EC300 suddenly low on power but then returns back to normal

[Mika]

Hi,

I have a EC300 2008. With some strange enginge behavior. A couple of times i have experience suddenly power loss and a change in engine sound. First I thought i lost the silencer or the exhaus gasket. But they semes to be fine.

Then i notice that it can go back to normal if I do a couple of more runs. You can listen to the sound i the clips on you tube.

The first is very loud with bad power output. https://youtu.be/82lFPtz-hPY

The other is normal power. https://youtu.be/NRMCXnJ5rKQ

Between these clips i only did a 100m run.

What do you think can cause this?

Regards Mika