Rattle?

[kentiiboii]

Been driving car today and pulled up at a round about with a old xud behind me and heared a faint rattle so thought it was the xud. Went down my local bypass got to ikebana turned the car off and the rattle was back but louder. So I had a look round took engine cover off as I know it's loose but it wasn't that been checking nothing's loose. Cam
Belt and aux belt was done 10k ago as well all tensioners and things.

Just had it remapped to stage 1 but I doubt that would cause a rattle.

I started the car when I got it home and it was quiet again. So turn it off tried again and it was loud.

Any one had anything similar? Or any ideas. Going to strip aux belt tomorrow see if it still accurs. If still there stripping cam belt cover. Just don't want to remove cam belt as I'm skint this week :/.


Thanks ladies and gents