2000 7.3L turbo Air Noise

[Okiestroke]

have a 2000 F 350 7.3L turbo powerstroke. Has 104K Miles. Under load pulling up a long hill when the trans drops down a gear
and rpm kicks up and throttle increases the turbo stahts to hiss then makes a sound like a high pitch bugle. Sounds like air horn like noise. when you
back off on throttle and loud air whine lowers until it stops. sounds like a air valve either not opening or closing all the way and trying to force thru it.
Any one have any ideas. The noise is deafening!

[powerhoghp]

Wastegate.....

[powerhoghp]

The wastegate on the turbo releases drive pressure (exhaust) at a certain point to prevent excess backpressure and excessive turbine speed. Crud can build and cause a higher pitch noise.

[jesilvas]

Does it blow black smoke? I've never heard the WG opened up before. I know it works.

[Okiestroke]

Maybe the wastegate actuator is getting weak? no black smoke that I noticed. thx

[powerhoghp]

Anything been done to the truck or is it stock?

[Okiestroke]

It is stock. I bought it about 2 months ago and only drive it about 3 times per month pull three horse trailer with living quarters. Going up incline and under load and throttle open is when excessive noise horn sound happens. thx

[cowpuncher]

Sounds like you have a loose clamp or a blown hose between the turbo, aftercooler, or intake, I would tighten all clamps and look for a torn hose.

[jesilvas]

Originally Posted by cowpuncher

Sounds like you have a loose clamp or a blown hose between the turbo, aftercooler, or intake, I would tighten all clamps and look for a torn hose.

That's what I been thinking. Except it doesn't blow any black smoke so it's getting enough air. Must be a REALLY small hole.

[cowpuncher]

A loose clamp wil make a high pitched noise and not much smoke and it only happening under load from the sounds of things so I gave him the cheap and first place to start point if that checks out then OP can post for more ideas. Good luck