I've just sorted my Powervalve issue out, and it's an new issue to the thread I think.
If you've ever had the governor apart, you will have spotted a little aluminium rings that slides up and down the main shaft. Mine had "picked up" and was intermittently sticking it got to the stage where it was hardly moving at all.
I put it down to bad maintenance, not changing the gearbox oil regular. Anyhow, I don't know if they are available for an 03 EC 300, but I polished the marks out and it works a treat now
