NHTSA Complaint #11051574 — 2002 FORD F-250

ON NOVEMBER 26TH 2017, MY TRUCK STARTED HAVING A SIGNIFICANT MIS-FIRE IN CYLINDER #4. TRAVELLING AT ABOUT 30 MPH ON CITY STREETS; THIS PARTICULAR INCIDENT WAS NOT A SAFETY ISSUE ALTHOUGH DIFFICULT TO LIMP THE VEHICLE HOME AS IT DID NOT ACCELERATE WELL. UPON REMOVING THE SPARK PLUG; IT WAS DETERMINED THAT THE CYLINDER HEAD THREADS IN THE SPARK PLUG PORT HAVE BEEN DAMAGED. THIS WOULD HAVE RESULTED IN AN EJECTED SPARK PLUG HAD THE VEHICLE BEEN CONTINUED TO BE OPERATED. SINCE THIS IS THE 3RD DIFFERENT CYLINDER THIS HAS OCCURRED ON WITH NUMEROUS REPORTS FROM MULTIPLE OWNERS OF THE SAME ENGINE DESIGN BY FORD; I HAVE DECIDED TO FILE THIS REPORT. THIS IS THE 2ND REPORT I HAVE FILED WITH THE NHTSA. THE FIRST REPORT I FILED WAS BECAUSE THE 2ND TIME THIS OCCURRED; A SPARK PLUG EJECTED FROM THE #3 CYLINDER AT HIGHWAY SPEEDS WITH A SIGNIFICANT REDUCTION IN SPEED IN TRAFFIC ON THE HIGHWAY. THAT OCCURRENCE ALSO CAUSED A SIGNIFICANT VIBRATION AND HAD TO BE PULLED OVER IMMEDIATELY. EVEN THOUGH THERE HAVE BEEN SIGNIFICANT REPORTS TO FORD AND DOCUMENTED OCCURRENCES DATING BACK TO 1997; FORD CONTINUES TO SAY THAT BECAUSE NO "SAFETY ISSUES" HAVE RISEN OR BEEN PROVEN TO BE CAUSED BY THIS ISSUE THAT IT IS NOT THERE PROBLEM. I WILL ALSO BE FILING REPORTS WITH BBB, CONSUMER AFFAIRS AND CONSUMER REPORTS.