What kind of spark plugs will perform the best in a 99 f150 5.4? I am looking for a really good premium plug plus don't want any problems later. Plus anyone have any links to em or a part number? Looking for performance and gas mileage but performance is number 1!

 

Motorcraft!

 

I thought the motorcraft plugs was weak and what was the cause of the plug problem on ford trucks? Does anyone have a part number and know neighborhood price range

 

Good grief! Motorcraft, for your truck.

 

you have a 99 2v 5.4..the 2004-2008 (maybe 2007) 3v 5.4 were the problems with plugs breaking off in the heads..

go to the parts store..tell them you need motorcraft, and ONLY MOTORCRAFT, plugs for your 1999 f150 5.4 and go change them..im not sure if the 99's have a blowout problem but JIC tighten them to about 28ftlbs and be done with it

 

Ok, sounds good then. Looks like motorcraft anyone have part numbers

 

i have bosch platinum plus plugs i just put in they have like 1,000 miles on them now and they work awsome no problems so far. 128000 on my truck now

 

trust me..change them out NOW!

bosch and fram kill these motors.

 

SP479 i believe

 

Hey great thanx a lot fellas I love u guys. U dudes never cease amazing me!

 

noticed your from killeen..i was down that way 2 weeks ago heading to san marcos!

 

Brisk makes a one-piece plug that shouldn't come apart if they hv 2 be removed later. Running them in my '04. Kinda expensive, if I remember

 

99's and 04's are totally different animals when it comes to spark plugs.

 

motorcraft or autolites. Ive got 35,000 miles on my autolites and good as new

 

Ok, ok .... seriously - these:

http://www.densoiridium.com/originofiridium.php

IT-16 is the correct part number for you.


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