POST 1 / ORIGINAL POSTEROriginal post
After engine warms up the idle begins to oscillate from normal to about 400 rpms about every 1to 2 seconds. Where would you begin looking?
3 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
Discussion summary
YOUR RESEARCHidle oscillation
1 matching discussions were examined; no attributable action/outcome evidence was detected. No consensus or repair conclusion is claimed.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Read captured repliesInsufficient extracted evidence does not mean there is no answer in the original discussions.
1 matching discussions · 3 captured posts examined · 0 partial discussions
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.
3 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
- Pelican Parts: 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: 20261026T220748Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
POST 2Original post
Could be the MAF sensor, or the AOS (Air Oil Separator). Some of the early warning signs of a failing AOS is hunting idle. On the Boxster, the symptoms seem to be more prevalent (engine smokes on start up, and hunting idle), but on the 996 the symptoms may not manifest in such an obvious way. Check engine light on?
POST 3Original post
What year? 1999 (and 2000?) non e-gas Have an idle control valve that can get gummed up and cause that.
This is a source reference. Confirm exact model applicability in the original material.