12-26-2013, 10:44 AM
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#1
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Registered User
Join Date: Dec 2006
Location: shoreham, ny
Posts: 1,619
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Oil in my Airbox?
I have been working on my car a bunch lately. I noticed a decent amount of oil in my airbox and intake manifolds. I'm guessing you will all tell me that my AOS is going. Re assure me and tell me to replace it. Or am I missing something that would put oil in my intake system. The motor is a carrera 3.4 engine. 
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996 3.4 engine with 2.7 986 5speed transmission
Ebay Headers, Fabspeed high flow cats, JIC Cross, IPD Plenum, H&R Coilovers, B&M Short Shifter, AEM Uego Gauge Type Analog, Apexi S-AFC Select, 987 air box, Litronics, 2000 Tails and side markers, painted center console, 18" 987 S-Wheels, GT3 Front bumper with splitter.
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12-26-2013, 02:34 PM
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#2
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Registered User
Join Date: Dec 2006
Location: shoreham, ny
Posts: 1,619
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No one? Really?
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996 3.4 engine with 2.7 986 5speed transmission
Ebay Headers, Fabspeed high flow cats, JIC Cross, IPD Plenum, H&R Coilovers, B&M Short Shifter, AEM Uego Gauge Type Analog, Apexi S-AFC Select, 987 air box, Litronics, 2000 Tails and side markers, painted center console, 18" 987 S-Wheels, GT3 Front bumper with splitter.
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12-26-2013, 02:50 PM
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#3
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Registered User
Join Date: Oct 2010
Location: Nampa, ID.
Posts: 488
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I wish I knew something to say about this. You would think some of the techno guys would chime in with suggestions. Maybe it is just a delay due to the holidays. Give it time. Good Luck.
Bill.
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2000 Boxster S
And then there are the Motorcycles.
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12-26-2013, 03:54 PM
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#4
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Registered User
Join Date: Nov 2013
Location: Emerald City
Posts: 885
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I'd say. White smoke at startup? Anything going on with idle? If oil is in your intake or your airbox or on your maf, then its probably coming from your aos.
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12-26-2013, 08:00 PM
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#5
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Registered User
Join Date: Dec 2012
Location: Colorado
Posts: 159
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I can't think of anything else other than AOS.
Also, I'm interested on input whether it's worth/recommended installing the "Motorsports" aos version for cars that hit the track several times a year.
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2000 Boxster S
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12-27-2013, 02:54 PM
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#6
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Registered User
Join Date: Dec 2006
Location: shoreham, ny
Posts: 1,619
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I just ordered a new aos from pelican. I have no smoke but a new one can't hurt.
__________________
996 3.4 engine with 2.7 986 5speed transmission
Ebay Headers, Fabspeed high flow cats, JIC Cross, IPD Plenum, H&R Coilovers, B&M Short Shifter, AEM Uego Gauge Type Analog, Apexi S-AFC Select, 987 air box, Litronics, 2000 Tails and side markers, painted center console, 18" 987 S-Wheels, GT3 Front bumper with splitter.
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12-27-2013, 05:09 PM
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#7
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Registered User
Join Date: Aug 2013
Location: Bay Area
Posts: 700
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Did you get a new filter/oil your air filter recently? If its a NA engine (with only vacuum and full throttle being 0 in/hg), how would oil get into the air box form the AOS connection? Unless the carrera 3.4 AOS connects before the air box...
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12-27-2013, 06:17 PM
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#8
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Registered User
Join Date: Dec 2006
Location: shoreham, ny
Posts: 1,619
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Those were my thoughts also. I have no idea.
__________________
996 3.4 engine with 2.7 986 5speed transmission
Ebay Headers, Fabspeed high flow cats, JIC Cross, IPD Plenum, H&R Coilovers, B&M Short Shifter, AEM Uego Gauge Type Analog, Apexi S-AFC Select, 987 air box, Litronics, 2000 Tails and side markers, painted center console, 18" 987 S-Wheels, GT3 Front bumper with splitter.
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12-27-2013, 06:38 PM
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#9
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Beginner
Join Date: Mar 2013
Location: Houston
Posts: 1,659
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My intake was full of oil, so much so that oil was leaking out of the intake tubes, completely filling the depressions on the top of the engine, and spilling out onto the ground. Replying with any ideas or experiences on what this could be is appreciated. I'm also changing the AOS as a shot at stopping the oil.
