New owner. Turn off engine whirl sound

New owner here. When I turn off the engine for about one or two seconds I get a whirling sound in the engine that Reba/whistles hi and then turns off. The sound is similar to that of what a turbo engine makes when it engages.

Is this the fan turning off? Or something in the engine?

 

I think this happens like 4-8 hours after shut down. Noise comes from near the gas tank.

 

in the engine area when the engine is turned off most times it is the air injection pump

 

Mine does it too. It’s normal.

 

This, in the engine bay the secondary air pump makes a whooshing noise.

 

thank you. Never had a car sound like it was something reving up before shutting down when engine was turning off. Sounds kind of cool as if its releasing pressure after that exhausting drive

 

Mine does it too, must be the flux capacitor shutting down.

 

https://trail4runner.com/2018/12/18/4runner-air-pump-mod/

Wait until you do this mod and it's so loud peoples heads start turning. I will probably buy a new filter yearly but the pump is very happy after doing this and I hope to never have an issue.

 

No seriously stupid question but do they really have one? I'll need to look tonight.

 

The engine was probably thinking about being replaced by the 3.5L.........PSH

https://www.youtube.com/playlist?list=RDkhfiJ9q6IqI

 

Mine does it also.

 

Is this mod worth the hassle? Thanks folks

 

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