[G-M5]

Anyone with input on this sound car makes at startup. It doesn't happen after car is fully warmed up and has been drives.

https://youtube.com/shorts/Dgos6uvMqLw?feature=share

[boost3dx]

you should upload the video to you tube or something

[G-M5]

Originally Posted by boost3dx

you should upload the video to you tube or something

https://youtube.com/shorts/Dgos6uvMqLw?feature=share

[Jakerx]

I’m sorry, it could be my phone’s speakers but I don’t hear anything abnormal in that video. Perhaps you can have some one hold it where you believe the nose is coming from while you start her up?

[G-M5]

Originally Posted by Jakerx

I'm sorry, it could be my phone's speakers but I don't hear anything abnormal in that video. Perhaps you can have some one hold it where you believe the nose is coming from while you start her up?

It's towards the end there is a humming grinding sound.

[boost3dx]

I can hear it. No idea what that is, but between my cars, my dads, we've had 3 M5s and I've never heard this. I don't believe it to be normal, I'd take it to the dealer.

[Evil Derboy]

Sounds like an electric motor of some kind. Like the sound the wing mirrors make when they fold out. It's definitely not normal.

[Aronis]

sounds like mirror motor, see if they fold and unfold properly, there is a button you can push on the door.

Mike

[JakeW1990]

I concur with the others. Sounds like the mirror motor is acting up. I'd try and troubleshoot that.

[G-M5]

Originally Posted by JakeW1990

I concur with the others. Sounds like the mirror motor is acting up. I'd try and troubleshoot that.

Its not motor motor because i hear that inside cabin with windows rolled up. Its a buzzing sound that looks like it's coming up under the car

[JakeW1990]

Originally Posted by G-M5

Its not motor motor because i hear that inside cabin with windows rolled up. Its a buzzing sound that looks like it's coming up under the car

It's hard to tell with the audio that's provided and the visual reference the camera is pointed. Might just need to swing it by your local service department and see what they say.

[G-M5]

Originally Posted by JakeW1990

It's hard to tell with the audio that's provided and the visual reference the camera is pointed. Might just need to swing it by your local service department and see what they say.

Will try shooting another video. But yea I'll have a shop foreman take a look at it.

[Aronis]

does door have 'soft close'? that has a motor too. if drivers door not fully closed it will auto close.


Mike

[G-M5]

Originally Posted by Aronis

does door have 'soft close'? that has a motor too. if drivers door not fully closed it will auto close.


Mike

Its a noise that comes from bottom of engine. Almost like a 4x4 being initiated. It doesnt happen when car has been driven.

[G-M5]

Here is another clip.

[boost3dx]

I get a similar sound upon start up that I believe is the fuel pump or something similar. It doesn't sound like that though, so maybe whatever your issue is, is the same thing but its on its way out?

[G-M5]

Originally Posted by boost3dx

I get a similar sound upon start up that I believe is the fuel pump or something similar. It doesn't sound like that though, so maybe whatever your issue is, is the same thing but its on its way out?

It gives a judder in brake pedal. So im not sure what exactly is it. Some said its a brake booster but im not sure.

[Aronis]

Ok, now I am dying to find out what it is....

Mike

[G-M5]

Originally Posted by Aronis

Ok, now I am dying to find out what it is....

Mike

Was told it has to do with hpfp so lets see what happens.

[Danny D]

All normal sounds.
I can even tell that was a cold start up turn off and another cold start up - since the lifters and pump are making those noises and they go away after about 1 minute correct ?

[G-M5]

Originally Posted by Danny D

All normal sounds.
I can even tell that was a cold start up turn off and another cold start up - since the lifters and pump are making those noises and they go away after about 1 minute correct ?

That noise only comes up few min after cold start. If you restart the car or after being warmed up RPM dips below 600ish the humming start again.

[micvite]

Originally Posted by G-M5

That noise only comes up few min after cold start. If you restart the car or after being warmed up RPM dips below 600ish the humming start again.

Sounds most like your hpfp or transfer case to me, could be abs or something else though. When you hear the noise does it change anything if you give it some gas or is the noise irrespective of engine rpm?