I also do a pay per click thing with google that I really like as well. I just set a budget per month and it pretty much does everything for me. Again, HUGE increase in business from this as well since my competitor was the only other guy advertising online. My father owns a direct mail advertising franchise so I advertise with him as well but I dont see as many coupons coming back from him compared to people saying "I saw your ad online"
Yes, you definately want to do a Google Adwords campaign. BUT, when you get a call, answer the phone! People need to find a place to fix their car now and they will call the next guy in line instead of waiting for someone to call back. Also Google Ads will let you specify your location and a radius so that your ads are not shown to people who live Australia.
Twisted Rod? Not really sure the twisted rod/auto repair connection is positive. Also most of your customers don't know that car has rods or kanuter valves. So to them, I don't see the name as an advantage (I suspect most will think your name is Rod and you are a little weird). To the ones that do know that a car has rods, the image of a broken car part might be a deal breaker.
A buddy of mine opened a hand car wash. He was looking for names. I suggested "Handjob Car Wash". Well he did it and got a lot a free publicity, the local news, angry citizens, various groups. The publicity never turned into customers so he eventually changed the name.
Moral of the story is maybe a clever name is not that important.