Tech help needed: Whooshing sound after engine off

[SERprise SVT]

Hey, guys--

I recently scanned for CEL codes when I had the plastic tubes in the intake manifold pop off and throw a 'Lean' CEL on me. I also had an 'Evap' code in there, as well.

I've begun to notice that, 2 seconds after turning the engine OFF, there is a whooshing sound coming from the passenger side of the engine bay. It lasts maybe 1-2 seconds, as if something is releasing pressure. The closest sound I can use to describe it is a turbocharged engine's blow-off valve.

Anybody know if the Evap CEL and this whooshing sound are related? Any fixes?

Help is greatly appreciated.

 

[SERprise SVT]

Anybody?

Maybe I'll just hit it with a hammer.

-GP-

 

[latemodelracer2]

If its the sound im thinking it is then its the a/c or some type of vacum realeasing. My truck does it everytime i cut it off. It will quit a lot quicker if when the truck is completly cut off you wait till the rpms are 0 then mash the pedal a little bit. youll here a loud woosh sound but the noise goes away quicker.

 

[RYAN the GREAT]

If its not the fan winding down, it's probably the A/C. It has a similar sound to that anyway.

 

[lightninmike]

Originally posted by SERprise SVT
Anybody?

Maybe I'll just hit it with a hammer.

-GP-

if that dont work use a BIGGER hammer

i still got lights too, starting to thik o2 sensors

 

[thepawn]

Originally posted by lightninmike
if that dont work use a BIGGER hammer

i still got lights too, starting to thik o2 sensors

The woosh is the vacuum release of the supercharger recirc when you turn the truck off.

Daniel

 

[SLVRLTNG]

it's a normal sound...nothing to worry about...JR

this won't fix it:bash:

 

[SERprise SVT]

Excellent info, guys. Thanks.

I just never really noticed the whooshing before.