Anti Seize

torque to 13 ft-lbs per dealer ship

Gap new plug at .045" and apply liberal amounts of High Temperature Anti-seize lubricant (e.g. Napa Copper Anti-Seize). Don't skip this part. Anti-seize is needed when two disimilar metal threads are in contact (spark plug = steel, head = aluminum).

This is a grease that goes on the threads of the spark plug. Its purpose is to prevent the seizing of the threads in the hole. Steel spark plugs in aluminum heads are prone to doing this.

no dont force spark plug its trying to cross thread.back spark plug back out.apply thin coat of anti seize compound to spark plug threads.if you have problems getting spark plugs back in a hard to reach place, use a long piece 3/8 vacuum hose about what ever length you need.place vacuum hose over spark plug insulator then install spark plugs to hard reach places to keep from cross threading.if plug tighten 1/4 turn.back out spark plug and try again.dont cross thread or you have to remove cylinder head.if spark plug hole hard to reach to retap or install thread inserts.

depending on which engine you have ... some are very difficult (nearly impossible) to get to the back 4 plugs ... you cant get your hand back there to even touch the plugs on some ... others have lots of room ....i gave up on one 96 model and took it to a good dealer .. i asked "how do you get the plugs out without taking the engine apart ?". he said "we take the engine apart" ...i think they remove the intake manafold and maybe the rear valve cover ... he wouldnt tell me ... the ignition system in that car is very good and plugs can be terribly warn and still work ...i have seen 100,000 miles on standard plugs without misfires ...when i do change the plugs i put in the best i can find ... dont want to do that agian for a while ... i had the dealer install only the back 4 plugs and labor was around a hundred dollars ...its a good idea to use anti seize compound on the plug threads .. lacking that they have a way of welding themselves in aluminum heads if not changed periodically .. the front four plugs are easy to get at and all you need is the proper size spark plug wrench .. on smaller engines or later model caravans there is much more room behind the engine . .. still a bit hard to do since you cant see what you are doing back there but at least do-able .. dont over tighten the new plugs since that increases the chance of welding ... some plugs come with anti seize already applied and gap preset for your engine.

Plug torque is not critical. Best way to tighten them is to run them in finger tight to make sure the they are not cross threaded, then tighten enough that you feel the gasket crush. (plug bottomed and just a bit more).
It is essential that you use anti-seize compound on the threads. That will prevent the plugs from seizing into the heads and snapping or tearing the threads out when removing the next time.