NHTSA Complaint #10456729 — 2004 FORD F-150

SINCE APPROXIMATELY 120,000 MILES, THIS VEHICLE HAS EXPERIENCED SPARK PLUG FAILURE AT A RATE OF ABOUT TWO EACH 5,000 MILES. PRIOR TO THIS PERIOD, THE VEHICLE HAD NO HISTORY OF SPARK PLUG FAILURE. THE PLUGS WERE CHANGED IN ACCORDANCE WITH THE MANUFACTURER'S RECOMMENDED SERVICE SCHEDULE AROUND 101,000 MILES. BETWEEN 120,000 AND 142,000 MILES, EIGHT SPARK PLUGS AND TWO COILS FAILED DURING NORMAL DRIVING CONDITIONS. AN ADDITIONAL TUNEUP AND COMPLETE SPARK PLUG REPLACEMENT WAS PERFORMED AT 142,000 MILES AFTER TWO FAILED DURING NORMAL FREEWAY DRIVING CONDITIONS. ANOTHER SPARK PLUG BLEW OUT AND WAS REPLACED AT 148,000 MILES. IN ADDITION TO SPARK PLUG FAILURE, SEVERAL OF THESE PLUGS HAVE BROKEN WHILE BEING EXTRACTED, CAUSING NEEDLESSLY EXPENSIVE REPAIRS. *TR