Is it possible that detonation and preignition noises would be apperent from the moment the car fires up or would this normally not only show once the car is warming up?
mines making rattles from cold to warm from top end im sure, also noticed that when idleing and slowly increase the revs to approx 3k it start gong burbley from the exhaust and then backfires when letting the throttle off again, seems to be rough!