Is my AOS going?

[eightsandaces]

With my car being white is was easy to watch the AOS go, near the end the rear cover would get a ever so slight coating of oil, not anymore since a/o replacement.

[S3adrag0n]

944boy, that definitly help. I've heard you should not get any air sucking at all to ok to have air sucking. With your AOS replaced and is doing what mine is doing, I feel a lot better so I'll go and stump on my gas peddle today! Here's to you...

[blue2000s]

In order to reduce oil contamination, foaming and moisture build-up and minimize pressure build-up, the car's crank case is under a slight vacuum by a connection with with intake manifold. The AOS sits in the middle of this connection to collect most of the oil that is pulled from the crank case and returns it to the engine. It is completely normal to hear or feel a vacuum when opening the oil cap.

[S3adrag0n]

Thanks blue2000s, that's a great explainaton! Here's to you too..

PS. I was out there in CO (Lafayette visiting my in-laws) a couple years ago and man, did I feel bad visiting them a week earlier and missed the Porsche Parade.

[Oaktown 986]

reviving this one.. i'm testing my MAF and some other items on my car currently, and while it was idling, I pulled the Oil filler cap off. The car's idle dropped when I did that, and it wasn't very difficult. My question is; is my AOS failing if the idle drops or is that normal?

[yimmy149]

Did you even read this thread? Your answer is right here:

Originally Posted by blue2000s

In order to reduce oil contamination, foaming and moisture build-up and minimize pressure build-up, the car's crank case is under a slight vacuum by a connection with with intake manifold. The AOS sits in the middle of this connection to collect most of the oil that is pulled from the crank case and returns it to the engine. It is completely normal to hear or feel a vacuum when opening the oil cap.