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12-27-2013, 06:49 PM
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#10
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Registered User
Join Date: Oct 2011
Location: chi-town
Posts: 328
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Quote:
Originally Posted by JAAY
I just ordered a new aos from pelican. I have no smoke but a new one can't hurt.
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did you ordered aos for 2.5 or 3.4 ??
im in the same boat and thinking about this as well
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99' with 3.4l engine. ROW tune. SAI delete
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12-28-2013, 03:18 AM
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#11
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Registered User
Join Date: Dec 2006
Location: shoreham, ny
Posts: 1,619
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I ordered it for the 3.4.
__________________
996 3.4 engine with 2.7 986 5speed transmission
Ebay Headers, Fabspeed high flow cats, JIC Cross, IPD Plenum, H&R Coilovers, B&M Short Shifter, AEM Uego Gauge Type Analog, Apexi S-AFC Select, 987 air box, Litronics, 2000 Tails and side markers, painted center console, 18" 987 S-Wheels, GT3 Front bumper with splitter.
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12-28-2013, 09:53 PM
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#12
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Registered User
Join Date: Dec 2006
Location: shoreham, ny
Posts: 1,619
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I definatly think I need an aos. I pulled my oil cap today while the car was running and the idle fluctuated until I put the cap back on.
__________________
996 3.4 engine with 2.7 986 5speed transmission
Ebay Headers, Fabspeed high flow cats, JIC Cross, IPD Plenum, H&R Coilovers, B&M Short Shifter, AEM Uego Gauge Type Analog, Apexi S-AFC Select, 987 air box, Litronics, 2000 Tails and side markers, painted center console, 18" 987 S-Wheels, GT3 Front bumper with splitter.
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12-29-2013, 10:22 PM
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#13
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Registered User
Join Date: Aug 2013
Location: Bay Area
Posts: 700
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The idle SHOULD fluctuate with the cap off, as you are introducing a vacuum leak, bad AOS or not. The thing with the oil cap is if it is unreasonably hard to remove because of increased vacuum, caused by the bad AOS
Sent from my iPhone using Tapatalk
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12-30-2013, 04:22 AM
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#14
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Registered User
Join Date: Dec 2006
Location: shoreham, ny
Posts: 1,619
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Thanks epap. It was easy to take the cps off.
__________________
996 3.4 engine with 2.7 986 5speed transmission
Ebay Headers, Fabspeed high flow cats, JIC Cross, IPD Plenum, H&R Coilovers, B&M Short Shifter, AEM Uego Gauge Type Analog, Apexi S-AFC Select, 987 air box, Litronics, 2000 Tails and side markers, painted center console, 18" 987 S-Wheels, GT3 Front bumper with splitter.
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01-01-2014, 04:57 PM
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#15
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Registered User
Join Date: Aug 2004
Location: Alta Loma, CA
Posts: 1,334
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It seams (to me) all of the larger displacement engines have/end up with oil in the plenum.
FYI: there was no need to order the 3.4 AOS. Porsche just ran a water line to the 996 AOS to warm it up. Boxster has trouble getting heat out of the engine compartment.
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Engine Builds, Transmission Builds, Engine Conversions, Suspension Installs, Suspension Tuning, Driver Coaching, Data Acquisition, Video, SCCA/PCA/POC/NASA/GRAND AM/ALMS.
We have worked with amateur and professional drivers for over 26 years. In house machinist, In house fabrication. Our cars, our parts, our engines, our transmission's run nationwide at events every weekend. We work side by side with industry names developing parts.
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01-04-2014, 09:20 AM
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#16
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Texas-T
Join Date: Mar 2012
Location: charlotte, nc
Posts: 65
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I agree. It sounds like it could be the AOS. When my aos went bad I had oil in my intake manifold it also gave me 2 CEL codes though for lean air 02 sensors both banks. While in there I also found a small intake leak so I replaced my boots and replaced a missing screw that fell from the bottom of the resonace tubes butterfly valve. All has been good since. Pulled the intake last week to replace starter and there was hardly any oil in there at all. its been 8 months or so now since the aos replacement
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"This all started with a simple oil change..."
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