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Knocking Sound

1K views 1 reply 2 participants last post by  Redeshot 
#1 ·
I have a 2011 Optima 2.0 Liter Turbo. When in the passenger compartment, I hear a knocking sound that is not related to engine RPM, or HVAC fan speed. I cannot hear it when standing over the engine, but clearly hear it when I get inside the car. At cruising speeds, it is not heard, but at idle or < 20mph, it is heard. Any ideas?
 
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