hey guys...

got a question here...i own a b310 a12 5 speeder. after a top overhaul, whenever my car has not enough power, eg. climbing a slope with 3rd gear,or in any circumstances whereby the speed below its recomended gear, it produces a metal like pinging/knocking sound. it seems to get more frequent as time goes by...anyone knows whats happening? sounds like smth is getting looser day by day...