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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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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?
You did get an answer I hope. I have two Optima’s 2012 and 2011 with brand new engine because of the same issue. FOR FREE!
 
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