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Oil on Secondary Air Injection Check Valve?

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Old 03-20-2017, 02:38 PM   #1
msteiner805
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Default Oil on Secondary Air Injection Check Valve?

Hi Everyone,
In doing a transmission-out service, I happened to get a look at the Secondary Air Injection Check Valve and I'm not sure what to make of it - there's quite a bit of oil on it.

What could be causing this? I'm not too familiar with the vacuum system on the 996 just yet - but it looks like the source of the oil is coming from the throttle body???

Thanks,
Mike
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Old 03-20-2017, 02:45 PM   #2
Ahsai
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The is NOT the SAI check value, which is gray and has an electrical connector to it.
The valve is a one way valve that only lets vacuum into the vacuum tank (the black round canister on the right of your photo).

I agree with you that it looks like the oil is from the throttle body. Do you have oil accumulation at the bottle of the TB where it connects to the T-plenum? What's the crankcase vacuum level?
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Old 03-20-2017, 02:46 PM   #3
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http://rennlist.com/forums/996-forum...omponents.html

Your vacuum valve is relocated but functionally the same.
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Old 03-20-2017, 02:48 PM   #4
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If your AOS is going bad it causes a lot of oil to be in the intake system and various vacuum hoses/check valves will have oil just like that. It may be just the start. That check valve is on the vacuum system. How's your oil consumption? See this picture for vacuum line routing. You can see it takes vacuum from the intake manifold.
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Old 03-20-2017, 02:52 PM   #5
msteiner805
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Thanks Guys!
This was the part I found in the diagrams: http://www.pelicanparts.com/More_Inf...110-950-02-OEM

Do you have oil accumulation at the bottle of the TB where it connects to the T-plenum?
I will have to check this... not sure how.

What's the crankcase vacuum level?
I haven't put a meter to measure the vacuum yet, but, there is a strong change in engine note/idle when I remove the oil filler cap.

Mike
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Old 03-20-2017, 02:55 PM   #6
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Quote:
Originally Posted by DBJoe996 View Post
If your AOS is going bad it causes a lot of oil to be in the intake system and various vacuum hoses/check valves will have oil just like that. It may be just the start. That check valve is on the vacuum system. How's your oil consumption? See this picture for vacuum line routing. You can see it takes vacuum from the intake manifold.
Thank you!
Oil consumption seems high in the 250 miles or so since I purchased the car... I got it fairly cheap and in rough shape (shot transmission among other things). So I'm in the process of bringing it back to full maintenance.

Sounds like I should replace the AOS then... FYI - 105k miles on the car and I have no service history.

Here's my other thread: http://rennlist.com/forums/996-forum...-ring-diy.html

Mike
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Old 03-20-2017, 03:04 PM   #7
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For better deals on genuine parts, try Sunsetporscheparts.com

For better deals on OEM parts, try rndeuroparts.com and warehouse33auto.com (enter "RENNLIST" to get 10% discount)
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Old 03-21-2017, 05:48 PM   #8
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Hi Everyone,
I Just ordered a new AOS.
At the moment, I have the transmission out of the car (doing an IMS, RMS, clutch etc) and was wondering if I should try to replace the AOS from the rear of the engine? Is replacing it from the rear quicker than if I do it from the front?

Thanks,
Mike
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Old 03-21-2017, 11:22 PM   #9
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It took me less time to do it from the bottom only but it's still a pain in the a$$.
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