[steel609]

Sound on my 2010 BMW E92 a day after replacing valve cover and gaskets, new flex disks front and rear and the center support bearing.

It does clear up after driving awhile, but never goes completely away. No codes thrown, no loss of performance and no vibrations.

Any suggestions???

[steel609]

No guesses?

[King Rudi]

Does Bubb Rubb live close to you? He's a sneaky bastard!

In all seriousness, I've only heard this come from these things.



Beautiful ride btw! You have inspired me to get those kidneys for my E93. Been on the fence about getting them until I had seen them on someone else's ride.

[steel609]

Crazy that no one has ever heard this sound.

[MysticRob]

Why not open the hood and poke around where you did the work with a cell phone video instead of far away outside still shots?

You didn't have the sound prior to the work, right?
After changing out the VC and gaskets you do have the sound?
I'll take a stab in the dark and say it's related to that work. Recheck your work and you'll likely find the issue.

[steel609]

Originally Posted by MysticRob

Why not open the hood and poke around where you did the work with a cell phone video instead of far away outside still shots? I made the sound recording for myself to try and diagnose the issue, a video would just show the inside of my car as there is nothing inside pointing to an issue. It does not make the noise stationary even under high RPM's.

You didn't have the sound prior to the work, right? Correct.
After changing out the VC and gaskets you do have the sound? It was not making the sound when I left the garage where the work was performed. The sound started the next day after I changed the oil and replaced the OFHG.
I'll take a stab in the dark and say it's related to that work. Recheck your work and you'll likely find the issue.

I took it back to the shop and my mechanic said he has never heard this sound before and he worked at BMW for 10yrs before opening his own shop. He did suggest it sounded vacuum related, possibly a bad vent hose, but i really don't want to pay for guesses and hoping someone else may have heard this before to either confirm the issue or point in right direction.

I appreciate your help!

[6ixSpd]

Woooooooooo!!!!

[MysticRob]

Originally Posted by steel609

I made the sound recording for myself to try and diagnose the issue, a video would just show the inside of my car as there is nothing inside pointing to an issue. It does not make the noise stationary even under high RPM's.

It was not making the sound when I left the garage where the work was performed. The sound started the next day after I changed the oil and replaced the OFHG.

So it doesn't make the noise while stationary. When/how does it make the noise while moving then? Hitting throttle slightly, lifting off throttle, under boost, etc?

Logic dictates the shop's work isn't suspect, only your own, so check the OFHG and related components you already touched around that area. Is the ole "710" cap tight, new oil filter and o-rings correct type and installed correctly, etc?

[steel609]

Originally Posted by MysticRob

So it doesn't make the noise while stationary. When/how does it make the noise while moving then? Hitting throttle slightly, lifting off throttle, under boost, etc? Only starts around 20mph. Shifting to neutral at that speed does not change the sound.

Logic dictates the shop's work isn't suspect, only your own, so check the OFHG and related components you already touched around that area. Is the ole "710" cap tight, new oil filter and o-rings correct type and installed correctly, etc?

I even had my mechanic look at my work, no problems there.

It could just be coincidence that it started around same time as other work.

I have had one thought, the exhaust bolts were very rusted and he needed a torch to loosen them up enough. Is it possible that there may be a leak there causing the sound?

[maxoutput]

Try removing the oil cap and see if the noise gets worse as it kind of sounds like vacuum pressure building in the crank case due to blocked crank case ventilation.

[e90coast]

Mught be the sound of the police

[steel609]

Originally Posted by maxoutput

Try removing the oil cap and see if the noise gets worse as it kind of sounds like vacuum pressure building in the crank case due to blocked crank case ventilation.

We tried that with no change. It doesn't make the noise stationary, only starts around 20mph.

[King Rudi]

Originally Posted by e90coast

Mught be the sound of the police

[kfrazie1]

This sounds like a loose hose to me. Are you able to make full boost?

[Alloyed]

I had a similar noise in my 3 Series shortly after I purchased it. The dealer had someone ride along with me to hear it, and they eventually determined it was the "vacuum return line" that was responsible for the whistling noise. They replaced the line and the sound went away. Hope that helps.

[steel609]

Originally Posted by Alloyed

I had a similar noise in my 3 Series shortly after I purchased it. The dealer had someone ride along with me to hear it, and they eventually determined it was the "vacuum return line" that was responsible for the whistling noise. They replaced the line and the sound went away. Hope that helps.

Do you have any idea which exact line it was?

[Alloyed]

The printout the dealer gave me mentioned "vac line to exhaust valve".

The printout also mentions they removed the following items to replace the line: "Driver side lower trim panel, driver side kick panel, still plate, driver rear still plate, rear seat trim, left rear trunk carpet."

After that they "ran new vac line from exhaust valve in left rear trunk to front of engine vac source. reinstalled all trim and test drove noise gone."

I corrected a couple small spelling errors, but that is pretty much what they wrote on my service printout.

That's all the info I have, but I'm not sure how much help that will be; I think we have different engines in our cars. Perhaps someone else could chime in?

[steel609]

Originally Posted by Alloyed

The printout the dealer gave me mentioned "vac line to exhaust valve".

The printout also mentions they removed the following items to replace the line: "Driver side lower trim panel, driver side kick panel, still plate, driver rear still plate, rear seat trim, left rear trunk carpet."

After that they "ran new vac line from exhaust valve in left rear trunk to front of engine vac source. reinstalled all trim and test drove noise gone."

I corrected a couple small spelling errors, but that is pretty much what they wrote on my service printout.

That's all the info I have, but I'm not sure how much help that will be; I think we have different engines in our cars. Perhaps someone else could chime in?

I have the N51, so no turbo or exhaust area flap.

I did notice something new yesterday. If I accelerate at a slow pace, very gently, and then slowly increase speed it doesn't make the noise. I'm not talking unusually slow starts, more like a cautious driver would.

[steel609]

Today it made the noise as soon as I hit the street and nothing I did would make it stop.


So damn frustrating.

[Cutch42]

Apologies for digging up an old thread but was this ever solved? Getting a similar noise at various speeds, started happening after replacing the CSB (was originally vibrating under load but no woo noises) so I then I thought it was the diff but replaced that and still get the woo woo noises.