engine bay

Hi Mercedes club I need help. I bought my a class a140 few months ago 2004, mileage 50,000. Recently noticed when accelerating past 3rd (40mph) engine bay makes a very loud roaring sound. Only seems to happen when pressing accelerator, dies back down as car slows. Only way I can describe...

Hi team. It's my 1st post here so please, be cool with me cause each forums has its rules and I've perhaps missed someting (And I'm a frenchy and English language is not native for me). Well, I'm a W211 diesel owner E220 and today, I've cleaned my EGR valve cause the engine sometime is...