ello bros.. plz help. i need some info.. The problem is there is a knocking sound after i hv done top overhaul on my 4AFE engine.. The sound was clearly heard when the engine is idling. The mech said it is valve sound and it is normal.. He said the sound will gone after a week. It is true? I think there is something wrong and it hv been 3 days and there is no sign the sound will be gone. :confused_smile: