14 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHHow To Change Idle Speed?
Leading reported evidence
Adjust idle manually
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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Discussions that contain suggestions
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Leading evidence: 'Adjust idle manually' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is '"low idle, what's the problem"' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Adjust idle manually' (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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Suggestion · Original poster
So does that mean i cannot adjust my idle speed manually?
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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Suspected cause
why do you want to change the idle.....maybe the real issue is - "low idle, what's the problem"
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Suggestion · Original poster
Does anyone have instructions on how to change the idling speed on a 2000 porsche C4?
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Suggestion
Two basic RPM settings are preset by the factory to keep the car running at idle with the A/C running (slightly higher RPM) and without the A/C running.
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Suggestion
Two basic RPM settings are preset by the factory to keep the car running at idle with the A/C running (slightly higher RPM) and without the A/C running.
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.
14 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
If you have idle problems then you likely have a dirty throttle body or an intake air leak.
Why do you feel you need to adjust it?
BTW... the DME should keep it constant 700 RPM + or - 40 RPM (no AC).
100plus,
Your first post comes on a Sunday morning at sunrise here in the Eastern USA. The Western USA folks won't be up for hours. And it is Sunday morning... patience. I'm guessing 90% of Rennlisters are in the USA, and your best technical responders won't be looking in here until much later today.
However, that being said, Loren has given you the best possible response.
That is correct. You cannot adjust your idle manually. It is all done by the programming in the ECU. Two basic RPM settings are preset by the factory to keep the car running at idle with the A/C running (slightly higher RPM) and without the A/C running. The actual fuel flow depends on the dozens of factors monitored (ambient air temp, engine temp, barometric pressure, humidity, fuel quality, etc etc) The RPMS are selected not only to keep the engine running at idle with the two basic loads (A/C, no A/C) but to meet emission requirements for idle speeds.
You still haven't explained why you would want to do so.
If you have a manual transmission and have modified the flywheel to a lighter item, you probably need to have your ECU flashed with a program designed for that.
Keep in mind that the 1999 Carrera 2 was the last 996 to have an actual cable running from the gas pedal to the engine. Everything else is fly-by-wire after that.
No particular reason. Just felt like pushing up the Rpms to 900. Nicer idle sound? Haha. Anyway thanks for the info! Now I know I cannot manually adjust it ...
On the cable drive, the idle speed is controlled by the idle air control valve, engine timing, and engine computer. Not the throttle plate.
The way to change this is to hack the DME. I wouldn't.
