NOTICED THAT ENGINE WARNING LIGHT WAS COMING UP ON AND OFF, CHANGED SPARK PLUGS,WIRES, LIGHT WOULD GO OFF FOR A PERIOD AND THAN COME BACK ON. I WAS DRIVING DOWN THE FREEWAY BETWEEN 65-70 MILES/HOUR WHEN I HURED A LOUD BANG , PULLED OFF THE FREEWAY, I HAD THE CAR TAKING TO A LOCAL FORD DEALERSHIP, SERVICE WRITER TOLD ME THAT THE VALVE SEAT IN THE HEAD HAD SEPERATED AND FELL INTO THE MOTOR. HE ALSO TOLD ME THAT THE 1.9 MOTOR HAD A FLAW IN THE HEAD AND FORD MOTOR COMPANY NEW ABOUT THIS PROBLEM FOR MANY YEARS. THAN HE SHOWED ME ANOTHER ESCORT THAT6 HAD THE SAME EXACT PROBLEM AND THAT THIS WAS NOT THE FIRST CAR HE SEENED WITH THIS PROBLEM. SECOND PROBLEM: I HAVE HAD TO REPLACE 3 TRANSMITIONS WITH IN A YEAR, WHICH WAS COVERED BY FORD MOTOR COMPANY AND POSSIBLY A 4TH. I DON'T KNOW BECAUSE THE MOTOR WENT. THIRD PROBLEM: WHILE AT A STOP SIGN A WAS REAR ENDED AN ABOUT 30-35 MILES/HOUR, MY SEAT BELLT DID NOT HOLD ME AND MY SEAT COLLEPSED ON TOP OF MY CHILD WHO WAS IN A CAR SEAT BEHIND ME. THE CAR WAS IN THE SHOPE ABOUT THE WEEK BEFORE THE MOTOR WENT AND THEY TOLD ME THAT THE PROBLEM HAD TO DO WITH THE TRANSMITION BUT I BELIEVE THAT THE COMPUTER IN THE CAR NEW THAT THE VALVE WAS PREPERING TO FAIL. I WAS ALSO TOLD THAT THE FORD MOTOR COMPANY HAD REDESIGNED THE HEAD, SO THIS PROBLEM COULD NOT HAPPEN AGAIN.