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Weird Buzzing noise (video in post)

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YOUR RESEARCHWeird Buzzing noise (video in post)

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Replace thinking

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Performed · outcome unconfirmed · Original poster

Had front 2 wheel bearing replaced thinking that was the issue, rears have been checked and are fine

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Weird Buzzing noise (video in post)
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Leading evidence: 'Replace thinking' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace thinking' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

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Replace thinking

No successful repair reported for this finding.

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Reported fixes
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Discussions that performed work without a confirmed outcome
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0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

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Performed · outcome unconfirmed · Original poster

Had front 2 wheel bearing replaced thinking that was the issue, rears have been checked and are fine

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Weird Buzzing noise (video in post)
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Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

4 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

  • Rennlist: 1 discussions

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Generation: 20261027T022239Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Hi All, So my new to me 2003 996TT with 62k miles is making a weird noise. its a cross between a high pitch hum, a weed-whacker, and a cicada. Heres the breakdown Only noticeable with windows down and driving next to something like a wall to reflect the noise Had front 2 wheel bearing replaced thinking that was the issue, rears have been checked and are fine Does not modulate with engine RPM Occurs even while coasting down a hill in neutral You cannot hear it inside the car while stopped but if you get out I think you can hear it coming from the rear Brakes do not seem to modulate the noise The car does have headers and an unknown aftermarket exhaust, a vflow intake box, and a GIAC tune. The first clip was taken while coasting down a hill in neutral, the wind noise is annoying but from 28-31 seconds you can really hear the noise, its sounds like a breeze blowing but thats really just whatever this noise is. https://www.dropbox.com/s/tlm8ej7ela..._0003.mp4?dl=0 The second clip I took while idling, it seems like its the same noise perhaps? Again at the end of the video you get a good listen to it. https://www.dropbox.com/s/ekh8hqy2e4..._0004.mp4?dl=0 Any ideas?

POST 2Original post

The sound quality is horrible but it could be one of your catalytic converters (sounded like a rattle to me). But it's tough to hear the noise over the turbos so you might want to try the 996TT forum. Their ears can hear past the whine a little more naturally then us NA guys.

POST 3 / ORIGINAL POSTEROriginal post

The more I hear it I think it may be a pulley, it seems to vary very very slightly with engine RPM.

POST 4 / ORIGINAL POSTEROriginal post

Spoiler alert - its the front diff bearings. This will not be cheap...

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