Anyone Know What This Sound Is?

[Abbas]

Hi all,

Does anyone know or heard of a clicking sort of sound or even a sound like little stones being thrown on metal. The sound occurs after a drive and can be heard when the car is switch off and parked up. It comes from under the bonnet.

I have heard this on a couple of cars and just wondered if anyone knows what it may be?

The only thing i can think of is it has something to do with the engine or exhaust cooling down...

Abbas

[WylieCoyote]

Yeah I've heard that before, I assumed the same.

[TigerFish]

It is the exhaust cooling, especially the cats.

[Abbas]

Do you think that's perfectly normal for the car to do it after every drive during hot and cold seasons?

[treborlex]

yes my is 250 does this its defo the exhaust & cat cooling down.

[DJ Wozza]

I think this is normal once the engine has reached a normal operating temperature.

I'd only be worried if it did the same thing after 30 seconds running from cold.

[Abbas]

Glad to hear its normal behaviour... Thanks for your input guys.