Two problems related to engine overheat have been reported for the 1998 Ford F-150. The most recently reported issues are listed below.
1998 Ford F-150 pickup truck with a 5. 4 liter triton engine. Without engine ever overheating, a spark plug was ejected from the cylinder head. The plug's threads were stripped. Estimate to fix is about $2200. 00.
Lost #1&2 cyl due to warpped head. Engine never overheated. Engine pinging at light loads even with 92 octane gas. Research shows this to be more than a chance occurance with the triton engine.