Buzzing Sound Right After Engine Shutdown

'14 Access Cab, Base, 2.7L, Auto, 5-Lug, 30K miles: Immediately after turning OFF the engine...I hear a 2-3 second "buzzing" sound coming from the engine compartment. I am sitting in the driver's seat with the doors closed when I hear it. Anyone know what this is?

 

Ok...I did a Google search on this and it appears that this noise is coming from the "Smog Pump"...and it is normal.

 

buzzing sound or kinda like a valve releasing pressure? mine sounds like a valve releasing pressure when shutting off and it is normal

 

It's the "Bat Turbo" Shutting Down

 

Unscrew your gas cap...and put it back on. Something about the emissions/pressure. It should stop buzzing.

 

Taco farts!

Don't worry it's completely normal.

 

Yes, it's normal, just as you turn it off. But it's different from the "pressure check" that happens, sometimes long after that truck has been shutdown. In fact, sometimes I'll step out to the garage and both my Taco and the wife's RAV4 are humming away.

 

Thanks for the info, I was wondering the same thing. By the way, plain Jane,... I can't stop staring at your avatar.... Dayum.