High pitched whistle when you accelerate? I found where mine was coming from.

[SuperGreg]

Originally Posted by X5ive

My X5 makes the same annoying whistle.
Below is my original thread
http://www.xoutpost.com/x5-e53-forum/...whistling.html

After this thread was original posted, I had my local dealer and an independent shop inspect my air boot. Both acknowledged that the air boot has surface cracks only and not leaking. They also clam the whistle is normal or common with the 3.0 X5 and coming from the intake manifold.

I have been telling people that it's normal for years on the 3.0. Mine is a 2002, and has done it since new.

[BiMMeRxCincO]

i get the whistling too...its seems believable that this could be normal because so many ppl have the issue but then when i think about it how the hell could a BMW, "the ultimate driving machine" have such a terrible sound...just talkin about it now is pissing me off, that piercinggggg shriek of a whistle. i think its embarrassing to be driving an X5 with that noise coming from it and the more i hear about it the more i think the dealer just downplays it...

anyway, ill be checking the air boot too. I pray to God that this will solve my problem cuz im gettin heated...

[The Cleaner]

It maybe common, but not all X5 have it. Since the boot replacment on my X5 I have not heard the sound. I do have a sucking sound when I shut the car down and the dealer said that was normal. I found that sound also, common maybe... but not normal. These things BECOME normal because they are not getting fixed.

The standard answer is "Normal" ... and so far everything I bothered to bring to the dealer on CPO was "NORMAL". I finally stopped waiting my time and I fixed the stuff myself.

[Stewthebassman]

I'm going to add my two bits to this thread, it is a worthy thread, worthy of a bump.

My 2002 3.0 has this noise, and it is unbelievable that it is there.

Get this.

I complained about it last February when I had a check engine light. Of course I got the Gas Cap fault, and the mechanic said the whistle went away with the gas cap getting screwed in properly. Of course that is BS.

I think half the "Technicians" don't know X5s that well, is this possible?

Thanks to this forum I will check the boot as well. It won't be the first underbuilt piece in this engine that has caused problems.

[broknlgs24]

um, this too is affecting me and my '03 4.6is.
as w/ the rest of u, my dealer tells me it's normal.
i do not believe them. i have an AFE Intake on mine
and still get the whine. any ideas where i can check
for these cracks? i believe my setup is different than
those of u w/ 3.0's.

[The Cleaner]

Seeing as many people do not have the boot crack as I did we must have 2 different noises going on and since the noise is in several engine sized It has to be a common system. The variable intake unit 11 61 7 544 805 is very high on my list as the possible causes. They run a couple hundred bucks, so it’s an expensive thing to try.

I do know for sure that this unit is responsible for the sucking sound almost every 3.0 makes about 3 seconds after shut down.

[noncom23]

Originally Posted by The Cleaner

Seeing as many people do not have the boot crack as I did we must have 2 different noises going on and since the noise is in several engine sized It has to be a common system. The variable intake unit 11 61 7 544 805 is very high on my list as the possible causes. They run a couple hundred bucks, so it’s an expensive thing to try.

I do know for sure that this unit is responsible for the sucking sound almost every 3.0 makes about 3 seconds after shut down.

So, in the 4.4, the throttle related whine, could it also be related to
the variable intake?

[The Cleaner]

Originally Posted by noncom23

So, in the 4.4, the throttle related whine, could it also be related to
the variable intake?

Not the same unit for the V8's, but they have a similar system that has a diaphragm that regulate exhaust gas,

[noncom23]

Originally Posted by The Cleaner

Not the same unit for the V8's, but they have a similar system that has a diaphragm that regulate exhaust gas,

Thanks.

[broknlgs24]

Originally Posted by The Cleaner

Not the same unit for the V8's, but they have a similar system that has a diaphragm that regulate exhaust gas,

could u elaborate a little more on this for me, please?
i tried searching RealOEM, but didn't have any luck.
thanks....