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Planet-9

2009 Cayman S Rough Idle

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Original source
6 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCH2009 Cayman S Rough Idle

Leading reported evidence

Check make sure the oil cap is

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

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
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

Have the AOS checked, make sure the oil cap is on and tight.

Original post Read captured discussion
2009 Cayman S Rough Idle
Read full discussion summary

Leading evidence: 'Check make sure the oil cap is' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check make sure the oil cap 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.

Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.

Read captured replies

1 matching discussions · 6 captured posts examined · 1 partial discussions

Compare 4 other evidence results

Replace ignition coils

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

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
1
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

Did you replace the coils?

Original post Read captured discussion
2009 Cayman S Rough Idle

Performed · outcome unconfirmed

Coils were changed as well.

Original post Read captured discussion
2009 Cayman S Rough Idle

Replace spark plugs

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

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
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

The spark plugs have been replaced and the car has approximately 22k miles.

Original post Read captured discussion
2009 Cayman S Rough Idle

Clean mass air flow sensor

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

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 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

It could be a lot of things but you can try cleaning the MAF sensor.

Original post Read captured discussion
2009 Cayman S Rough Idle

Suggestion

I forgot to mention that I already tried cleaning the MAF sensor and that doesn't appear to be the cause of the problem.

Original post Read captured discussion
2009 Cayman S Rough Idle

Use cleaner made

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

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 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

Just make sure you use a cleaner made for it.

Original post Read captured discussion
2009 Cayman S Rough Idle
Frequently discussed actions (5)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Check make sure the oil cap is

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

Have the AOS checked, make sure the oil cap is on and tight.

Original post Read captured discussion
2009 Cayman S Rough Idle

Clean mass air flow sensor

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

It could be a lot of things but you can try cleaning the MAF sensor.

Original post Read captured discussion
2009 Cayman S Rough Idle

Suggestion

I forgot to mention that I already tried cleaning the MAF sensor and that doesn't appear to be the cause of the problem.

Original post Read captured discussion
2009 Cayman S Rough Idle

Replace ignition coils

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
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

Did you replace the coils?

Original post Read captured discussion
2009 Cayman S Rough Idle

Performed · outcome unconfirmed

Coils were changed as well.

Original post Read captured discussion
2009 Cayman S Rough Idle

Replace spark plugs

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

The spark plugs have been replaced and the car has approximately 22k miles.

Original post Read captured discussion
2009 Cayman S Rough Idle

Use cleaner made

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

Just make sure you use a cleaner made for it.

Original post Read captured discussion
2009 Cayman S Rough Idle
Coverage and how to read this overview

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.

6 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: 20261027T075545Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1Original post

Hello, the idle of my Cayman S seems to fluctuate (when fully warmed up) - it fluctuates up and down by ~100-200 RPM and can feel a bit rough a times. I thought this was only at idle, but today I noticed that the RPMs slightly fluctuate when driving at a constant engine speed as well (you can see the RPMs moving slightly at speed). The spark plugs have been replaced and the car has approximately 22k miles. Any thoughts regarding what could be causing this? Thanks for your help.

POST 2Original post

It could be a lot of things but you can try cleaning the MAF sensor. Just make sure you use a cleaner made for it. carb and choke cleaner may damage it.

POST 3Original post

I forgot to mention that I already tried cleaning the MAF sensor and that doesn't appear to be the cause of the problem.

POST 5Original post

My guess is some sort of vacuum leak. Have the AOS checked, make sure the oil cap is on and tight.

POST 6Original post

Coils were changed as well. Do the 2009s (987.2) have air oil separators, and if so, are they prone to problems? Oil cap is on tight. Thanks for your help.

This is a source reference. Confirm exact model applicability in the original material.