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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHNew Porsche AOS reading 5.3 WC - opinions?? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Leading reported evidence
Check vacuum
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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1
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Performed · outcome unconfirmed · Original poster
I finally checked the vacuum with the car fully warmed up.
New Porsche AOS reading 5.3 WC - opinions?? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'Check vacuum' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check air oil separator' (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.
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 contain suggestions
1
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0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
We check the AOS on every car passing through the shop, regardless what it is in for.
New Porsche AOS reading 5.3 WC - opinions?? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace ver.00 aos
Suggestion or failed attempt
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 contain suggestions
1
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0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
After replacing my ver.00 AOS with a new Porsche Genuine AOS ver.01 I was disappointed to find that the new AOS was still reading between 6.21 and 7.28 inWC.
New Porsche AOS reading 5.3 WC - opinions?? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Test either
Suggestion or failed attempt
No successful repair reported for this finding.
0
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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 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 digital manometer can read both pressure and vacuum very accurately, so anywhere you would be testing either.
New Porsche AOS reading 5.3 WC - opinions?? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Test routinely done as part of a ppi
Suggestion or failed attempt
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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 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.
New Porsche AOS reading 5.3 WC - opinions?? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace ver.00 aos
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 · Original poster
After replacing my ver.00 AOS with a new Porsche Genuine AOS ver.01 I was disappointed to find that the new AOS was still reading between 6.21 and 7.28 inWC.
New Porsche AOS reading 5.3 WC - opinions?? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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.
13 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
986Forum: 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: 20261026T124918Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
After replacing my ver.00 AOS with a new Porsche Genuine AOS ver.01 I was disappointed to find that the new AOS was still reading between 6.21 and 7.28 inWC. Pretty much what the old one was reading. Here’s my original thread:
http://986forum.com/forums/performance-technical-chat/69866-if-ain%92t-broke-don%92t-fix.html
Not trusting my $35 manometer, I ordered a Fieldpiece manometer. With the Fieldpiece my new AOS is reading in the high fives cold and 5.32 - 5.41 warm. The cheap manometer is off by ~1 inWC
JFP indicated that anything above 5.0 warm is candidate for replacement. The Pelican article says 4-7 is ok. I think I’m going to call it good at 5.32, watching for symptoms and monitoring WC regularly. I really don’t want to go back in and risk breaking the AOS plastic squeeze clamps unless I really need to.
What do you guys think???
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4-7 is OK on a cold start, but 5 is our limit warmed up. Yours is marginal, so I would leave it alone, but check it regularly to see if starts going up.
Nice manometer by-the-by.....
Hi JFP, thanks for the quick response. Good news! I’ll leave it and monitor. At least I’m within spec for the cold start and now I have the latest version.
The Fieldpiece is awesome, thanks. I know better than to try and cheap out on important equipment but I slip sometimes.
Quick update. I finally checked the vacuum with the car fully warmed up. As JFP advised, it’s just like the cam variance - only check it when the car is truly at operating temp after a good run. My new AOS is well in spec:
Done!
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I have owned 996’s and a 997, but I am not familiar with this AOS test.
I am having a PPI done next week on a 986. Is this test routinely done as part of a PPI? If not, do I just request an AOS manometer test?
Thanks.
A digital manometer can read both pressure and vacuum very accurately, so anywhere you would be testing either. Its major advantage is in the fact that it can read very low levels of either.
