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
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.
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When it regens it will boost the rpm up and make about 5-10psi of boost
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The engine is stone cold. Is it trying to regen cold?
D.Tibbitt Thanks this. -
circle h Thanks this.
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Thanks. I'll take it a distance. Done nothing long enough to get it hot.
Last edited: Oct 13, 2021
D.Tibbitt Thanks this. -
Is the wistle consistent or does it change or come and go with RPM/ Boost while driving?
Warm its gone?circle h Thanks this. -
Goodysnap Thanks this.
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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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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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