What is this sound with the turbo?

[huntercox]

It sounds normal before around 1600 rpms but then when i stop putting the pedal down and just keep a constant speed it starts to spin faster and hiss really loud. It doesnt sound like this is normal if i gas on it or let off the pedal it sounds like somthing closes and goes back to normal. Any possible ideas?

[huntercox]

also have a video but cant figure out how to upload it hard to explain the sound... anybody know how to get the vid on here

[huntercox]

YouTube - What is this sound coming from the turbo? Ford 7.3

YouTube - What is this sound coming from the turbo? Ford 7.3

sound starts after turbo spools up around 5 or 6 seconds

[sniper_101]

Winter Operation, Hard Starting, Hissing Sound Etc...



Winter Operation, Hard Starting, Hissing Sound Etc...

[huntercox]

Doesnt do it until it gets warm though

[powerstrokefan1]

Its your exaust back pressure valve opening and closing the same thing happened with my truck. its supposed to do it but if u wanna fix it unplug the sensor underneath the turbo.

[huntercox]

Originally Posted by powerstrokefan1

Its your exaust back pressure valve opening and closing the same thing happened with my truck. its supposed to do it but if u wanna fix it unplug the sensor underneath the turbo.

Thanks any negative things happen if I unplug it?

[powerstrokefan1]

nope mines been unplugged for a year no codes to truble warming up i think the sensor is useless

[huntercox]

thanks for the help