ive got a pinging sound comming out of my motor its comming from cylander 3 and 4 i think i also hear it from under the intake mani side and im not shour if its detination i switched to colder plugs put new radiator fluid and water wetter im thinking sence i am burning a lil bit of oil it could be carbon in my cylenders and if it is then do any of you know wut cleans that shit off without taking the head off thank you and im sorry for the run on sentence.