I have Honda Civic 2007 model 97km odometer reading automatic. I bought it used 2 months back.
I realized an unusual sound from engine bay (mild hammering sound when in gears) when engine is warm (not in neutral) and only noticeable when it is in closed places like a parking garage.
The sound will not be noticiable if I start car in the morning and only noticeable after drive it for few kilometers.
My mechanic told me that it is from “begining bearing” and when engine is cold then due to high viscocity the sound will be not noticeable and when the car runs the viscocity of the oil will change (lighter) then the sound is noticeable.
I am attaching two mp3 sound files which I have recorde in my parking garage. When I Shift to gears the sound appears and when I shift to neutral the sound vanished off.
Pls bear with the sound quality.
Moreover, My mechanic said that I need to change the oil more frequently to not increase this sound. Otherwise, this is not impacting any other parts or engine. and this could be due to sudden throttle (i.e waiting on signal and suddenly raved the engine when it turns green).