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If you buy Motorcraft or another high end brand they are going to cost you a little bit more than plugs.

If you're not having any issues you are probably just wasting money replacing them.

When you pull them out to swap the plugs, it might still be a good idea to put die electric grease on the boots.

Lawncare101

Well I decided over the weekend to break down and do mine.....here is what I have so far. Mine is an 06 and I bought it used three years ago and of course had no idea if they had been changed or not. I have been in and worked in the automotive market for around 12 years and this had been the only maintenance job to terrify me! I have been procrastinating for 2 years to do it. So here we go, I had a guy from a Ford dealer tell me to use an impact on them and They wouldn't break. I was extremely reluctant seeing as how these are aluminum heads.....many ppl use seafoam and say "it helped". I run Amsoil injector cleaner and of course its all opinion and who really knows if it does help. First I did spray som PB blaster in each plug hole before starting. The first plug I used a ratchet and it did break, I already had the Lisle removal tool and it worked like a charm! The second and third plug I used an impact and it brought them out in one piece. If you do decide to use an impact use low setting and use shirt bursts, once the plug begins to turn BACK off the trigger and go slow, the vibration of the impact breaks the carbon loose. The number 4 plug I couldnt an impact on and yes it broke. Cylinders 5 thru 8 all came out in one piece using the impact. Ok so now I've been at it for 9 hours and have a 7 plugs DONE. Here is the problem have and I PRAY someone can help. The number 4 cylinder did not break the typical way they do, if anyone has removed a broken plug you will understand what I am asking. The first plug broke"correctly", meaning when the upper porcelain was pulled out the electrode came with it and the pusher tool was able to push the remaining porcelain into the tip and the extractor pulled it right out. Now, #4 broke in pieces and the electrode still remains in the tip therefore the pusher tool cannot push the porcelain down to allow the extractor to thread into the tip. Also I cannot see down the plug hole without a mirror and flashlight. I had a buddy suggest disabling the fuel and ignition and crank the engine in hopes it might blow the tip out, I'm somewhat uneasy attempting that. Has anyone had this happen or have ANY ideas how to get it out WITHOUT removing the head???????????? Please help!!!

sleepyhollow

As so many of us I was stressing about replacing the spark plugs. I ordered new plugs according my vin number I needed the mc515, no problem. I got the Lisle tool as well and the spark plug socket.
Yesterday I started, built up the courage to do it. Watched tons of youtube videos and read tons of stuff on this great forum.
When I started taking the coils out. blowing out everything with compressed air and sprayed aero kroil penetrating oil in there and let is sit for 12hrs.
The coils looked to new so I had a feeling that these plugs might have been replaced. Oh I bought the truck when it had 80k miles on it and was 3years old. So I thought those were never replaced. I has now 116k miles.


Anyway... all plugs came out great because it had the mc509's in there.
But according the vin it needs the mc515. So what is going on here??


I'm clueless right now. Were these cylinder heads replaced.


These are two completely different type of plugs. There's no way the 515's would fit in there, they are a little wider and the threads is shorter. If you google them you can see the difference.
Thank you guys.

hacker

I had mine changed about a couple of months ago, it took the guy about an hour to do them and no plugs were broken. Hearing all this talk about them breaking, mine came out very easy.

TriumphNut

Thanks, you mention timesaver tips other's have not noted. Had I known of this plug design, would not have bought this pristine 20O7 SuperCab. Only has 60,000 on it a couple of years later and runs like a champ. BUT, Sucks up gas like a Buick DynoFlush.