POST 1 / ORIGINAL POSTEROriginal post
When I first start my 1999 996 from cold it immediately revs up high for a split second than back to normal. Thoughts, or normal?
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YOUR RESEARCHStarting High revs
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When I first start my 1999 996 from cold it immediately revs up high for a split second than back to normal.
No unique explicit quoted action; no causal link assigned
Generation: 20261026T061123Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
POST 2Original post
Normal, on cable throttle bodied M96. The ICV is fully open during cranking and once the engine fires and revs are over a certain threshold indicating engine is running, it is closed to a smaller opening and controlled by the ECU to keep revs at idle rpm (850? +/-50). No experience with eGas M96 but presumably the throttle plate is controlled similarly to the ICV. All in all it would have been possible to calibrate the ECU to not have such an overshoot as BMWs with the same Bosch DME 5.2 or 7.8 of the era don't exhibit this behaviour, so I guess it was done on purpose by Porsche to make starting the car a bit of an event because 'sports car'.
POST 3 / ORIGINAL POSTEROriginal post
Quotes source post: 20627264
Thank you for your response.
POST 4Original post
The high revs are also to help ensure the oil pump is primed. Most engines with the oil pump above the oil level do this.
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