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AOS Cutaway - Boxster


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I would like to know how a Porsche Boxster air/oil separator works, and how it is made. Does it have components that can be damaged or wear out, plugged up, etc? Is there any way a DIY'er can test an AOS? Replacing the AOS appears to be a tough job, so I would like some assurance the AOS is faulty.

I suspect the AOS on my 2000 Boxster 2.7 Tiptronic may be "messed up" because I overfilled the sump when I changed the oil about 10k miles ago. The CEL light is on and Auto Zone says the codes are P0401, P1128, and P1138. The car runs great, gas mileage is normal. The only symptom is the engine surges at idle on start up, then returns to normal after it warms up. And, the car has started making a cloud of bluish smoke that smells like oil almost every time the engine is started. And, the surging seems to be getting less and less with time.

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I would like to know how a Porsche Boxster air/oil separator works, and how it is made. Does it have components that can be damaged or wear out, plugged up, etc? Is there any way a DIY'er can test an AOS? Replacing the AOS appears to be a tough job, so I would like some assurance the AOS is faulty.

I suspect the AOS on my 2000 Boxster 2.7 Tiptronic may be "messed up" because I overfilled the sump when I changed the oil about 10k miles ago. The CEL light is on and Auto Zone says the codes are P0401, P1128, and P1138. The car runs great, gas mileage is normal. The only symptom is the engine surges at idle on start up, then returns to normal after it warms up. And, the car has started making a cloud of bluish smoke that smells like oil almost every time the engine is started. And, the surging seems to be getting less and less with time.

I’d like to know about the aos works too. I kinda get tired of replacing whole component assemblies ($$$) when it’s usually some really small easy to fix or replace what’s-it.

Your blue smoke is oil burning (white is water, black is way to rich( irrelevant with cats). Did you drain out the excess when you realized your mistake? I f not, your surge could be the result of excess oil accumulating where it’s not supposed, burning (obviously) and maybe affecting the readings in the injection feedback loop causing it to surge.

If you did drain the oil to the right level and the AOS is not an issue (I clueless here), you may have worn valve guides, rings…etc…not fun.

Regards, PK

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