M120 Revs high on start up, sometimes above 3500 RPM

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M120 Revs high on start up, sometimes above 3500 RPM

11-08-2021, 07:52 PM

Roncallo

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Join Date: Oct 2004

Location: CT

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M120 Revs high on start up, sometimes above 3500 RPM

For some reason I have a situation that is getting worse and worse. When I start the engine the RPM flairs up sometimes over 3500RPM. The video shows to flaring toe 2500, but about 20% of the time it will go to 3500RPM. Not a good way to start a cold engine. I'm thinking possibly gummed up throttle shaft reacting slowly. Can anyone recommend a throttle shaft lube that wont interfere with any of the sensors. Any other ideas as to what could cause this?

This engine is from a 1996 SL600. My 1999 SL600 stays below 1000 RPM.

https://youtu.be/2w2s5DV1z2E

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