Noise driving me crazy

[Solz]

Hey all,
I have a fiesta mk8 st with 1000 miles on the clock.
But I am having a real issue underneath the car. Whenever I drive over rough road I can hear a metalic rattle sound underneath. If I go over a big speed hump it’s fine, just seems to be at speed over rough road.
I have checked underneath and exhaust seems fine and I cant see anything loose. ?

many ideas would be welcome

 

[STleve1]

Check the heat shields, sometimes they rattle loose


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[Clint Beastwood]

Put it up on jacks and tap along the exhaust heat shields with a stick or something, when you get one that sounds "buzzy" Thats probably your culprit. You can usually bend 'em a little bit to stop them from touching whatever they are buzzing against.

 

[green_henry]

I upgraded the exhaust hangers shortly after purchasing my FiST and that cured some of the random noises I heard, particularly when the car was cold.