Before you start cutting or breaking things, slow down and perhaps get a second pair of eyes and hands on the task. The other 7 came out, this one will too and without damages.

On that same line, slowly (very slowly) turn the socket as you apply downward pressure. You may simply be missing the sweet spot to allow the socket to seat on the plug.

 

Ed something that might help on future search's is to utilize Google. Quite often I've been in the same boat as you with the Rennlist search function being useless. But then switched to Google and searched under Rennlist 928 forum and then what ever I'm trying to find usually comes up with something relevant.

 

Thanks for all the comments guys. I've tried them all, no joy. I will take a picture with the cell phone, per Dr Bob, and see if I see anything I haven't seen before. There is no crud or foreign objects around the plug keeping the socket from gaining proper purchase on the plug itself. Breaking the plug may be a solution.
It may be that what Dr Bob said has occurred and that the plug has stretched out from the ceramic

 

dont break the plug as there is a chance the ceramic can also fall into the cylinder.
That will leave a mark.
If you have a 6 point socket that wont work try a 12 point deep socket
if need be have it machined so it will fit into the plug well.

NOTE at this point forcing this will possibly cause more damage than getting the tool that will fit

 

Just a thought from the info you've given. If the other seven plug have no problem, then I suspect the 8th plug might have a crack between the threading and the plug body. At this point, don't force it and try turning the socket to see if it is completely loose or there is a slight binding which tells you that the plug itself is loose between the thread shoulders and the hex body. If that is the case, perhaps the only way is to break the plug itself and use some extraction tool to pull it out.

 

I went through that with 2 of my Mustangs, which used a 2 piece plug. They would fuse to the wall of the head and break. Once, I had 4 out of 8 break. Talk about *** pucker moments. I used a Lisle tool to extract them. Everything worked out, but it made me queasy none the less. I try to be very careful. I'll grind the deep sockets to try and make them fit into the hole. Here's a picture of the hole, and you can plainly see where the cam cover is slightly out of alignment with the head.

 

It kind of looks like a piece of the spark plug wire is on the top of the plug, the metal clip.

But I’m looking at it on my phone so could easily be mistaken.

Good luck, you’ll get it.

ETA What type of spark plugs came out of the rest of the car?

 

That was my first thought as well. Check the end of the spark plug wire, see if the metal clip is missing.

Rich

 

Ed,

Try needle-nose Vise-Grips or similar to remove the wire connector fitting on the end of the plug. It should thread off if you can get the right grab on it. It's a crapshoot after that whether the end of the plug wire will come off. Same needle-nose -might- get a god enough grab on that stuff to get it off the insulator.

 

What's the "yellowish" stuff around the hex part of the plug? Optical illusion, or?

 

I'm getting anxious reading this thread. How about a powerful vac or compressed air if something accidentally fell inside the well.
Crossing fingers for you @linderpat

 

Brian - that's the bottom of the chamber. They are brass colored. All of mine are like that. I'll post some pictures later. I'm heading to the garage again. I'll see what I find all. I'll try Dr Bob's suggestions first (although I did try needle nose pliers to thread out the plug itself, but that isn't working).

 

We have a winner! (3 actually). Using Rick's socket again, but this time pressing down real hard and turning it like trying to feel the tumblers on a bank vault, and considering the plug looked longer as was speculated, I found purchase, and got the plug out. As you can see below, the plug itself is not rounded. The top of the plug somehow became unscrewed, and I think that was causing all of my sockets to not seat all the way on, causing the slippage that was occurring. All of the clues here were enough to pump my confidence and figure this sucker out, and get it out without damaging anything, including the old plug. You guys rock

The winning tool.

The winning process.

The winning clue.

Thanks all.

 

I don't know.
How many listers does it take...
to change a spark plug?

 

That plug was leaking too.