X5 whooshing sound apon acceleration
 

Well in my 4.6is apon acceleration it makes this whooshing noise like a BOV,I have no idea what it is,Just happens apon shifting between gears when flooring it.
Anyone had this problem?Lmk please.
thanks
:dunno:

I think I might have same "whistle" in between shifts, planning on changing trans fluid and filter. A few people from these boards suggested to me to search chirping, woot, and a few other words I can't remember off the top. They might give u more ideas.

i personally dont think its a problem. my 4.6 makes the same sound when shifting at higher rpm's. a quiet bov is exactly how to describe it. its not all the time either. more or less when its cold. once the engine gets up to temp it goes away. i was always curious though what is was making the noise.

I have the same noise and my tranny was rebuilt recently. Did the noise before the rebuild as well.

i read somewhere in this forum that says that a tear at the air intake duct can cause some kind of whistling sound during acceleration

i get this if i floor the pedal to the floor and i also get a whistling type noise but then goes away when i start to drive it in a normal manor

I know this sounds crazy but this is what I did. I had the same wooshing sound you describe, when I turn off the radio the wooshing sound goes away. At least for my car it appeared to be some interaction with the audio system.

Don't worry about it, every single 4.6 makes this noise. It is not the shifting that does it, but the way the throttle closes when you either upshift or let off. You will get the same noise if you put it in manual mode, slam on it and let off around 4-5k RPM. I bought the truck from a friend who had it from 10k miles on, and it has always made the noise.

It sounds like a mixture of a bird chirp and a BOV. If that's what you're talking about, don't worry about it. I actually found the same problem on a customer's E55 with a ported throttle body. The throttle plate most likely rubs a little and is feathered closed by the computer so that there is no lurch when you let off the gas.

My 4.8 does it too. Whoosh sound on hard acceleration sounds like a valve. Haven't thought it to be a problem.

Scott