18 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHSmoke
Leading reported evidence
Check "bad aos": while car is
Suggestion or failed attempt
No successful repair reported for this finding.
0
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0
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1
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Read evidence and context
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Suggestion
do a quick check for "bad AOS": while car is running, remove the oil filler cap, then replace after a few seconds.
Leading evidence: 'Check "bad aos": while car is' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check "bad aos": while car is' (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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Suggestion
do a quick check for "bad AOS": while car is running, remove the oil filler cap, then replace after a few seconds.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Suggestion · Original poster
No leaks, drips smooth running engine even at idle.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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Suggestion
do a quick check for "bad AOS": while car is running, remove the oil filler cap, then replace after a few seconds.
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.
18 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261027T000231Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
A few months ago during the summer during start up after sitting all night a puff of white smoke came out of the tailpipes, lasted about 2 seconds. Thick smoke I thought WTF. Never happened again until yesterday. I was coming off a clover leaf and clear ahead of traffic so I accelarated prob around 5k on the tach I got a big puff of smoke. I mean thick smoke. Came out of the throttle and pushed in the clutch and slowed and slowly released the clutch and a little more smoke not much then nothing again until start up this morning. It runs fine otherwise. All the gauges are normal. No leaks, drips smooth running engine even at idle. All mx up to date. 2002 911 with 63k on the odometer. Oil is right in the middle on the drip stick. I had a volkwagen vanigon do the same thing years back. Anybody have a clue?
+1
over fill or AOS sucked a tad
see it on the track fairly regularly - brief plumes of smoke - then nothing
We think the cars have Indian heritage that requires periodic smoke signals to the motherland
do a quick check for "bad AOS": while car is running, remove the oil filler cap, then replace after a few seconds. If cap is hard to remove + car's idle gets rough while cap is off = most likely bad AOS.
I had your symptoms, I was chasing.... I had put a brand new AOS, but it wasnt that. Chased it down to this... a crack in an O ring on the cam sensor... I believe it was pinched at the factory and finally gave way. Not likely its your prob, but just throwing it out here.
OK. Did the test descibed above and sure enough, cap hard to get off and rough idle. BTW havent seen any smoke since the last time 3 weeks ago or so. Now just for the record. What is the AOS?
The only thing I can find in the shop manual is the Air and oil separator? And since I have someone attention. What is an Indy shop? My applogies in advance but my automotive background is classic mustangs 20 years followed by 3 years of Toyota/Lexus 2JZ-GTE. I've owned my 02 996 for 6 months and still learning the lingo. Thats for the responses!!
You got the AOS right - Air Oil Separator. Indy = independent mechanic - not Porsche dealer.
Keep hanging out here and you will definitely learn a lot and welcome aboard to Porsche ownership!
WARNING: KK is a gearhead and knows his way around an engine
OP, take a gander at this HOW-TO to give you an idea if you can DIY it:
http://www.renntech.org/forums/index...placement-aos/
It seems like i may have the same issue. There is oil on the underside of some of the black throttle body air tubes and i had the big puffs of smoke yesterday.
It smoked for a little bit afterwards also.
I replaced the one on my boxster and i am sure this one will need it too.
I want to make sure that i am understanding this; there is only one aos in the car. For some reason i thought i saw something about two of them.
Mine went at around 60k. No smoke but leaked coolant (should call it an Air-Oil-Coolant Seperator). $1100 at my Indy. Seems to be a common failure at your mileage.
One's enough.
What you may be thinking of is the engine oil sump has two swirl pots designed to remove air from the oil as the oil comes from the scavenge pumps. These swirl pots de-foam the oil.
Oil in the air (routed to the intake) makes the engine smoke.
Air in the oil (routed to the bearings) smokes the engine.
Make sure to get the right one. Early cars had a bellows.
996-107-023-55-M100 Oil Separator, 996 Carrera 2/4 (1999-01), Each [More Info]
Brand: Genuine Porsche
Later (2002) did not
996-107-026-51-M100 Oil Separator, 996 Carrera 2/4 (2002-05), Each [More Info]
Brand: Genuine Porsche
Above from Pelican Parts Cat
http://www.pelicanparts.com/cgi-bin/...ILTER_TOOL2=10
So far so good. I think the smoke that i saw was attributed to me jacking up the right side of the car pretty high to get under it. I think the extreme angle may have leaked some oil where it shouldn't have.
But, i am pretty sure it will need to be replaced. If i don't see any more symptoms, i'll replace it next winter when it sits.
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