Ok driver side rear spark plug is always a death wish for me. it comes out so hard. one day its going to snap off. antisize always applyed. all other cylinders come out easy. Ideas

 

What the issue? Can't get leverage on the wrench or it gets so seized up you can't break it loose?

 

Chase the threads -- use a thread chaser, NOT A TAP!

 

replacement plug threads in so easy. Chase the threads, Never done that. Whats the tool needed.

 

It takes every thing i have to move the wrench, without a johnny bar. Its in Hard,

 

A spark plug thread chaser.



PS: If the thread chaser won't fix it, you should grab a borescope and look in there to see if you've got a torn thread (torn away from the surrounding metal, that is). If you've got a torn thread, the only right thing to do is to remove the head and Heli-Coil it -- you don't want that little shred of metal breaking loose and falling into the combustion chamber where it's going to be just enough to do expensive damage. If the chaser won't fix it and there's no torn thread you've got some sort of failure I've never seen before. That happens -- I'm not, have never been, and have no plans of becoming a professional mechanic.

 

Which chaser is better, Lisle or Autocraft?

 

I've no idea. Looking at the photo of the Autocraft on Advance Auto's web site, though, it looks to be very poorly finished:


If I found that one in my toolbox I'd throw it away. If my graphics designer were responsible for making a part of good quality look that bad, I'd throw her away.

 

I've had the Lisle for years and it works fine, no idea on the Autocraft

 

A tip is to put grease on the chaser(cut outs), It will catch any metal fragments that come off instead of it going into the cylinder.