2000 F-250 hissing when i accelerate

[NIX 4X4]

It has been a bit colder then usual here in tennessee. When I start my truck i let it warm up a bit but then when i am driving i am getting a hissing noise it seems like only when I accelerate. Does anybody have any pointers?? Have i done something wrong or is this normal??

[Leeville Outlaw]

Its normal. Their is a flap in ur turbo exhaust that will close whenever it is cold out. helps to warm the engine faster

[NIX 4X4]

That is kinda what I gathered by browsing some of the other threads just worried me a bit cause I have never heard it do that before. Thanks for the reply!

[bwillis2003]

that happened to me yesterday! i know it hisses sitting there to warm up faster but thats the 1st time it did it while driving

[NIX 4X4]

Im glad im not the only one i was freakin out for a miniute but everything i hear says it's normal just something it does when ts cold to help it warm up.

[bwillis2003]

ya it closes up but i didnt know it did it while driving, so I was like crap not again, somethin broke ha. But ok cool I guess everything is good! Thanks