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I have a 2015 kia Optima sxl turbo. It use to run very quiet. Now it is idling very rough and can here it running rough. It only has 39k and gas mileage has gone down a bit. Any suggestions?
 

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2013 Ebony SXL Turbo: Original Everything @ about 189K with Drag wheels.
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Any CEL or pending CELs?
 

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2013 Ebony SXL Turbo: Original Everything @ about 189K with Drag wheels.
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350 Posts
Well with nothing obvious there, in general on other cars folks would perform a 'tuneup' in these situations. I would check the air cleaner (engines burn about 15 times more air than fuel), then maybe pull a sparkplug or two to see what story they tell. It would be rather early for new plugs, but if you've got some money to spend on that you could try that. Then there's the Kia suggested techron fuel treatment, not really sure if its just a fuel additive or if it is injected thru intake.
 
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