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Planet-9

Weird whistling noise from engine.

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Original source
14 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHWeird whistling noise from engine.

Reported or suspected cause

fuel pump going out

Reported cause

No successful repair reported for this finding.

1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that report identifying a cause
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.

Reported cause

Last time I heard a whistling noise it was the fuel pump going out.

Original post Read captured discussion
Weird whistling noise from engine.
Frequently discussed work

Replace last month

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

Just got mine replaced last month.

Original post Read captured discussion
Weird whistling noise from engine.
Read full discussion summary

Leading evidence: 'fuel pump going out' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'fuel pump going out' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Replace last month' (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.

Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.

Read captured replies

1 matching discussions · 14 captured posts examined · 1 partial discussions

Compare 4 other evidence results

Replace last month

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

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

Just got mine replaced last month.

Original post Read captured discussion
Weird whistling noise from engine.

Test with ac

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

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

Doesn't go with the fans, tested with AC on and off.

Original post Read captured discussion
Weird whistling noise from engine.

aos (air-oil-seperator), ie pvc system device

Suggestion or failed attempt

No successful repair reported for this finding.

0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that suspect a cause
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.

Suspected cause

I think if you take the time to read the thread - it seems most people - the issue is a failing AOS (Air-Oil-Seperator), ie PVC system device.

Original post Read captured discussion
Weird whistling noise from engine.

aux air pump

Suggestion or failed attempt

No successful repair reported for this finding.

0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that suspect a cause
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.

Suspected cause

But seriously, if its only for the first 90 seconds or so when you start the car cold in the morning, its most likely the aux air pump.

Original post Read captured discussion
Weird whistling noise from engine.
Frequently discussed actions (3)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Replace last month

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

Just got mine replaced last month.

Original post Read captured discussion
Weird whistling noise from engine.

Test with ac

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

Doesn't go with the fans, tested with AC on and off.

Original post Read captured discussion
Weird whistling noise from engine.

Use tapatalk

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
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.

Suggestion

Sent from my iPhone using Tapatalk

Original post Read captured discussion
Weird whistling noise from engine.

Suggestion

using Tapatalk

Original post Read captured discussion
Weird whistling noise from engine.

Suggestion

Sent from my iPhone using Tapatalk

Original post Read captured discussion
Weird whistling noise from engine.
Reported and suspected causes (3)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

fuel pump going out

No successful repair reported for this finding.

1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that report identifying a cause
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.

Reported cause

Last time I heard a whistling noise it was the fuel pump going out.

Original post Read captured discussion
Weird whistling noise from engine.

aos (air-oil-seperator), ie pvc system device

No successful repair reported for this finding.

0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that suspect a cause
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.

Suspected cause

I think if you take the time to read the thread - it seems most people - the issue is a failing AOS (Air-Oil-Seperator), ie PVC system device.

Original post Read captured discussion
Weird whistling noise from engine.

aux air pump

No successful repair reported for this finding.

0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that suspect a cause
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.

Suspected cause

But seriously, if its only for the first 90 seconds or so when you start the car cold in the morning, its most likely the aux air pump.

Original post Read captured discussion
Weird whistling noise from engine.
Coverage and how to read this overview

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.

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

  • Planet-9: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

0 acknowledgements have no verified action link; they do not establish a repair result.

Generation: 20261027T201111Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1Original post

Anyone have any idea what this is? Jan 24, 2014 - YouTube Sent from my iPhone using Tapatalk

POST 2Original post

Its whistling because it doesn't know the words. But seriously, if its only for the first 90 seconds or so when you start the car cold in the morning, its most likely the aux air pump. The bearings wear and make a whisteling noise or a noise like the tiniest buzz saw.

POST 3Original post

It's not during startup and it's not always there. It comes and goes. Doesn't go with the fans, tested with AC on and off. Sent from my iPhone using Tapatalk

POST 4Original post

I had a whistling noise like yours but only at idle when the revs were low. Was most noticeable after driving the car hard for a while and then it would appear at idle. Increase the revs by 200 revs and it would go away. Diagnosed and corrected by the dealer as an Oil Separator failure. :cheers:

POST 5Original post

Ok. I'll look into that. What's an oil separator though? Sent from my iPhone using Tapatalk

POST 6Original post

Last time I heard a whistling noise it was the fuel pump going out. If not that your probably channeling Casablanca.:banana:

POST 7Original post

Do you have a picture of the oil separator? Thanks. Sent from my iPhone using Tapatalk

POST 8Original post

Sounds like AOS. Just got mine replaced last month. Does yours come on when warm? Mine didn't when it was cold.

POST 9Original post

Mine only whistled at low revs at idle. When cold the revs were higher. It was only after a drive when the car was fully warmed up and sitting at idle. :cheers:

POST 11Original post

3 AOS failures in 11 years & all sounded just like yours.

POST 12Original post

I guess that's what's wrong on my gf's cayman then. The noise has gone away for a month. We'll replace it when the noise comes back. Thanks all! Sent from my iPhone using Tapatalk

POST 13Original post

Hey man, so what was the problem? I have this whisteling noice when car get's warmer. It gets louder by a level when engine is warmer.

POST 14Original post

I think if you take the time to read the thread - it seems most people - the issue is a failing AOS (Air-Oil-Seperator), ie PVC system device. The part isn't expensive and it's certainly a DIY item (we have a number of threads on it), but it does take some time to replace it and probably some busted knuckles.. if that's something you enjoy doing- then have at it and let us know how it worked out for you... Also - welcome to Planet-9, the Friendly Porsche Forum... when you have a chance, please visit New Member Introductions and post some pictures of your 987, and tell us a bit about yourself! Welcome again!

This is a source reference. Confirm exact model applicability in the original material.