How about this: Car Crazy
Or this: Car Craze
Hi Tom and Ray.
My suggestion is “Hope Springs Eternal (The Adventures of the Dubious Car Duo)”.
Remember Albany Street? Remember Shelley, the lady mechanic? How 'bout Jerome, who used to sleep in the shop on Landsdown Street? Remember my yellow Datsun that you declared a “piece of junk” from the first moment you saw it… and then you kept it running for 10 more glorious years?
Getting my car fixed (or not) has never been so much fun!
- Jan Williams
Lyme, NH 03768
“Fuzzy Dice”
With the Tappet Brothers!
Hey You’s Guys, I got a name you better not refuse, if you get my drift! You ready?
“Car Talk-Prime Time”
That’s it! Great Huh!
Love,
Vinny
Car Freaks, Animobiles
“Click, Clack, Zoom!”
(zoom as in camera, get it)!
Sorry I didn’t get through all the posts before I posted. I see fuzzy dice was already taken. 
So how about;
“Tune Ups and Torque Wrenchs” With the tappets!
“Manifold Mansion”
My suggestion:
Car Wags: For Hire
You could have all sorts of fun with this phrase - including signs posted in the cartoon! One phrase: Car Rags: For Hire Response: No, No, No - its’s Car Wags
With a brand as strong as Car Talk, why would you want to use anything else?
Joe
The most obvious in my opinion is “Don’t Drive Like My Brother!”
Hi guys,
I think a great name for the new show would be “Our Fair City”.
Best Regards,
Jim Pollock
When you do your prime time made for tv drama you could use " As the rachet turns"
To Whom It May Concern,
My suggestion for the title of PBS’s new animated series is:
“Car Talk’s Toon Up”
Thank you for your interest in this matter and I look forward to hearing from you.
Sincerely,
Jonathan R. Lichtenstein
How about “Clunk and Crunch”
CAR TALK FOR IMBECILES OR ARE WE THERE YET?
How about: “Car Talk-a-Lotta Bull” ?
Pete Bolz 
If These Tires Could Talk
If These Tools Could Talk
“P.S.I.” Cambridge
Car Yak Yak with Click and Clack