this post was submitted on 17 Aug 2023
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Mechanic Advice

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Weird cyclic sound when accelerating, like a ball in a washing machine (self.mechanicadvice)
submitted 1 year ago by blacksoul to c/mechanicadvice
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Hello, I have a problem with my car. It started about a month ago. A weird humming sound starts randomly, usually in the first minutes of starting the car. Lately, it was getting triggered by my first sharp turn to the left. After some time the sound just goes away.The more I accelerate, the quicker the sound, but it doesn't get stronger or sharper. The noise was really faint initially, but it got a bit louder these past days. The mechanic didn't find anything weird with the car. The wheels are well attached (apparently). At the time he wasn't able to reproduce it so he just told me to bear with it, but now it's a bit louder so I am getting nervous.

Here are 2 links for the sound output from inside the car, one for the old noise and one for the new one:

https://whyp.it/tracks/115868/old-sound?token=bZjFm

https://whyp.it/tracks/115869/new-sound?token=01Yug

Any ideas what that would be?

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[–] jrwperformance 1 points 1 year ago* (last edited 1 year ago) (1 children)

Hard to guess with only sounds and not knowing what kind of car...but sounds like it could be a center support bearing for a driveshaft...does the sound increase in frequency with vehicle speed or with engine RPM?

[–] blacksoul 1 points 1 year ago (1 children)

It’s a automatic Mazda 3. It increases with the speed. At a fixed speed, when it changes gears, the sound stays the same.

[–] jrwperformance 1 points 1 year ago

Need to look at everything that spins at wheel speed. Brakes, wheel bearings, CV shafts, CV shaft support bearing (if it has one).