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Disturbing monotonous sound


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Greetings, I am seeking assistance from anybody here. For the last several months, I have been experiencing a persistent low-frequency noise inside the car while driving at speeds above 30mph. The intensity of the noise varies depending on the condition of the road, with little noise noticeable on smooth surfaces. I have recently replaced the front bearings, ball joint, and front springs due to damage. Despite these repairs, the noise I am experiencing continues to persist. I have extensively inspected the suspension system, but I am currently unable to determine the source of the problem.

Has anybody had similar problems? It is causing me significant frustration.

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Instruct the spouse to occupy the rear seat ... 🤣

In my E46 320cd, I had a similar issue where the door window was not properly sealing. Despite the fact that your situation also involves a change in pitch with the road surface, the root cause may be different. The issue was resolved by replacing the seal.

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Are you referring to the rear differential? I would have expected it to be more coherent when combined with velocity, but it would be worthwhile to give it a go with the rear wheels elevated, even if it's only to exclude it as a possibility.

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Thank you for the responses, but it is certainly not caused by my wife, since the issue occurs even when she is not around. Furthermore, I have just had the differential mounts changed, and I have not had any problems with the differential.

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Posted (edited)
The noise I am experiencing is not caused by the tyres. I have already tried two other kinds of tyres, and the issue was not there with the prior set. Currently, I have fresh new Continental Eco 6 tyres, but the problem remains unchanged. The sound resembles the act of someone exhaling forcefully over the aperture of an unsealed container, if that is comprehensible.
Edited by Psychil
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No one can perceive the sound, since it is not a continuous high-pitched noise like that of a bearing. Rather, it resembles the unpleasant melody produced by someone playing a song on a bottle cap. The volume of the sound varies depending on the condition of the road.

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Possible sources of the noise might include holes in the body, wing mirrors, or even the wipers. To troubleshoot, I suggest using a low-cost roll of masking tape to cover one door at a time. If the sound stops, gradually remove pieces of tape until the sound returns.

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