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OK, I really don't know where to post this. When my car is turned off and I'm just sitting there, I hear what sounds like knocking coming from the trunk. I sound like a crazy person, but my girlfriend and brother both heard it. Lol I looked in mY trunk, no one is in there by the way. I have a tool box and other stuff, but nothing is loose to randomly make the noise. It knocks like 4-5 times usually. Any ideas of what is doing this?

2005 cobalt base model coupe
 

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Casper, the friendly ghost!
 

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That is your Evap solenoid cycling, if you don't hear this you will probably have problems filling your tank with gas. Depending on how pressurized your tank is, when you stop your engine, and the outside barometric pressure, it can take between 4 and 6 actuations to equalize the tank pressure.
 

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maybe next time..
 

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Casper usually hides under the hood.....
 

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i thought i've saw him once coming out of the exhaust..
 

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After seafoaming the engine?
 
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