Changing spark plugs and I want to do it right. What are the best recommended plugs? 2010 5.4.

Also, where exactly does the dielectric grease go?? Im reading different things.

 

One thing that I can say is, invest in a good torque wrench and properly torque the new plugs. Too tight and you can strip the head, too loose and the plug and back out over time and be spit out while driving.

Also, don't use anti-seize on the threads, it will change the torque reading.

The dielectric grease goes on the plug contact, where the coil pack attaches.

 

Motorcraft plugs, never never ever use Autolite.

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Hi.

MC SP-509. No reason to use anything else, on a stock engine. Try Rockauto.com.


Dielectric application:

1. Grease the plugs ceramic before install. This assures proper seat. Without it, the COP boot may buckle.

2. Pull the boot, then give the spring a couple tugs to make sure the spring to coil blade connection is secure.

3. Grease the entire inside of boot to protect against moisture and to focus coil pulse to the spark plug. Without it, pulse jumps, etches and leaves carbon trails inside of boots. Boots become weak and can deform.

4. Install the boot over the spring and onto the coil. With a small screw driver or curved pic, pull the spring from the end of the boot approximately one half inch. Slide the screw driver across the spring, keeping it from recoiling back into the boot.

5. Clean grease from spring end with a grease cutting agent. Lacquer thinner or brake cleaner works best.

6. Release spring so that it recoils back into the spark plug boot.

7. With a small brush or finger, grease the top seam of the boot.

8. Install coil.

 

Wonderful!!! Thank you very much!! I have a great torque wrench. Do you guys know the torque specs??

 

Based on my research, why can I get a clear answer on what the gap should be??? I have read that all these 5.4's (all years) should be gapped to .54. Then I read that the 2009-2010 should be .42. Any ideas?

 

Hi.

Directly lifted from the 2010 F150 Owner's Guide (3rd printing), page 405:

5.4L V8 Engine Spark Plug Gap

0.039–0.043 inch
(1.0–1.1mm)

 

Cool!! Thanks man!!