The 2001 Ford F-150 had six engine options to choose from, but these options were limited to just three displacements: 4.2-liter, 4.6-liter and 5.4-liter. Ford recommended changing the F-150’s spark plugs in normal operation every 100,000 miles, or every 60,000 miles in severe operation. All of the V-8 engines required the same spark plug torque, while the 4.2-liter six-cylinder had its own spark plug torque requirement.
Spark Plug Torque
The spark plugs in the 2001 Ford F-150’s 4.2-liter engine require 11 foot-pounds of torque. The spark plugs in the 4.6-liter and 5.4-liter engines require 13 foot-pounds of torque.