CONSUMER HEARD A KNOCKING THEN A BANG NOISE FROM THE ENGINE. THIS OCCURRED WHILE GOING UP AN INCLINE AT 30 MPH. THE NOISE WAS FOLLOWED BY SMOKE. THE CONSUMER THEN PULLED OFF THE ROAD AND WITHIN SECONDS THE ENGINE WAS IN FLAMES. PRIOR TO THIS INCIDENT THERE WAS KNOCKING IN THE ENGINE, AND DEALERSHIP REPLACED A CYLINDER BECAUSE IT WAS BAD.*AK