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oil separator o-ring?

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I recently replaced a failed AOS (first-timer). It's the newer version so I also replaced the j-tube. The website I ordered from said I also needed one o-ring (which I ordered) but I couldn't figure out on which connection it was to be used. The j-tube already had one at each end. So I left the o-ring off, but the idle is now high (1100rpm) and has stayed that way over a few days of driving.


1. where does this one o-ring go?

2. could this be the cause of my high idle?

3. If not the cause....any ideas?

Oh...it's a 1997 Boxster :)


Edited by acupunk
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the O ring on the originals went on the end of the return tube which insterted into the block, on the newer style it goes on the tube that into the top of the cylinder head and yes if you don't get that sealed you will have the higher rpm

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