So I have heard this noise coming from the engine bay when I'm shutting down the car that sound like two light pieces of metal are slapping against each other. I used a stethoscope and found that the noise was coming from the supercharger nose cone. I don't think that its the SC coupler because all that I have read is that the coupler fails and at idle you can hear marbles bouncing around. Mine is not like that. Any insight will be helpful. Oh and the pulley stops turning and it's as if stop after winding down.

Any thoughts?

 

You sure it's not the TB closing sequence? It makes a metallic click sound after the motor stops and it snaps back to neutral position.

 

I'm having a wierd sound on my engine bay also..Mine if you upload a vid?

 

Pretty sure Joe nailed it, I've heard that noise since I bought my car. It sounds like a very tinny clinking noise about 1 second after the key is turned off. It's normal

 

So it's the damn throttle body. I sounds like it's rotational though like a clinking noise . I will have to check it out tomorrow. I did not know that the TB went through a shut down sequence. weird. I can't upload the video of it sorry

 

Yeah, the TB normally is in a fully closed position at idle, at least just about closed. Once the motor stops turning, the TB releases to it's middle position and it makes a loud metallicy click noise.

 

Interesting I will check it out