2001 F250, 7.3 wont start

Discussion in '99+ 7.3L PowerStroke Engine & Drivetrain' started by GA_Boy, Sep 21, 2018.

  1. GA_Boy

    GA_Boy SDD Junior Member

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    I have been to all sorts of Mechanics and nobody can diagnose my problem.
    Sometimes it will run and sometimes it will not run. Starter turns engine fast.
    I replaced the CPS and it was not that. When cranking the RPM indicator moves a few hundred RPM's so it is good. Ford dealer can't get any bad codes.
    Sometimes It will not start and I wait an hour or so and try again and sometimes it will crank after the wait.
    Any IDEAS?
    Marvin
    EDIT-----How can I troubleshoot the Fuel filter oil reservoir?
     
    Last edited: Sep 21, 2018
  2. DaveBen

    DaveBen SDD Senior Member

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    Scan it and tell us what codes you get.
     
  3. Mick

    Mick 97 Powerstroke

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    Other things to check: HPOP not getting to pressure or sensor not reading correctly, the PCM connection or IDM itself, maybe glow plug relay if it primarily won't start when cold. Intermittent problems are pretty tricky. Just tossing out a few ideas. It's been a long time since I played with the trucks so I'm pretty rusty.
     
  4. Vandecamper

    Vandecamper SDD Junior Member

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    This same thing happened to me many years ago and the solution was to replace the battery cables to the starter and block. An auto electric guy figured it out. This fooled everybody for about 3 months. No codes, nada, took it to the dealer, a couple independent shops and finally the auto electric guy. Since you're starter turns the engine - it's probably not the battery cables but it may be a lose ground somewhere or a bad plug. Take everyone you can find apart and clean up any ground connections.
     
  5. tonjon

    tonjon SDD Junior Member

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    Make sure your oil level is topped up. Injectors need oil as they’re hydraulic. No oil equals no fuel. Trust me I’ve been there
    Tony
     
  6. rvbsmart

    rvbsmart SDD Junior Member

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    Find the high pressure oil sensor right behind the HPOP, on the driver side head, and unplug the harness. If the harness plug is full of oil, leave it unplugged and try cranking the truck. If it cranks, you have found your problem. Replace the sensor and either clean or replace to plug and you should be good to go.

    Sent from my SAMSUNG-SM-G930A using Tapatalk
     
  7. hawkdriver

    hawkdriver Full Access Member

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    I would also check the under valve cover connections. Only takes a few minutes to remove them. I had secured both harnesses while doing an HPOP replacement a few years ago but the plastic had become brittle and my quarter mod had failed because of it. Zip ties fixed it and was back on the road a few months ago after scratching my head like you are right now.
     

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