Hey I have been hearing this wierd, loud hissing sound for a little over a month every time I start my truck up. It sounds like the turbo isn't spinning well or something like that. As soon as I put on a bit of gas it goes away for a bit but then comes back as soon as I stop accelerating or I am accelerating just a little. When the truck warms up the problem goes away and there are no more screams of death coming from my motor. I was wondering if anyone knew what this was caused by? Could it be bad turbo bearings or blades? Could it be something other than the turbo?

 

read this one
https://www.ford-trucks.com/forums/6...nge-noise.html

 

ah the mysterious EBPV. lol.