Why does my 2007 Chevy Cobalt knock after its been running for a short time?

  • Thread starter Thread starter Donella B
  • Start date Start date
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Donella B

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I bought this car brand new, my sister also has a Chevy Cobalt, and her's knocks as well. Why is this? It is embarrasing, because if you are outside of the car, you can hear it as well. And the seats seem to be so hard to keep clean.
It makes the knocking noise toward the back passenger side. It makes 2 knocking noices really fast. I was told its when the fuel injector kicks in but I think thats crazy.
 
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