Please help ! I'm new to posting , but I could use some advise. I've been following all the posts on the plug changes and feel I'm good to go on changing my plugs. I have a 2004 5.4 3V with 29,000 miles. Should I put in Motorcraft SP 421, PZT1f, or PZT2fe f4 ??? Motorcraft doesn't even list these on their home page. Or Possibly Autolite HT1?? Any advise would be appreciated. Also, where are any of these plugs available on line?

 

You can find the plugs at 1stfordparts.com and search for part number SP-462. They have them for $7.84 each.

 

thanks for the reply, It seems that several of the Motorcraft plug numbers will fit. Is Motorcraft just replacing one number with another " updated" number or what? Very Confusing. Of course, Ford didn't list any plug number in the owners manual or on the engine specs decal. Simply said "see dealer".

 

Keep in mind some of those are the older plugs, some are for the 3V Mustang. The SP-462 is the newest plug for the 5.4L 3V. I went to the Dealer and asked them to pull up their prices and they're deal for me was $13.75 a plug, what a deal!

 

Had same question last week,used sp-462 (PZT1F) on my '05. Check this thread:
here