So it's about 40 degrees out here and I notice every time my car is 1-2 bar temp, I can hear a rattle type noise while revving the car up. I've read things about the tct but I only hear this noise while the rpms climb, getting more pronounced the higher the rpm.

Any ideas? I haven't noticed any other symptoms other than this noise and other than that, when the car hits 3 bars, it feels completely normal.

 

I take it that the noise goes away, when the car warms up to operating temp? Maybe valve-lash play, when engine is colder than usual?
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Yeah, it has gotten quite a bit colder lately. I'm guessing a valve adjustment would help this noise go away?