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Hi there! Currently, I have but one issue with my 2007 LT - she knocks at me! After about 5 or 6 minutes of the engine being on, a knocking comes from the rear driver's side. It's 5 knocks, exactly like someone is knocking on a door. Always exactly the same. Has anyone else experienced this?
 

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That is your emission vent canister cycling, all normal some are noisier than others. It sits behind the fuel tank passenger side.
 

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I always heard it from the engine bay, but same exact thing. Never had a problem with it.
 
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