Repost from Driver. Issue is currently unresolved.

So, WTF is that noise right after shutdown, then 30sec later at the end?

Aside from needing an exorcist, I'm guessing some kind of freakish back current through the throttle body.

http://www.youtube.com/watch?v=5uo4J...layer_embedded

 

i just got the same feeling I had while watching the Exorcist for the first time. Sorry to not be any help.

 

WTF?

 

LMAO!

I have no suggestions - specially since its AFTER the car is off for 20-30 seconds..

 

Vacuum canister for power brakes bleeding down because of leaking check valve? See if the brake pedal is unusually hard when the engine is off after the noise happens. That would verify the lack of vacuum in the canister. It should store enough for a couple applications of the brake for quite a while after the engine is off.

 

LMFAO what the hell! I think you do need an exorcism, there's gonna be some dead being stuck in your plenum or something of that nature. Sorry to be no help, but damn I wasn't expecting that!!! Haha

 

Have you checked the air pressure in your tires???

 

lol

 

I'm dying over here lool

 

i iz scurred now

 

Maybe it's something to do with the air conditioning. Does having the AC (and defrost) off make any difference?

 

lmao wtf ahahahah dude sell that thing asap...

 

DUDE. YOU NEED TO SELL THAT WITHIN 7 DAYS! I'm pretty sure I've seen a movie about this sh*t.

 

Hey, OP.

I've given you two semi-reasonable possibilities with easy tests to see if they're the cause. How about some feedback?

 

It's not my car. I just reposted it from driver. I did forward the ideas to him, here are the results, at least based on the testing ideas:

It's not the brake system.

Not the A/C either.

My suggestion, to rule out the TB, is to remove the air filter and cover the pipe after shutting it down to see if that mutes the sound. I still think it's coming from the TB...electrically induced noises from the throttle plate perhaps. The throttle body stays energized for around 30 seconds after shutdown (and the entire ECU). Listen carefully, you can hear some pops/clicks that do not sound pneumatic just after shutdown, and again before the 'screech'.

 

LOL, time for an exorcism!

 

she's crying for boost!

 

those first couple clickes are the TB i wouldnt say "reseting" istelf but it opens and closes a couple times after it shuts down.

and the other noise means your ****ed.

 

Thats one of the craziest things ive ever seen.

 

I have seen Cooling system do this, Replicate the noise and pay attention to the cooling system hoses and rad cap, you will see that 's where it is coming from .

Good luck

Sam