Herbert Lego

Hello everybody,
following problem with my AVEO T255, 63,000km mileage, 1.4, 101HP from 2009.

The engine speed is out of round for a few moments after the cold start. The speed increases to just over 1000rpm - but only for a few seconds. After that, the engine remains calm at 900rpm. Is this normal for the engine?
New in February:
- Lambda sensor
- spark plugs (without ignition cable)

Thanks in advance and greetings from Germany.

tech2

is the rubber hose from the air filter to the throttle body torn. they tear on the bottom from repeated flexing when the air filter is checked. this would create a lean condition at idle which you can see in the fuel trim data. the bigger concern is unfiltered air entering the engine.

Herbert Lego

Hi, thanks for the answer! I'll check the rubber hose from the air filter tomorrow. It is strange - yesterday the car was very restless after the cold start, i.e. significant speed fluctuations at approx 21 degrees outside temperature. I just had a cold start again, and the speed is a bit higher, but remains stable for now.
I also made a video. Do you hear the sound at 4sec?