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Discussion summary
YOUR RESEARCHRPMs increase without additional throttle when in neutral
Leading reported evidence
Run smooth and steady at ~800 rpm
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Suggestion · Original poster
When idling in neutral and the clutch out, the engine seems to run smooth and steady at ~800 RPM.
RPMs increase without additional throttle when in neutral
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Leading evidence: 'Run smooth and steady at ~800 rpm' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Run smooth and steady at ~800 rpm' (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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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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RPMs increase without additional throttle when in neutral
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Recalibrating the egas (aka throttle body adaptation) fixed it!
Hi team! This morning I noticed what I think is new and unexpected behavior in my 2003 996 C2. When idling in neutral and the clutch out, the engine seems to run smooth and steady at ~800 RPM. If I depress the throttle just a tiny amount, perhaps 1 cm, the RPMs increase a bit as you would expect - but then they continue to increase without interruption up to 2300 RPM, without any additional throttle input. That is to say, I'm still holding the pedal still at 1 cm depressed, but the RPMs just keep climbing up to 2300. If I back off the throttle, the RPMs immediately fall back to 800. However, if instead I continue depressing the throttle past the initial ~1cm, nothing happens - the RPMs stick right at 2300 - for some measurable amount of pedal depression before eventually continuing to climb. It's like it's stepping up and down in "all or nothing" fashion... the RPMs want to go to 2300 regardless of pedal position up to some point (which I did not measure but let's say it's 3 cm depressed just for argument's sake), and then if I slowly back off the throttle from wherever it happens to be, there's a sudden drop back to 800 instead of a gradual decline.
IF, however,
I do all that with the clutch depressed,
the RPMs increase/decrease exactly in relationship with pedal position, as you would expect. I can control the RPMs with fine granularity anywhere on the scale, including between 800-2300 RPM, and any change in pedal position results in an appropriate change in RPMs.
It's hard to tell but I think the "stepping" behavior is also happening when in gear and in motion, at least in 1st and 2nd. It's hard to get smooth transition in RPMs when changing gears, and just driving around in 1st feels more clunky than usual.
Any ideas of what might be going on?
Thanks!
That sounds like what my engine was doing, though the clutch position is not something I noticed. Turned out my throttle body was faulty, required some new parts, inc throttle body, and an hour or two labor by my Indy. It was about 750 all told. Good luck!
Before you do anything else, do an e-gas calibration. From off, turn the key to ON (not start) and wait 60 seconds. Then off again. You should hear some whirring and clicking from the engine bay while the throttle body calibrates itself.
