Hi All, I found out what that nosie was in the engine bay other than the engine itself, it was the idle tensioner & the belts , I have now changed the belts but not the tensioner which is where the nosie still comes from the belts were Nissans own ( mileage 714240) . Any ideal where I can buy a new idle tensioner one with V ribbs on it from, I have checked the normal websites Ebay, carparts4less, eurocar parts, automaster.co.uk and others but they all have the idle tensioner without the V ribbs and if I were to use a smooth tensioner would it make any difference as its only a guide pulley? K11 1998 your Peter0003