986Forum

Irregular idle when A/C is on - feels underpowered - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Add to repair workspace

6 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHIrregular idle when A/C is on - feels underpowered - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Leading reported evidence

Disconnect vacuum hoses and possibly causing more issues

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
Instead of removing your throttle body to look for disconnected vacuum hoses and possibly causing more issues.
Original post Read captured discussion
Irregular idle when A/C is on - feels underpowered - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Frequently discussed work

Check next

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 · Original poster
I have no idea what to do/check next
Original post Read captured discussion
Irregular idle when A/C is on - feels underpowered - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Read full discussion summary

Leading evidence: 'Disconnect vacuum hoses and possibly causing more issues' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check next' (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 · 0 partial discussions

Compare 3 other evidence results

Check next

Suggestion or failed attempt

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 · Original poster
I have no idea what to do/check next
Original post Read captured discussion
Irregular idle when A/C is on - feels underpowered - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Disconnect vacuum line cause the above symptoms

Suggestion or failed attempt

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 · Original poster
Would a disconnected vacuum line cause the above symptoms?
Original post Read captured discussion
Irregular idle when A/C is on - feels underpowered - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Run sometimes

Suggestion or failed attempt

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 · Original poster
It feels underpowered and it seems like its struggling to run sometimes.
Original post Read captured discussion
Irregular idle when A/C is on - feels underpowered - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Frequently discussed actions (4)

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

Check next

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 · Original poster
I have no idea what to do/check next
Original post Read captured discussion
Irregular idle when A/C is on - feels underpowered - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Disconnect vacuum hoses and possibly causing more issues

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
Instead of removing your throttle body to look for disconnected vacuum hoses and possibly causing more issues.
Original post Read captured discussion
Irregular idle when A/C is on - feels underpowered - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Disconnect vacuum line cause the above symptoms

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 · Original poster
Would a disconnected vacuum line cause the above symptoms?
Original post Read captured discussion
Irregular idle when A/C is on - feels underpowered - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Run sometimes

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 · Original poster
It feels underpowered and it seems like its struggling to run sometimes.
Original post Read captured discussion
Irregular idle when A/C is on - feels underpowered - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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.

986Forum: 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: 20261026T105141Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Hello to this great forum (again) So, for the last 6-7 months im havin a weird issue with the power of the car. It feels underpowered and it seems like its struggling to run sometimes. It seems that when some stuff get activated (like radiators, AC on ) the car is struggling to keep the PRMs up properly. I have changed Oil, filter, O2 sensors, Spark Plugs and Coils, Air filter, MAF sensor like 1 week ago and i hoped it would solve the issue but its still there. I have no idea what to do/check next When the radiator or the AC gets on, the RPMs go "abnormally up" from 800 RPM to 1300 and then it falls below 800rpm and sometimes close to stall (car shaking)... Any ideas? No CEL yet. Any advice is highly appreciated :dance:

POST 2Original post

Look toward your electrical side...a bad voltage regulator (on back of alternator) will cause all sorts of weird behavior.

POST 3 / ORIGINAL POSTEROriginal post

Hmmm but it doesn’t seem to be the case since most of the symptoms don’t apply here I think I may have to remove the throttle body and look for vacuum lines that are disconnected. Would a disconnected vacuum line cause the above symptoms?

POST 4Original post

Yes................

POST 5Original post

Instead of removing your throttle body to look for disconnected vacuum hoses and possibly causing more issues. Just do a simple vacuum test. It will tell you if you have a vacuum leak or not.

POST 6 / ORIGINAL POSTEROriginal post

Ok here are some updates: I removed the oil cap and the car sounded like its running rough (struggling shaking etc) BUT the RPMs stayed at the same level. What does this mean ? The car was not fully warmed up tho - not sure if it matters.

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