what part number is the new improved spark plugs for a 2006 f150?? The ones that don't break off. Thanks in advance Dallas

 

All Motorcraft plugs are 2 piece, but SP-546 is the latest revision. They shouldn't break if installed correctly. Champion and E3 make a 1 piece plug, but they don't work too well.

Clean the plug wells, coat the sleeve with high temperature nickel anti-seize, and torque to 25 ft/lb.

 

Thanks glc your always there for us members, saved me times before....

 

glc === What is the difference between the Sp 546 and the SP515 that autozone tells me I need..

 

SP546 replaces SP515. If they don't have SP546, order them online or go to a different parts store.

https://www.rockauto.com/en/catalog/...park+plug,7212

 

Yep, glc even saves me from my own messes and mistakes.

 

What is the difference between motorcraft SP546 PZK 14F and SP 546 PHZ 14F THANKS Dallas

 

No such thing as PHZ14F, but PZH14F is SP515. SP546 replaces SP515.