Okay so after driving about 20 something miles i arrive at school then put the car in 2nd gear 2 find a parking. After that i let the car roll, while pushing the clutch down in 2nd gear i hear this scratching sound coming from the engine it sounds like minature grinds, but it keeps repaeating. Well if anyone can tell me what it might be plz help and i am taking it to mazda 2 morrow morning should i take off my forge bpv?