16 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHOil leaking from bottom of air filter housing
Leading reported evidence
Check pipework
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Performed · outcome unconfirmed
I checked the pipework which didn't appear to be too bad, certainly not as bad as some I've seen, but oil was present.
Leading evidence: 'Check pipework' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check big hose' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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1
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Performed · outcome unconfirmed
I had my MAF cleaned and they are fragile inside, just be careful....
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Performed · outcome unconfirmed
Mine has almost 0 oil in the air cleaner and I use motor compression braking a lot.
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Discussions that contain suggestions
1
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Suggestion
Check the big hose that goes to the MAF and clean the oil out of that large hose.
Clean mass air flow meter unless you discover the exact
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
Do not try to remove oil from the mass air flow meter as its too sensitive, even to fluids that are specific to cleaning the mass air flow meter unless you discover the exact
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
16 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Planet-9: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T181445Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi all. Just bought a
987.2
2.9. I've noticed oil leaking from the underside of the air filter housing. Its dripping onto the oil filter which looks black and sticky. Air/oil separator?
TIA. Ciaran.
Claran - welcome to Planet-9, the friendly
Porsche
Forum..
Most likely, but clearing it off and dust with baby powder to see the trail of the oil.
BTW - please visit
New Member Introductions
and introduce yourself and your car. Photos are good.
I'm also going to move your thread into a specific forum for problems.. posting it in the general "chat" area isn't all that great for tech questions.
Thank you. New here, so, not sure of the rules. Thanks for the tip. Never thought about using baby powder. I intend to change oil and filter and clean the entire area this weekend. I'll give it a dusting then.
CiaranD, do you get smoke on startup? With all the oil in your air box, which could only get there by the back flow on deceleration. You wonder about the mass air flow meter which is between the throttle body and the air filter, which is probably coated with oil. Just thinking about where the rest of that oil is going under acceleration. Maybe on the back sides of the intake valves. Please confirm that the AOS is bad by having a vacuum negative pressure gauge done from the oil fill port.
I only got the car on Sunday. Took it a quick run then parked it in the garage. Started it today for the first time and it smoked for 5- 10 minutes. Bear in mind, it's cold here atm, only around 4°Celsius. The smoke wasn't oily smoke and it didn't smell bad in any way so, I'm assuming it was just the cold weather. I'll get tinkering this weekend and post back findings.
Open the air box and replace the filter. Check the big hose that goes to the MAF and clean the oil out of that large hose. Do not try to remove oil from the mass air flow meter as its too sensitive, even to fluids that are specific to cleaning the mass air flow meter unless you discover the exact
Porsche
one. Once it sends a warning message to the ecu you will need to change the MAF out.
Check out the licence plate area for oil droplets. If you find any that may mean the catalytic converters are coated with oil as well. That oil will eventually burn off the converters if you change the AOS.
Don’t fill the oil to the full line, keep it one bar below. If you do that and clean out the intake per above I bet it will fix the issue. Even with a good AOS I was getting oil in the intake until I just filled it a tad lower.
I’ve hosed down my MAF with MAF cleaner a couple times without issue, and that’s the first I’ve heard of it being sensitive to that. But YMMV.
Quick question... do you know if your car has been desnorkled..? Can make a difference to how much moisture enters the air filter housing in my opinion. I had my MAF cleaned and they are fragile inside, just be careful.... it does make a difference to how the car runs too.
CiaranD- Any progress with the oil in the filter box? You got an interesting situation as your engine is port injected, which means that the AOS is more like the M 97 models, I believe. At any rate its most likely failed. A manometer can let you know how much vacuum it is producing. Don, you are the expert on these motors, what vacuum level should he see using the vacuum gauge? I would think,
Porsche
put the 9A1 3.4 motor AOS on your 2.9 engine. Don what's the final word here?
Apex. I changed the oil & filters. This was the state of the air filter. I checked the pipework which didn't appear to be too bad, certainly not as bad as some I've seen, but oil was present. Does this look normal to you?
(Looks like a nifty little tool in above screen shots)
Unfotunately, I don't have a vacuum manometer so I can't say. I haven't looked to see if the 2.9 and 3.4 share the same AOS, but the replacement instructions are the same... so they probably did. Unfortunately the 2.9L AOS won't fit earlier engines, they made it much easier to swap out (meaning it probably won't need swapping out) and changed how it connects to the engine over the earlier engines.
