could be 1000's of things. impossible to guess over the internet unfortunately. if it makes this noise while its idleing / reving when not in gear then use a bit of tubing to listen to different parts of the engine bay to find where its coming from. that should narrow down the possibilities

surely sum1 no's.

Can any1 help me, last nite went out in car drove about 5 mile n then this wurring noise come from engine bay is sounded badi stopped the engine n checked oil n there were plenty in, satrted it agen and it was still there. i came back about 10 mins l8r and it was still mekin this noise so decided to go ome and on way ome i had drove about 3 mile n the noise just went and havent herd it since. also it made the noise stud still but it made it more noise wen got higher in rev range wen drivin, but it quietened down alot wen got in 4th n 5th gear. its a 1.2 16v corsa. does any1 no wat it cud be thanx scott