Planet-9

986 Boxster, supercharged - AOS failure and oil seepage

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4 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCH986 Boxster, supercharged - AOS failure and oil seepage

Leading reported evidence

Replace failed

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
failed and was replaced with a Porsche part along with all
Original post Read captured discussion
986 Boxster, supercharged - AOS failure and oil seepage

Frequently discussed work

Check on the

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
A quick check on the
Original post Read captured discussion
986 Boxster, supercharged - AOS failure and oil seepage

Read full discussion summary

Leading evidence: 'Replace failed' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'supercharger he/she is' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check on the' (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 · 4 captured posts examined · 1 partial discussions

Compare 4 other evidence results

supercharger he/she is

Suggestion or failed attempt

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
Correct me if I am mistaken but TPC is most likely the supercharger he/she is using (hence why not sold now).
Original post Read captured discussion
986 Boxster, supercharged - AOS failure and oil seepage

Check on the

Suggestion or failed attempt

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
A quick check on the
Original post Read captured discussion
986 Boxster, supercharged - AOS failure and oil seepage

Run beautifully

Suggestion or failed attempt

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
Car has run beautifully for several years.
Original post Read captured discussion
986 Boxster, supercharged - AOS failure and oil seepage

Test with the palm of your hand

Suggestion or failed attempt

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
There should be a a little vacuum driven by the plenum tested with the palm of your hand.
Original post Read captured discussion
986 Boxster, supercharged - AOS failure and oil seepage

Frequently discussed actions (5)

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

Check on the

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
A quick check on the
Original post Read captured discussion
986 Boxster, supercharged - AOS failure and oil seepage

Replace failed

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
failed and was replaced with a Porsche part along with all
Original post Read captured discussion
986 Boxster, supercharged - AOS failure and oil seepage

Run beautifully

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
Car has run beautifully for several years.
Original post Read captured discussion
986 Boxster, supercharged - AOS failure and oil seepage

Test with the palm of your hand

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
There should be a a little vacuum driven by the plenum tested with the palm of your hand.
Original post Read captured discussion
986 Boxster, supercharged - AOS failure and oil seepage

Use (hence why not sold now)

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
Correct me if I am mistaken but TPC is most likely the supercharger he/she is using (hence why not sold now).
Original post Read captured discussion
986 Boxster, supercharged - AOS failure and oil seepage

Reported and suspected causes (1)

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

supercharger he/she is

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
Correct me if I am mistaken but TPC is most likely the supercharger he/she is using (hence why not sold now).
Original post Read captured discussion
986 Boxster, supercharged - AOS failure and oil seepage

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.

4 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 · 1 excluded by outcome qualification · 0 adjusted by outcome qualification.

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

Generation: 20261027T042512Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1Original post

A friend who is not active on the web has a frustrating problem with his 1997 Boxster . The car has about 60,000 miles, Tiptronic, but with an aftermarket supercharger. Car has run beautifully for several years. About 2 years ago the AOS failed and was replaced with a Porsche part along with all AOS hoses. At the time the hoses seeped a little oil, but nothing significant. Now, with less than 1,500 miles added, the AOS has failed once more. His mechanic replaced it once again with a Porsche part, and the oil seepage has continued to occur. The mechanic, who is knowledgeable, is baffled and the owner is frustrated. We have speculated that the supercharger may be creating excessive crankcase pressure, and we might expect this on a 100k + engine. Can anyone shed light on possibilities. Grasping at straws, if the pressure will continue to cause AOS failures, is there a potential solution in installing a traditional PCV valve and a catch can?

POST 2Original post

I bet your speculation is correct. The 60K mile supercharged engine has blow-by pressurizing the crankcase. I am not aware of any threads that talk about replacing the AOS , but there is no reason that I can think of why a PCV and catch can would not work if you can find room for it. Good Luck!

POST 3Original post

A quick check on the AOS system is to open the oil filler cap while the engine is running. There should be a a little vacuum driven by the plenum tested with the palm of your hand. A lot of vacuum means that the AOS membrane is shot. While a positive pressure is a different matter most likely driven by compression ring failure.

POST 4Original post

The TPC 986 S/C system was poorly designed. Correct me if I am mistaken but TPC is most likely the supercharger he/she is using (hence why not sold now). Anything added at this point is band-aid and probably will not even fit due to the space constraints. I had a similar problem involving a Novi 2k on a 3.8L v6 engine and had to redesign the PCV routing and had proper spacing. The PCV system hasn't been functioning in a closed loop system as Porsche has designed, could of lead to head wear and blow by. Best to take the supercharger off, sell those parts, and hope the car behaves as designed or the engine is toast. Pay to play. Hopefully not the original owner since those are fun cars but worth nearly nothing.

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