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Testing (internally modified) AOS?

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YOUR RESEARCHTesting (internally modified) AOS?

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Test aos outside of the car

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Suggestion · Original poster
- Is there a way/procedure for testing the AOS outside of the car?
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Testing (internally modified) AOS?

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Leading evidence: 'Test aos outside of the car' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Test aos outside of the car' (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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Test aos outside of the car

No successful repair reported for this finding.

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Reported fixes: 0
Unsuccessful attempts: 1
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Discussions that contain suggestions: 1

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

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Suggestion · Original poster
- Is there a way/procedure for testing the AOS outside of the car?
Original post Read captured discussion
Testing (internally modified) AOS?

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POST 1 / ORIGINAL POSTEROriginal post

Hi, question, after a cracked head, I've taken out the engine of my 996. One of the things I'd like to check is the AOS. The engine was rebuilt �3.5kkm ago, the invoice of that rebuild says 'AOS internally modified'. This leads me to 2 questions; - Anyone has a clue if and how an AOS can be 'internally modified'? It seems that the part of the housing that contains the diaphragm, has been opened before. - Is there a way/procedure for testing the AOS outside of the car? Thanks for your advice!

POST 2Original post

Quotes source post: 20324204

I definitely have a clue but lots of questions... Can you post the Invoice ? I'd like to see the name of the shop and the cost/details of the internal mod ...Could be an attempted copycat... Does you car have an additional Flow Control on the AOS system or additional piping/components ?? Maybe a picture of the complete Crankcase Ventilation System will be needed to identify what you have installed... Why are you wanting to test it ???

POST 3 / ORIGINAL POSTEROriginal post

As a matter of principle I don't share names on the interwebs, but it was a Dutch specialist who specalizes in 996 type engines. Perhaps that gives you enough to go by? The tubing and plumbing is 100% identical to OEM and the outside too. I could post a picture, but that'd take some time because I have to go to the garage and it'd look exactly like original.. Reason for testing... the infamous 'while I'm at it'

POST 4Original post

Being Dutch doesn't tell me anything .. Everything else being 100% OEM does tell the tale.. Although I do remember a Dutch guy who was disabling the diaphragm and routing the plumbing to Vent to the Air Cleaner Box...

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