What exactly causes this Detonation, does my car not like 89 anymore ??? I put bosch platinum 1's in it about almost a year ago only cause i ws poor at the time, now i am haveing horrible detonation problems on regular, midgrade pretty much solves the problem but its kind of costly for what its worth. Second question, when im having this problem of detonation is it actually harming my motor at all mechanicaly ??? could my coil pack ( distributer i beleive) have anything to do with it ??/ wirea ??? anysuggestions or info would be gratly appriciated.