Well I finally got the guts to pull the plugs.I bought the remover tool and the rethreader kit and the champion plugs.Only needed the plugs though.They all came out.I did them early @29k so I thought they where very hard coming out took my time and followed tsb and all came out.Cant see waiting longer than 30k and expecting them to come out.Added 2mpg and truck runs just as good as with the motorcraft plugs in it.Engine temp I think is the main key.
Good luck to all.

 

Don't see how the plugs could add 2 mpg unless you've been running bad (cheap) gas and fouled the factory plugs. Can you post a picture of what the stock plugs looked like? When Champion comes out with a colder version of the plugs I'm going to buy a set for my supercharged truck. Brisk has a one piece plug for it but they require changing about every 25K and its a PIA to change them.

 

They looked pretty worn already .I already tossed the plugs but they had a reasonable amount of carbon on them .I had and still have not the best idle a very small bounce dont know if this is comman but seems to run o.k.The mpg before was 9.4 now around 10-11 is that goodm for this truck just got it.went from chevy to ford to get all the horror stories.

 

Damn I thought the 12.8 MPG I'm getting was bad.

 

The differences we encounter are really amazing. My dealer changed my plugs at 65,500 and had no problems. The truck was running great before and I can tell no difference. Also, same gas mileage. My old plugs were a little discolored but otherwise looked perfect. No wear at all. I run Shell, Texaco and Conoco, all gas with good detergents. One other thing that probably makes no differenc, for the last 36,000 miles, I had a tuner on it, the Edge.

 

I think if you follow tsb its doable.it seemed to me that temp was a major factor let engine get to cool and plugs just stop turning.and as for the mpg thing what is norm for a 05 screw

 

asking what is norm for mileage is about as good as asking what religion is right....you'll never get an answer that sticks.....your mileage is about as low as i've heard of...i average around 14....and i've heard of people getting average around 16

 

4x4s don't get as good as 4x2s, plus wheels size and tires, the area you drive, all kinds of factors. I have the 4x2 XLT Supercrew with 3.55 gears. I get 16.5 to 17 around the Dallas/Fort Worth area. On the highway, I get 18.8 to 19.2 driving 75 to 85 mph.

 

Iget around 15 mpg on my 04 4x4scab according to my edge custom bent exhaust, everything else stock i think its a little higher than that where is this tsb and what is this special removal tool everyone is talking about

 

My last tank gave me a combined mileage of 15.23 I got 457 miles out of the tank, and took on 30 gallons to refill it. Mostly city driving.

 

When did champion come out with these plugs, when I did mine a few month ago they did not offer any plugs for the 5.4L. I used the autolight HT series. I see that the champion plugs are boasting a one piece design that will not break off in the engine, If thats the case, it may be the way to go

 

I Used Champion 7989 Plugs Pay $10 Ech. 1 Piece Plug And Seems O.k For Now.there Was No Way In Hell I Was Putting That Pos Motorcraft Design Back In.i Guess If They Change There Design They Might Admit To A Design Flaw And Be Somewhat Responsible For There Sorry A** Design.getting Sorry I Made The Switch To Ford Now.never Had So Many Problems !@29k

 

Thats a 20 dollar spark plug in Texas....????

 

Hi bigdokk9, did you changed the spark plugs when the engine was warm? or cold? 1st TSB recommended warm but 2nd TSB said cold. I am confused. Also, where did you buy the Champion 7989 for $10 a piece?
Thanks in advance for the info.

 

I pulled the plugs when eng was warm did one plug at a time as soon as the plugs started getting tight again I started truck for a couple of minutes and then moved on to the next one.DONT RUSH it they will definitley break.as for the price on the plug it was 9.?? each think they listed for 18-19 I pay wholesale im a tech at a shop if you know a tech ask him to get them.