Question about 2004 BMW Z4

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Squealing noise Upon slow acceleration

I 'm getting this high pitch screaching sound when slowly accelerating, it's not heard when no accelerator action or putting foot down pretty well. The noise is almost like a metal sharpening grinder. ANy advice or assitance most welcomed. I have the same issue I don't think it has anything to do with brakes front or rear, it still makes the noise while stationary and is definitely coming from engine bay. I took it to two garages both of whom said they didn't think it was mallicious but would need to start stripping it down to locate. No thanks! One dealer did go so far as to suggest it could be the throttle housing but that's a bit of a guess really I'd love to hear from someone who managed to fix this. Very annoying! For the record mines a 2003 2.2 Thanks!

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Hi, i have a bmw 316 1.9ltr and recently mine has had a high pitch squeel almost a screaching sound from the engine bay, after allot of investigation i found it not to be the the serpentine belt it actually was a crank case breather valve, when the vacuum of the engine gets to much it starts screeching, when you pull the engine oil dip stick out, it stops and you can hear it sucking in air, you could always try taking off the oil filler cap when it starts screeching when i say try, it is realy realy hard to pull off, give it a try you will find out if its that then, it also could be what daftdad said it might be the belt or an ideler bearing....hope this helps

Posted on Feb 04, 2010

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Have you had the alternator or fan belt checked as they will squeel when they are loose and you accelerate.
This may not be the problem but it is a cheap fit if it is the problem.
hope this has helped

Posted on May 27, 2009


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SOURCE: Squealing noise Upon slow acceleration

First I would check your fan belt, check to see if it is loose by pushing down on the the belt, should only be a slight movement. Look at the belt to see if it i shine if it is belt should be replaced. You can buy a can og belt dress, just spray on to belt on then see if you still get the noise. if you don't then you know for sure that its the belt. Keep us info about how this works,


Posted on Aug 23, 2008

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Squealing noise Upon slow acceleration

Hey- I have the exact same problem with my Z4 although its a 06 as opposed to an 04. I took it to the shop and was told it was break dust covering the break sensors. They removed my rear calipers and rotors, cleaned and greased the brakes. So far I havent had the sound again. Doesnt it feel so weird to be driving around with the top down on a nice day then slow down at a red light and be accosted with such a horrible sound like that? It drove me absolutely nuts. It went from a light sound only when I was barely accelerating (like trying to find a parking spot) to a bit of a scratchy metal sound which is why I think the problem may apply to you as well.

On a side note, I am also told by a friend of mine who is also a bimmer guy that it might be due to the brake pads vibrating back and forth inside the brake caliper. He suggests checking out a $2 investment in a product called Plastilube which will stop the noise. I did a quick search and you can purchase it by going to:

Aug 23, 2008 | 2004 BMW Z4

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