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YOUR RESEARCHsurging at idle - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Check oil level and noticed
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Performed · outcome unconfirmed · Original poster
I checked the oil level and noticed that it is a little above the full mark.
surging at idle - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'Check oil level and noticed' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check oil fill cap' (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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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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surging at idle - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace oil and filter
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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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surging at idle - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Check oil fill cap
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surging at idle - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Clean mass air flow sensor
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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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surging at idle - 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.
7 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
986Forum: 1 discussions
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Generation: 20261027T161234Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
97 boxster with 33K miles. I recently changed the oil and filter. A day or two after this job, I notice the engine surging at idle - dropping down to about 300RPM then jumping up to maybe 1100 RPM, but it idles normally about 50% of the time. Sometimes it surges, sometimes it doesn't.
Turning on the A/C bumps the idle up to about 700 RPM and I haven't noticed any surging with the A/C on.
I checked the oil level and noticed that it is a little above the full mark.
I don't know if this is coincidence with another problem or related to the oil change.
Doing some searching about the surging and the most cited answer is to clean the TB and replace the Air Oil Seperator (AOS). I just don't want to throw parts at it, so how can I tell if the AOS is defective?
I will, however, remove and clean the TB as it has never been done.
Insight? Suggestions? Much appreciated.
J
This reply wont be of much help.....but my new to me 01 box base with high mileage surges at idle when AC is on........and does not when AC is off. I will be interested in what is causing your issue.
When time permits, I'll clean the TB and will try to report back the results here.
If the TB on your vehicle hasn't been done in while, it probably would be a good idea to clean it. On my jeeps, cleaning the TB every 30k-40K miles was a well known std practice to guard against bad engine performance.
Am actually surprised that no one has provided any comments to the original post.
Well I have to replace my starter soon....so while I have the TB off it will get a good cleaning. Good luck with your scenario.....hope ya get it fixed.
Check your oil fill cap? Maybe its not on right, or its cross threaded.
Also to check your AOS -- you can undo the oil fill cap and see if there is a suction on the fill tube. If so, that's usually an indication of an AOS issue.
The other possibility is clean the MAF.
Mike
No suction on the oil fill cap when running is an indication that there is an air leak in oil fill tube. There should be suction, but not enough to prevent you from unscrewing the cap. If you cannot unscrew the cap when the car is running its an indication that the AOS is bad.
This is a source reference. Confirm exact model applicability in the original material.
