How about “This Old Car”.
“Foibles in the Fair City” “Cars Talk” “Carnundrums” “Driving Like My Brother” “Talking Tappets”
Right Back With Click and Clack
How about “Click & Clack’s Lousy TV Show” or “The Tappet Brothers Lousy TV Show”?
Apologies if I doubled up on anyone’s suggestions, too many to read at this point!
Good luck with the show guys!
Flipping Stations
Flippin’ Stations
Changing Stations
Harvard Squares
Dip Sticks
Warped Drums
The Shop
Grease Flunkies
Autonaughts
Autonauts
Autonuts
Check Engine
AutoMates
Automanic
Auto Motives
Car-Guy’d
You’re on the air with Click and Clack
Labor not included.
Family Guy
How about “Don’t Drive Like My Brother!”
Guys, I’m finding it tough to throw in the “Click and Clack” “Car Talk” thing in the title. That’s a true puzzler. Something like, “Not Running On All Cylinders”? You might preface it with “Click and Clack: Not Running On All Cylinders”, for name recognition, but with those caricatures and some funny promos, I don’t think you need it.
The Rod Father’s came to me as I was driving I-15 after listening to one of your shows
Cheers
Keep it Coming
How about “The Lug Nutts” or “Two Men and a Torque Wrench” or “The Grease Monkeys”
Here’s my idea: “Running on Empty”. That pretty much sums it up, don’t you think? 
Hope you like it. --Andy from Indiana
Call It Motor Mouths
I can’t see it being anything but… “Don’t Drive Like My Brother” !!!
This came to me while driving I-15 after listening to your show, how about The RodFathers.
Keep it Coming
Cheers
Clickety Clack, Yakety Yak
Airbags.
TWO ON THE FLOOR