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Discussion summary
YOUR RESEARCHchatter from the engine around 3K rpm when cold
Leading reported evidence
Replace tensioner pully
Performed · outcome unconfirmed
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0
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1
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Performed · outcome unconfirmed · Original poster
I had a similar sound on my BMW on cold starts before I replaced the tensioner pully.
Leading evidence: 'Replace tensioner pully' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace tensioner pully' (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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Suggestion
If it's chatter, it could be the little Germans that run on the treadmill to keep the variocam in sync.
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12 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
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Generation: 20261026T133652Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I get a chattering noise, not squeal, only around 3k RPM when driving the car during cooler mornings. Once the engine warms up, it goes away. Is it a pully?
You don't have a light weight flywheel (LWFW), do you? It does cause gear chatter under low RPM load (2.5k-3.5k) but usually only when the engine/transmission oil is warm.
It sounds like a bearing going bad. I had a similar sound on my BMW on cold starts before I replaced the tensioner pully. It does not happen when the engine is warm. Its not consistent and only in 1st gear..
My engine is 10K miles past its life span according to some experts though.
I would not have notice it if its consistent. It only happens when the engine is cold kept at 3k rpm. Sometimes it comes and at operating temp. Perhaps I can youtube it...
The idler pulleys will rattle/ching inconsistently.
The motor at 3k is probably at its harmonic resonance causing whatever making the noise to be more audible.
Once warmed, the metal expanding (whatever is causing the noise) causes the noise to go away.
If you can remove the airbox and accessory belt, spin the idlers and see if they are the culprit. They should spin smoothly, any crunchiness is a bad bearing.
This would be the easiest, quickest check.
