My friends got a 96 civic ex and its makin weird rattling noises... one of them i think is the heatshield rattling but there is another rattling noise thats kinda faint but you can still hear it and i cant tell what it is, there are no check engine codes or anything like that and also his tranny makes a weird noise just before shiftin kinda like a grindin noise but the gears dont grind... anyone know what could be wrong if anythin???