I have a 1.4 S reg Corsa with an X14XE engine. The problem I have is that there is something making an appaling rattling sound under the bonnet. It is definitely engine speed related. I have removed the auxiliary belt and started it up and it was still there. I took the cam belt cover off and found the belt was rather worn so I have changed that along with the two idlers and the tensioner. AND IT STILL RATTLES. It sounds like it is coming from the alternator area. Has anyone else experienced this? I need your help!!!