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Getting high warm idle - 996.2 N/A

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

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YOUR RESEARCHGetting high warm idle - 996.2 N/A

Reported or suspected cause

so u might need a smoke test

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No successful repair reported for this finding.

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Identified cause: 1
Suspected cause: 0
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Discussions that suspect a cause: 1

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Suspected cause
Its the usual suspect so u might need a smoke test.
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Getting high warm idle - 996.2 N/A

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Leading evidence: 'so u might need a smoke test' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'so u might need a smoke test' (1 discussions; 0 report identifying it and 1 suggest it). 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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Reported and suspected causes (1)

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so u might need a smoke test

No successful repair reported for this finding.

0
Identified cause: 1
Suspected cause: 0
Reported fixes

Read evidence and context

Discussions that suspect a cause: 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.

Suspected cause
Its the usual suspect so u might need a smoke test.
Original post Read captured discussion
Getting high warm idle - 996.2 N/A

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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.

3 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

Rennlist: 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: 20261026T052503Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

My 2003 C4S has developed a fairly high idle that I'm trying to diagnose. Even when fully warm the car has started idling at around 1200 RPMs, when it was historically around 800 RPM or so. The idle is smooth, not lumpy or otherwise abnormal. I do need to replace the oil pressure sender as my pressure is almost always at 5 bar. Is that related? Any thoughts on diagnosing the high idle would be appreciated.

POST 2Original post

A vacuum leak? Its the usual suspect so u might need a smoke test.

POST 3 / ORIGINAL POSTEROriginal post

Damn. Vacuum leak is right!! (Insert here!) I popped the boot and found the culprit. The oil cap had worked its way off! Yeah, little bit of a vacuum leak. FWIW, the "OEM" oil cap from FCP Euro doesn't appear to be the correct part. I replaced my old one just for good measure not long ago, but I think I saved it in a box. I figured after 20 years it might be a good idea to replace it just in case the seal was old and cracked. The new one from FCP is visually different but seems loose. Weird.

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