Originally Posted by doug68
I recently replaced my timing belt and when I started it up a piece of plastic broke off the cover and caused the cam to jump six teeth. I reset belt but now I get p300 p303 and p 305 codes. I suspect bent exhaust valves. I am going to replace the cylinder head. Does this sound like my valves are bent?
What actually 'broke-off the cover'? I'm struggling with how something broke-off and 'caused the belt to jump'. There is a sensor that sits under the cover....is this what broke-off? If the sensor is out of commission, I'm guessing it could throw those codes. How is the car running now? The codes are obviously misfire codes, so it should be pretty obvious if engine is running rough or misfiring. It is an interference engine, so if the belt jumped 6 teeth you may have damaged some of the valves. Although hard to say, I had mine jump 4-5 teeth once when the tensioner stopped working and it did not cause any damage (car still running great). Did it jump on both banks or just one?
If car is indeed not running right, would start with a compression test as suggested here. I never had to replace the head on the KIA, so don't know about any pitfalls. But it looks pretty straight forward. Hopefully it is limited to the valves and not piston crowns. Good luck.