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YOUR RESEARCHReplaced AOS, but car is idling rough - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Leading reported evidence
Replace air oil separator
Performed · outcome unconfirmed
No successful repair reported for this finding.
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0
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Performed · outcome unconfirmed · Original poster
I therefore thought the AOS was failing (in part it may have been) I replaced the AOS after following the excellent guide as linked on from this forum - However the squeaking noise is still just about audible (much much fainter than before) The car is also idling very roughly anytime you come off the throttle.
Replaced AOS, but car is idling rough - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'Replace air oil separator' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace air oil separator' (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.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
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.
Discussions that performed work without a confirmed outcome
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Performed · outcome unconfirmed · Original poster
I replaced the spring type clamp with a jubilee (screw) type clamp.
Replaced AOS, but car is idling rough - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace aos, i would look
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Suggestion
Also, if it ran good and you replaced the AOS, I would look for a vacuum leak and yes, you should have replaced the J-tube.
Replaced AOS, but car is idling rough - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace j-tube
Suggestion or failed attempt
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Suggestion
Also, if it ran good and you replaced the AOS, I would look for a vacuum leak and yes, you should have replaced the J-tube.
Replaced AOS, but car is idling rough - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace plastic y tube
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Suggestion · Original poster
Would it be worth replacing the plastic Y tube that connects the AOS to the throttle body?
Replaced AOS, but car is idling rough - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Frequently discussed actions (6)
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Replace air oil separator
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
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.
Performed · outcome unconfirmed · Original poster
I therefore thought the AOS was failing (in part it may have been) I replaced the AOS after following the excellent guide as linked on from this forum - However the squeaking noise is still just about audible (much much fainter than before) The car is also idling very roughly anytime you come off the throttle.
Replaced AOS, but car is idling rough - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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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.
5 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
986Forum: 1 discussions
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Generation: 20261027T011819Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hello Everyone!
My car was making the belt squeaky sound very loudly, removing the oil filler cap elimited the noise. I therefore thought the AOS was failing (in part it may have been) I replaced the AOS after following the excellent guide as linked on from this forum - However the squeaking noise is still just about audible (much much fainter than before) The car is also idling very roughly anytime you come off the throttle. It tends to sort itself out after 5 seconds or so but I can tell something isn't quite right - feels slightly more brash and lumpy, rather than the silky smooth feeling it had before. It also caused the check engine light to come on - I've since reset the battery as I took the AOS out and re connected it all fearing I had not connected something correctly. I'm 100% sure everything is now connected properly. I was given a new rubber hose bit with the AOS (is this the bellows??) that connects right at the bottom of the AOS. I replaced the spring type clamp with a jubilee (screw) type clamp.
Any ideas as to where the problem maybe? Would it be worth replacing the plastic Y tube that connects the AOS to the throttle body? At a guess I'm assuming there is a vaccum leak somewhere as when I take the oil filler cap off the car idles much more smoothly.
Thanks
Mike
Unfortunatly I don't have a diagnostic reader to read the fault codes. However, I'm pretty sure if I let the car run for 20 mins or so the CEL light will come back on. Am I best of taking it to a mechanic?
The AOS has different symptoms will it begins to fail. Mine made a loud squealing sound after it warmed up and only then. A Porsche mechanic told me the AOS was bad and the squeal was the result of air being sucked around the front crank seal. If yours was squeaking on start up, I would bet you have a different problem. Also, if it ran good and you replaced the AOS, I would look for a vacuum leak and yes, you should have replaced the J-tube. Last question...did you have smoke coming out of the tail pipe.
Thanks for the replies guys.
I took the car to a mechanic today and he kindly plugged his diag. computer in...... although the light is not on, a fault is coming up as the o2 sensor.
I've spent a good hour checking all the connections, unplugging and replugging tubes back in and they are all def. in ok.
I didn't replace the J tube as my car has a slightly newer setup with the "Y" peice. however there is a rubbber hose that feeds off of this to the air intake somewhere, while the other peice of the Y has a flexible plastic bit that goes to the AOS.
I didn't notice loads of smoke, but the squeaking was very prominent beefore.... Now that I've replaced the AOS, the car emitts a very slight squeaking (sounds liek a belt still) but only once it is warm.
I guess I'll have to change the o2 sensor - does it sound as if it would be the likely cause? I can't help but think that the squeaking noise is connected to the AOS/vacuum leak somewhere?
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