i have a friend with a ls and when she starts her car somtimes is sound like someone is knockind on the back window any ideas what this might be?

 

A ghost....



No, really I have no idea. I used to have a knocking but that came from the engine. Never heard it from the back window.

 

Searching can do crazy things

 

lol i told her theres a monky in her trunk

yea but im lazy

 

so are we.

 

This?

 

thank you for the help

 

No problem. It bugged the hell out of me when I first noticed it. It still catches me off guard. ha ha

WTF was that

Turns head slowly hoping not to get killed by someone hiding in car

wheewww just that noise again

 

its a latch..

 

hear that noise all the time and i always look back thinking someones trying to talk to me haha, but there's nothing wrong right?

 

its your trunk latch checking itself. Both of my cobys have done it. Perfectly normal.

 

i swear to ******* god that i hear that same thing all the time. i only hear when im stopped or when i just turned my car off and im sitting in it for a few seconds longer. it scares the hell out of me. i hear it behind me. wtf is that ****?? i thought i was crazy but i guess im not!

 

Heres the ghost of the EVAP canister WWWHHHHOOOOOOOOOOO

#PIC4317C: Noise From The Rear Of Vehicle - keywords canister cold CVS click evap knock L61 LE5 solenoid tick vent - (Jan 31, 2008)

Subject: Noise From Rear of Vehicle

Models: 2006-2007 Saturn ION
2006-2008 Chevrolet Cobalt
2007-2008 Pontiac G5
2006-2008 Chevrolet HHR
2005-2008 Pontiac Pursuit
with Engine RPO L61 or LE5

This PI was superseded to update models and model years. Please discard PIC4317B.

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:

A noise may be heard from the rear of vehicle; typically 3-5 knocks during initial cold start. The noise may sound like someone outside of the vehicle is tapping on the back window or on the rear exterior body panels.
Recommendation/Instructions:

This noise is from the vehicle's EVAP canister vent solenoid going through the diagnostic cleaning cycle, which is part of the software calibration set-up. Replacing the EVAP canister may not resolve the issue when the vehicle is re-exposed to a cold start. No parts should be replaced. This should be considered a normal condition for 2008 and previous model years.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

 

mine does it too, glad to know what it is. i used to turn around like wtf. and look hahah

 

Except mine does it too and its an 05. Almost sounds like someone is in the trunk or tire well knocking. haha I've gotten used to it but my girlfriend is always like wtf was that??? haha

 

My '05 does it too. The dealership told me the same thing though as the above TSB post.

 

good too know ! i was wondering what that knocking was.

 

This should be considered a normal condition for 2008 and previous model years

 

wow, cant say mine has ever done that...

 

Yay! Mr ghost has been exposed

 

i have an 06 2.2 and have never noticed it, maybe i should turn down the radio...

 

Thats true, but if you look at the year range on that TSB for the Cobalt, 2005 isn't included. Its only 2006 through 2008.

 

i thought i was my crazy ass drivin someone i cut off comin after me...lol