It got a little cold out and my isx15 is whistling. Is this normal?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by circle h, Oct 13, 2021.

  1. circle h

    circle h Light Load Member

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    Cold the idle has gone up to 760 and it's generating a bit of boost, so you can here it whistle. Is this normal for an isx15? It's a 2016 with 500k on it and new to me. Thanks
     
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  3. D.Tibbitt

    D.Tibbitt Road Train Member

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    When it regens it will boost the rpm up and make about 5-10psi of boost
     
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  4. circle h

    circle h Light Load Member

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    The engine is stone cold. Is it trying to regen cold?
     
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  5. D.Tibbitt

    D.Tibbitt Road Train Member

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    If the engine wants to regen and not at temperature , it will raise the rpms up to build heat until it reaches the temp where it will start a full regen.
     
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  6. circle h

    circle h Light Load Member

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    Thanks. I'll take it a distance. Done nothing long enough to get it hot.
     
    Last edited: Oct 13, 2021
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  7. Goodysnap

    Goodysnap Road Train Member

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    Is the wistle consistent or does it change or come and go with RPM/ Boost while driving?
    Warm its gone?
     
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  8. circle h

    circle h Light Load Member

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    It goes away when I bring the idle up. I haven't driven it since it did it yesterday. I got home from a short 3 mile no load trip, parked in the lot started it two hours later to put it in its garage and it did it for the first time. Started it today and cold it did the same thing. Bring the idle up to 1000 and the boost and whistle go away.
     
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  9. Goodysnap

    Goodysnap Road Train Member

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    Hard to say for sure without hearing it. Some call a normal turbo noise a whistle.

    More common would be an exhaust manifold gasket cracked and leaking. Inspect for soot trails (black streaks) around the manifold to cylinder head, especially #2 and #5. When the exhaust back pressure leaks by the bi-metal gasket it whistles like a blade if grass between your thumbs.
     
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  10. circle h

    circle h Light Load Member

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    Thanks, I'll have a look.
     
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  11. circle h

    circle h Light Load Member

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    I drove it today, got it up to temp and ran about forty minutes. It still does it, warm or cold. Whistle must just be turbo whine. It goes away off idle. Why would it be kicking the idle up to 760 and adding boost?
     
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