Spark plug ejected from cylinder head
ENGINE
21 NHTSA complaints · 2012-06 → 2017-09
“SPARK PLUG BLOWN OUT OF HEAD. SPARK PLUG #7 BLEW OUT 9 MONTHS AGO. NOW PLUG #8 BLEW OUT. MECHANIC SAYS IT'S DUE TO POOR DESIGN OF ALUMINUM HEAD AND INSUFFICIENT THREADS. BOTH TIMES, THIS HAPPENED WHILE COASTING AT A SLOW SPEED (< 30 MPH)”
“THE SPARKPLUG BLEW OUT FOR THE SECOND TIME. THE FIRST TIME WAS ABOUT 9 MONTHS AGO. RUNNING FINE THEN ABOUT 40 MPH THE PLUG BLEW OUT”
“WE HAVE A FORD F150 CREW CAB WITH A 5.4 TRITON MOTOR. I WAS PUTTING IT IN REVERSE TO DRIVE AWAY AND THERE WAS A STRANGE POPPING SOUND. I INSTANTLY SHUT IT OFF AND OPENED THE HOOD”