strange owl noise

[now-stock]

07 psd fx4 dualy, i get a strange sound at about 20-40 miles an hour when pressing throttle only that sounds like you are blowing over the top of a bottle or like a howl from an owl comming from under the truck let go of the throttle sound goes away any ideas ??????

[pipelayerjdh]

I think my dad's truck does that also, but I'm not sure what it is. I'm not around the 6L's much.

[Halla2]

My truck does the same thing not sure what it is but good question. I would like to know myself.

[now-stock]

i'll keep in touch we have a lot of good mech's in miami will be at dealer todaylet you know. thanks for the reply good to know i'm not the only one

[jim carrasco]

my truck makes that noise and i have found that the y pipes from the manifolds to the turbo are leaking,to check this look under the truck to the middle of the top of the bell housing and you can see the pipes from the exhause manifold to the turbo and if there is black soot on the pipes they are probably leaking and they will make a whistleing noise on acceleration,they can be changed but they are kind of a pain and bolts break.i think i bought all the pieces for about 150.00.you do have to buy the parts seperatly from what i found,check it out and good luck.