Assalamualaikum, so it is difficult to explain here in text.....
Actually a weird rattling type of sound comes from the engine when reverse gear is selected (this occurs just on engaging the gear and car is stands still, once the accelerator is pressed it is gone). Similarly when the car is stand still and revved and accelerator is free, then rattling sound comes and goes and it is normal. Can anyone plz explain what might be the reason. Car is mira 2015