Hissing noise underneath the rear bumper

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2008Vibe
Posts: 3
Joined: Sun Aug 09, 2015 9:07 am

Hissing noise underneath the rear bumper

Post by 2008Vibe »

Is this normal? I always hear this hissing noise underneath the rear of my bumper somewhere by the muffler while the car is parked, engine off.

This usually happens approximately 5 hours after I have parked in the garage where it is quiet.

The hissing sound lasts about a minute then shuts off.

Is there something electrical there by the muffler? Some kind of gas evaporator or something? I went underneath and can't pin point where the sound is coming from.

Ok, the sound is more like a small air compressor motor sound than hissing but not as loud.
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Chiadog
Posts: 971
Joined: Thu Aug 09, 2012 9:41 am
Location: Abrams, wisconsin

Re: Hissing noise underneath the rear bumper

Post by Chiadog »

I think your car is infested with a nest of Vibe Vipers! Or more likely this: Purge pump.
https://www.youtube.com/watch?v=9EREwCYvX5c
gtv237
Posts: 387
Joined: Fri May 23, 2014 6:21 pm

Re: Hissing noise underneath the rear bumper

Post by gtv237 »

Totally normal. It's the EVAP system testing itself.
2008Vibe
Posts: 3
Joined: Sun Aug 09, 2015 9:07 am

Re: Hissing noise underneath the rear bumper

Post by 2008Vibe »

Chiadog wrote:I think your car is infested with a nest of Vibe Vipers! Or more likely this: Purge pump.
https://www.youtube.com/watch?v=9EREwCYvX5c
Thanks for the info! Did a lot of searching over the interwebs and nothing. "Purge pump" was the keyword I needed.
Last edited by 2008Vibe on Fri Jul 29, 2016 6:49 pm, edited 2 times in total.
2008Vibe
Posts: 3
Joined: Sun Aug 09, 2015 9:07 am

Re: Hissing noise underneath the rear bumper

Post by 2008Vibe »

gtv237 wrote:Totally normal. It's the EVAP system testing itself.
Good to know, thanks. I was about to dismantle the under carriage and look for a gps tracking device :lol:
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