I went to change my spark plugs today and when I got started on the #1 it wouldn't turn. It was on there tight and I definately don't wanna put too much oomph behind it and break a plug. So while I didn't try any others, I'm almost sure the #1 is siezed. Does anyone know what I should do or anything I can try to loosen it up without stripping threads or breaking plugs?

* I'm not sure if the previous owner changed the plugs or what, but they haven't been changed in the 3-4 years I've had the car (always figured I'd wait til I got headers)

 

It's difficult to say with out being hands-on. You don't need to worry about breaking the porcelain part of the plug, in fact I've occationally broken them delibrately to get more room. It's almost impossible to "break" the steel part.
You can of course strip the threads especially on aluminum heads.
One thing that I've found works very well is what might be discribed as slapping the wrench. Get the shortest socket/extention that will fit, put some tension on it with one hand and hit the end of the wrench hard with your other hand. This will put a "shock" load on the plug, bolt, nut, and it will often break free without stripping the threads.
Outside of that all the usuall things, WD40, heat, the old wax trick, that kind of stuff. Good Luck.

 

Cool deal. I just didn't want to mess anything up (stripping threads was my main worry) and end up having a cheap spark plug change end up costing a small fortune. What's "the old wax trick"? I don't guess I've ever heard of it.

 

PB Blaster.
Spray.
Let soak for a few hours.
Spray again.
Easily loosen plugs.

 

Just use a breaker bar and lean into it. Itll let go. Overtighten it and you run a risk of stripping the threads.