine was installed. (Improper timing will cause the engine to backfire and shutdown) or there's an ignition short that causes the engine to shutdown. Do any of the 'check engine' lights come on just before it shuts down?

Posted on Oct 01, 2010

  • Bob Korsu
    Bob Korsu Oct 02, 2010

    After futher thought, you may have a problem with the timing belt. If the engine was replaced with a new crate engine, this would be unlikely. If,however, it's a rebuilt engine it may be a problem.

  • Bob Korsu
    Bob Korsu Oct 05, 2010

    lhurry, Sounds like you'd love to have a manual with step by step instructions. If so go to autozone.com and register for free. Your registration will give you access to dozens of on-line car and truck manuals which will everything you need.



    I'm in no way affiliated with autozone, just passing on what I've found to be very useful. info.

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8c95667.jpg

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d8f4563.jpg

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3f891cd.jpg

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