Well hello... I have a 93 sedan civic with a b16a2 swap on it low mileage... So my problem is that i hear a weird sound like light metals trembling... Or like unscrewed screws trembling ... Problem comes at 1200 rmp and then at 2.300 rpm
​​​​​​And if stay at that rpm range i hear it non stop.. Its not really loud but my ocd kicks in.. And i am really worried about the health of the engine... Any help please? Excuse my for my English.. Thx in advance

 

Could be a number of different things. Does it only do it at speed, or can you make the car rattle when free revving it in neutral? Try to pinpoint the location of the sound. It could just be one of the heat shields on the exhaust under the car is loose.