Question about 2004 BMW Z4

3 Answers

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.

Posted by on

  • 1 more comment 
  • 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.


3 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    An expert who has written 50 answers of more than 400 characters.


    An expert whose answer got voted for 20 times.

  • Expert
  • 157 Answers

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:

Posted on Apr 23, 2009

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    An expert whose answer got voted for 20 times.


    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 120 Answers

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

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

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

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

High pitch noise when decelerating

jack vehicle up and rotate one wheel at a time to see if noise is present, let me know what you find

Dec 18, 2015 | 2002 Toyota Corolla

1 Answer

My tahoe has a high pitched sound when I accelerate

I had that sound in my Acura. The transmission was low on oil.
Hope this helps.

Sep 12, 2014 | 2006 Chevrolet Tahoe

1 Answer

Rear squealing noise when accelerating.

nothing to do with breaks sounds more like a u joint or bearing

Nov 25, 2012 | 2003 Toyota RAV4

2 Answers

I have a 2003 Jeep Wrangler that has a high pitch SQUEALING sound when I release the accelerator. Any ideas what's causing it or how to fix it?.

I know i have the same problem, and i also noticed than when i open the Hood the whistle just stops, so i figure out it must be some air cycling in or out osmewhere, I found out my air intake connected to throttle body was misplaced a weird gap was left open allowing air to whistle. u might wanna check there

Sep 19, 2012 | 2003 Jeep Wrangler

1 Answer

When slowing down high pitch noise Hyundai i30 2011

your drivetrain is screaming already. Hope for the best.

Jul 20, 2012 | 2011 Hyundai i30 1.6

1 Answer

What would cause whistling noise near pully and belt area noise gets louder with acceleration

The engine serpentine belt may be worn or wet. The belt slips, causing a high pitched squealing or whistle noise. The other possiblility is a bearing beginning to go out on one of your belt driven components

Mar 27, 2012 | 1999 Pontiac Montana

1 Answer

I hear some kind of wobbly oscillating noise which seems to come from underneath, front passenger side (right hand drive) during accelerating from stationary. The noise oscillates faster as vehicle pick...


Aug 11, 2010 | 2004 Volvo XC90

2 Answers

Noise from engine

Check your belt. Belts will whine when they're worn, cracked or glazed. I hope this was helpful. It's not normal. Take care and God bless.


Feb 05, 2010 | 2004 GMC Envoy

2 Answers

Squealing noise Upon slow acceleration

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

May 27, 2009 | 2004 BMW Z4

1 Answer

High pitched electronic/dentist drill sound when accelerating.

Probably the front differential, your probably hearing the famous differential gear whine. Change the oil, put Lucas for gears in it. You can get a hand operated oil pump to **** it out through the dip stick if it has one. Then fill it with the recommended amount.

May 06, 2009 | 2007 Nissan Xterra Off Road

Not finding what you are looking for?
2004 BMW Z4 Logo

1,516 people viewed this question

Ask a Question

Usually answered in minutes!

Top BMW Experts

Frankie B

Level 2 Expert

65 Answers

Fred Sops

Level 2 Expert

272 Answers


Level 2 Expert

254 Answers

Are you a BMW Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides