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AIR LEAK DIAGNOSIS

Discussion in '6.9L IH & 7.3L IDI Diesels' started by PROFG, Nov 7, 2019.

  1. PROFG

    PROFG Full Access Member

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    Can we have a single spot where air leaks are diagnosed by starting/running behavior of IDI? I propose the following which will be edited to keep up to date. Post ones you have found/fixed.

    1- Starts, after priming, and idles fine for minutes, dies seconds after gunning it in neutral to > 1500 rpm. Found weak LP, good IP, small leak top of filter.No bubbles in filter return llne while idle since air not sucked in until IP oversucked (the technical term :p) by LP.

    2- Starts after priming, idles fine for minutes, ok to gunn it, no bubbles in filter return until AFTER shutdown. Hard next start. New LP keeping suction pressure positive until fuel drain back pulls vacuum and same air leak ahead of IP.

    3- Starts right up and dies seconds later. Long cranking to start. Air in filter but not IP, hard lines, returns, or injectors.
     
  2. Thewespaul

    Thewespaul Supporting Vendor Supporting Member

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  3. PROFG

    PROFG Full Access Member

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    Thanks, found it on page 3 after searching for "air"

    Edit Reread sounded kind of sarcastic No more data will be added by me.
     
    Last edited: Nov 7, 2019
  4. franklin2

    franklin2 Full Access Member

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  5. PROFG

    PROFG Full Access Member

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    Second link goes to same place as first- I READ IT. Just seems doesn't cover all the leaks and how they affect starting but oh well, wth, don't want a p99809 contest.
     
  6. franklin2

    franklin2 Full Access Member

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    I was just making it easier for everyone else looking at this thread to find it.
     
    riphip and Chief like this.
  7. PROFG

    PROFG Full Access Member

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    My bad, thanks.
     

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