1999 FORD EXPEDITION WITH THE 5.4L TRITON ENGINE BLEW OUT A FACTORY INSTALLED ORIGINAL SPARK PLUG CAUSING A ENGINE FIRE. THIS SEEMS TO BE COMMON AMONG THIS PARTICULAR ENGINE. FORD WILL NOT ACKNOWLEDGE A DEFECT IN THE DESIGN, BUT ONLINE RESEARCH CONCLUDES THIS PROBLEM IS WIDESPREAD AND VERY DANGEROUS. FORD SHOULD BE COMPELLED TO RECALL THESE ENGINES AND REPAIR OR REPLACE THE ENGINE AT NO COST TO THE CUSTOMER. *TR