Hello, i have a problem where sometimes upon starting the car (occurs on cold starts) there is a rather odd loud whirring noise coming from under the timing belt cover. The noise is very audible from both the inside and outside of the car. It lasts for around 2-3minutes regardless of immidiately taking off or letting it idle. The water pump, timing belt, belt tensioner and cam/crank seals were replaced around 2500km ago. Has anyone had similar experiences before?