New guy here. Just bought a 2000 F150 7700 and am doing a slew of upgrades and repairs. I have seen several YouTube.com clips on replacing 5.4 spark plugs. From what I've seen and read on this subject I see the replacement plug of choice is Motorcraft. I just discovered the new design 1 piece Champion 7989 plugs that won't break apart when its time to replace them. Anyone installed these in their 5.4 and what do you think of their quality compared to the Motorcraft product? Thanks.
For your year motor the newer style are NOT spec'd out----those are intended for the 3 valve heads. Use MotorCraft SP479's or the Auto Lite equivalent.
Too often in this forum its been proven the MotorCraft plugs work best in our engines.
I use nickel-based anti-seize and torque to 23 ft/lbs but some will disagree that's how best to do it.
ALSO check your COP boots, replace as needed even if they seem okay for the moment---this is an area often over looked which causes problems, sometimes more noticeable after new plugs are installed. I use an NAPA/Belden p/n 702418; USA made, about $5 each IIRC.
just did my 2000 5.4 2 weeks ago....use motorcraft plugs. all the research ive done its the bast way to go. the torque is anyones opinion . plugs 7 and 8 are a bitch....i did not have to move fuel rail out of the way thou.