Hope someone can shed some light on my issue. I just bought this rig with 50k miles on it. The problem is I hear a knocking/tapping sound behind front drivers tire. It sounds fine on startup but after its warmed up for about 15 minute the sound shows up. I took it to a mechanic and he used his stethoscope and says it's top side between first and second cylinders. I've gotten under the car and to me it sounds like it's inside the oil pan. Another mechanic told me it could be the bearings rod or main and that I should get rid of the car. Second mechanic thought I Should take it into Kia and have them check it out. Perhaps there's a tsb about this. I did find the tsb on oil control valve. The car hesitates at low rpm, seems off timing, possibly surges. But once I hit 2500-3000 rpm it goes like a top. And there are no trouble codes. I'm worried that my new purchase could turn out to be a VERY big bill.