Planet-9

Failing Vacuum Pump?

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YOUR RESEARCHFailing Vacuum Pump?

Leading reported evidence

Use stethoscope

Performed · outcome unconfirmed

No successful repair reported for this finding.

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Reported fixes: 0
Unsuccessful attempts: 1
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Discussions that performed work without a confirmed outcome: 1

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Performed · outcome unconfirmed
I'm pretty sure it's the vacuum pump, I used a stethoscope under the car while it was running and it was there even at idle, everything else is silent, other than a little valve train noise.
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Failing Vacuum Pump?

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Leading evidence: 'Use stethoscope' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Use stethoscope' (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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Frequently discussed actions (1)

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Use stethoscope

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that performed work without a confirmed outcome: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed
I'm pretty sure it's the vacuum pump, I used a stethoscope under the car while it was running and it was there even at idle, everything else is silent, other than a little valve train noise.
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Failing Vacuum Pump?

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

Planet-9: 1 discussions

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Generation: 20261026T130754Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1Original post

My vacuum pump on my '06 Cayman seems to have a tick/knock. It's only noticeable while driving, it's completely silent while idling, and it's more noticeable when the engine is warm. It sounds like very early rod knock. Is it typical to be able to hear something like this? The car had bore scoring when I got it, so I never drove it prior to rebuilding the engine. I don't really know what a "normal" M97 sounds like. It's not a loud knock, if I stick my head out the window I can't hear it from the outside, it just seems to be amplified a bit in the cabin. I'm pretty sure it's the vacuum pump, I used a stethoscope under the car while it was running and it was there even at idle, everything else is silent, other than a little valve train noise. I've read accounts of it making a rod knock-like sound upon failure, but that seems to be after it fails, no mention of sounds leading up to failure. I'm probably going to change it. I don't like when an engine I just built makes a knocking sound. Just wondering if this is an immediate concern, or if I can let it ride until the next oil change or so.

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