YOUR RESEARCHSqueak from Left hand bank of engine. Not ancillary belt
1 matching discussions were examined; no attributable action/outcome evidence was detected. No consensus or repair conclusion is claimed.
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Read captured repliesInsufficient extracted evidence does not mean there is no answer in the original discussions.
1 matching discussions · 9 captured posts examined · 0 partial discussions
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.
9 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
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0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261027T044418Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Be grateful for any advice here. Noise exactly like a pulley bearing, intermittent. Got car into garage and he's done idlers, tensioner, belt etc. However squeak is still there, even with belt removed, with car at rest. Seems to be coming from the top and of LH/NS engine bank. Engine starts and runs fine. Cheers Guy
This sounds just like mine, I have had 4 services in the time i've had the squeak and noone can find what it is. Does yours do it all the time or just when warm intermittently?
Doing it from startup.
AOS or secondary air pump might be worth a look.
Thanks folks, I'll look at AOS. There is no 2ry air pump.
Why would AOS make a screeching noise?
I haven’t watched the whole video yet but one of the technical experts here mentions the AOS noise and reasons it does it.
Thanks very much @ Pernicketybert , I recon this must be it, it is one of the only things I haven't replaced on this car, can't believe 4 separate "Porsche specialists" have been unable to diagnose this issue, not even suggested it as a possibility (and have charge me loads NOT solving the problem).
Sadly I no longer think it is the AOS, for two reasons: 1) I took the oil filler cap off with the engine running and the screeching didn't stop, although the engine went very lumpy. 2) It is not just at idle, happens a bit above idle too. Oddly, sometimes if I blip the throttle up to say 4 k it disappears for a short while.
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