Noise I hear when I shut my engine off.

Hello,Can someone tell me if the noise I hear when I shut my truck of is normal.It sounds like a pump is sucking liquid. It happens every time I shut the truck off and it last for 2 to 3 seconds.

 

AC unit maybe.

My work Chevy does that.

 

http://www.tacomaworld.com/forum/technical-chat/351337-new-owner-strange-whine-sound-when-turning-vehicle-off.html

 

what year is your truck? The newer ones do it i believe its some vacuum to clean the lines

 

Smog pump.

 

Yup, says emission equip in the owners manual. It's a great read

 

I have same noise on my 2015 OR. Kinda cool...makes it sound like it's winding down.

 

Its the hamster wheel spooling down

 

My truck is a 2013 access cab. Had it now for 2 weeks. Thanks for all the help and quick responses.

 

This... Also if you listen just about the time that your truck goes from high idle to normal idle, you'll hear a weird noise that sounds like a pully on a wobbly bearing. That too is normal.

 

Thanks, It does do that going to normal idle. Good to know that's normal .

 

Damn California!!! Screwing the rest of us.

 

I always make the joke its a blow off valve, or the turbo spooling down.

 

Or my weapons system powering down...

 

Weapons System!!!!!

 

AHA! So that's what it is. It has been bugging me too thanks.