Hi folks, On a couple/few occasions, my 2012 Prius II has started rapping at start up. The motor will turn on but as soon as the gas motor kicks on there is a pronounced rapping noise emanating from it. It only lasts for a couple of seconds and then stops. It did it once after having sat for about a week but now it did it after sitting for about a day and a half. Any thoughts/experience on this one?
