My 97 TJ is weird like that too. Most keys I get made won't work, but I finally got one made that would start it, which is ok with me, because I don't lock the doors either. It works the tailgate only if it's turned the right way, and that's the only thing I might lock if I ever get an Instatrunk. I figure the locks are just worn out. I also can't for the life of me get the ignition switch to turn backwards, which sucks because I had to wire my radio to have power available all the time so I can listen to it with the jeep off if I want.