i have a 06 f150 with two broken spark plugs in the head. i have used a kit that is made for removing broken plugs but it couldn't remove them. are there any other suggestions to remove them?

 

Did the tool offer any suggestions for the correct use? Some of the recommendations included to soak the plugs with a good penetrating oil overnight and make sure the engine was cool, which in this case is not a problem. There are many methods used and some work better than others. You might try Google , there are many methods explained there.

 

Which part is still stuck in the head? Is it just the metal lower part without the porcelain and/or center electrode?
There are several things to try.

 

The part that is still stuck is the lower part with the porcelain broke off in it with no electrode. I've already tried soaking it in carbon cleaner prior to using attempting to use the extraction tool. Thanks for any and all help.

 

I would try the largest size screw extractor (E-Z Out) which will fit the inside of the plug shell. If the hole passing through to the very bottom of the threaded part of the shell is small, drill it out as large as reasonable first. They are tapered, twist in reverse direction, thus get tighter as they are turned in an UN-screwing direction. Any chips produced may be removed from the cylinder using a magnetic flexible probe. Just my thoughts. imp

 

There should be a part that fits in the plug well with a hole in the center. There is another part that fits in the center hole you use as a thread chaser. When you screw it in and get a solid hold, there is a nut and washer that tightens up on the threaded tool and it pulls the broken part out.

 

Try this. http://www.etoolcart.com/06152.pdf

 

Well, there you go. There are several extractors, and they all work pretty well.
One thing to keep in mind. I DO NOT always recommend this; but, if this was my truck, I would see about the one-piece plugs that the aftermarket has for this engine. As I said, the one piece is just that, and just like the old plugs that somehow worked well for the first 100 years we made internal combustion engines, and they actually came out.
I don't like not using O.E. plugs due to the governments strict misfire monitors; however, if they don't miss, I wouldn't care.