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2000 7.3L turbo Air Noise
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!