WE WERE ON A CITY ROAD UPHILL AND DRIVING TO A FRIENDS HOME. OUR MAZDA CX-9 GRAND TOURING MADE A RATTLING NOISE, RELEASED A LOT OF WHITE SMOKE, AND LOST ACCELERATION. I IMMEDIATELY PULLED THE CAR ON THE SHOULDER AND A BY PASSER STOPPED HIS CAR ON OPPOSITE SHOULDER AND ANALYZED THE SITUATION AND SHOUTED MOVE YOUR FAMILY OUT AND MOVE FROM THE CAR SINCE ITS ON FIRE UNDERNEATH. WE IMMEDIATELY MOVED OUT AND BY PASSER CALLED 911. ALL THE TIME WHILE WE WAITED AND FIRE DEPARTMENT ARRIVED THE CAR WAS DRIPPING FIRE.