"Plunk" sound abour 5 sec. after ignition off
 

I have only had my '08 SS for about two months now and I was wondering what the "plunk" sound is that I hear about 5 seconds after the car is turned off? Almost as if a hard plastic ball is falling into a metal cup. I am assuming something with the turbo/intercooler. Just curious.

Thanks

Dunno what it is but I have always heard it and haven't worried about it at all.

Plunk valve doing it's thing.

Define "Plunk" valve. "Moon" :D

They are on back order...just like the turn signal fluid.

Mine has done same thing since 12 miles. im sure its normal. almost sounds like a small metal ball falling onto a metal plate. Not sure but a good question to ask my service manager

I usually attribute that to the exhaust piping cooling off and shrinking, but that's just me.

Later
Allex

I thought it was just the muffler bearing seating after driving it. :)

The sound eminates from under the hood. I'm not sure but I believe there is a vacumn door that opens when the car starts and shuts when there is no more pressure to keep it open. either that or someone left a Guiness can with one of those balls in it under the hood.

I think it's the headlight doors closing.:lol: