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.

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  • gatorfangary Aug 30, 2008

    Thank you very much for quick suggestion. Your advice makes sense, but unfortunately it's not the issue. The sound is not from the belts...they are fine.

    Seems to be some kind of air intake? or related bit? Any additional thoughts? Cheers G

  • Anonymous Sep 10, 2008

    im having the same problem with my z4, theres a high pitched ring/screech when I slightly accelerate. Any ideas?

  • Anonymous Jan 27, 2009

    I'm having the same issue. It happens when I press the accelerator about halfway down, it sounds like a very high pitched, faint whistling sound.

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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:
https://www.pelicanparts.com/BMW/catalog/shopcart/B134/POR_B134_BRKpad_pg2.htm#item4

Posted on Apr 23, 2009

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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,

Cheers

Posted on Aug 23, 2008

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Hi I have had the same prob with my 03 Z4 for nearly a yr now... initially got a main dealer recommendation that it was a cyclone valve.. then read on loads of forums that if this is suggested they are more than likely pulling a fast one!.. took it to a bmw specailist these suggested that it was the alternater belt pulley (not belt) this sounds logical as only occurs when engine is idling or slow enough for alternator to kick in.. was advised be about £275 for kit (belt and tensioners to fix).. havent doen this yet mind.

Posted on May 26, 2010

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