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I just purchased a 2013 Kia Optima LX with a four cylinder. I had a seven day "no questions asked" return policy on the car. On the eighth day I noticed that the exhaust was producing a ticking / tapping / knocking sound (both while running and after shut off). It taps randomly (like popcorn popping), not consistently like at a fixed rate. Really hope I don't need a new Catalytic Converter, anybody know what this might be?
Thanks in advance,
John


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Location: Oregon
it sounds like the exhaust metals are making noise from heating and expanding and cooling and shrinking back down. (just from your description)


   
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