Sounds like high pressure air, under heavy acceleration.

[KMcKinley1]

First post, new to this site. My 6.0 Excursion is running smooth but has been making a sound just under the hood that sounds like high pressure air blowing. It only happens under Heavy acceleration. Wondering if anyone has had this same issue?

[tech10002]

Check all the boots on the boost tubes, turbo, and intercooler for small holes or looseness. That would be the most likely cause.

[KMcKinley1]

Thanks,
I will check tomorrow after work. will let you know what I find.

[fallendown]

And put up some more truck info...it might be helpful!

and Welcome to the ORG

[Blue05]

I just went through the kinda think with my truck, after i inspected all my boost tubes and boots 3 times over, it ended up being a loose clamp on the downpipe where it connects to the turbo.

[RescueF250]

If its not your boost tubes or boots, also look into the Y- pipe as well might be coming from there cracks.