of course it works, it works really good for anything visual, you should also try instagram as well. As for pinterest, start with the basicas, grow 5-10 boards on different car related keywords, follow people, comment, re-pin stuff from other people and also update your boards daily, in a few weeks you'll start to see everything moving.
I dont think Pinterest is really worth the effort for cars. Recipes and Handbags is really where its at.
(Should clarify. Own some big car boards. Get some interaction and a little traffic but not worth the effort compared to the time it took to build up to big followers)
I've never been into the car niche to be honest, but I don't think it would work too well on Pinterest.
Keep in mind 80% of pinterest members are female. And over 90% of pins are from women (src: http://marketingland.com/report-92-percent-pinterest-pins-made-women-83394)
I believe pinterest is a bad social network for manly stuff like cars. I would favor Facebook or maybe IG.
just try it ... i guess its not to popular there ... go for tumblr