Ohhh, I thought you meant like server-dead, because it was when I tried to go to them. Don't worry, though. Forums just won't explode overnight.
We are. Think of your forums (or website for that matter) as your baby. It doesn't just walk on it's own. Just because you have one out there doesn't mean it will succeed. You must nurture it, care for it, (promote it), etc etc. Things take time. Search engine placement is also key. Have you added your site to search engines?
Yes, search engines are very helpful. I recommend going to http://www.dmoz.org and submitting your site to an automotive category (or whatever you feel would be best). It shouldn't take too long to be accepted, and your site will be in the directory, which is used by Google, which is used by Yahoo, which is used by hundreds of other search engines around the world.
Give it time Mustang Man. Like all say, it doesnt happen in one night.
Be patient and the world will be at your door.
You can also check out www.addme.com to your list, they may help also.
Good luck and BE patient.