At first glance, it may look like a daunting task, but it really isn't. I did my '98 4.6 twice, and WAY easier than my '03 5.4.

1. Use OEM/Motorcraft plugs.
2. Be sure to blowout the plug wells with an aircompresser prior to removing the plugs. Put a small hose on your compresser and really get down in there.
3. duct tape your extensions and socket so they don't come loose in the plug well.
4. when replacing the plugs, start them by hand using about a one foot section of hose, this way you won't cross-thread.
5. Apply some dielectic greese in the plug wire boot.

Take your time. Start with the front plugs cause they are easiest and this will give you some confidence.

You can do it!

 

Oh and, no anti-seeze on the plugs and torque to 28Ft LBs.

 

Iridum Plugs OK--?

 

I have used NGK Iridiums for about 6 years now and have had no problems at all.

 

Reason I asked, have used them in my dayly driver (525i BMW) for the last 60k miles and fond them to be the best ever in the car--I changed all the others out every 30k miles and before changing them out I would feel a little blip at idle every onec in a while. With the NKG Iridums the car is running as smooth as when they went in fresh. Have used them in my wifes Toyota Tundra and my son's Honda Pilot (OEM plug in that one) and found the same results, smooth as a new sewing machine--gotta look at the tach sometimes to tell if the car is running when your at idle.

 

I put 50,000 on a set of the NGK Iridiums without one issue. Good fuel mileage too.

 

Auto lite vs motor craft platinum the guy at the auto parts store said these plugs come pre gaped. He said if you try to gap them you will mess up the platinum is this true? If the gap is wrong how do you gap and not mess up your plugs?