Bumper to Bumper Radio, the car guys on KTAR, 92.3 FM in Phoenix, AZ, broadcast every Saturday from 11:00 am to noon. On this show, Dave Riccio of Tri-City Transmission in Tempe, AZ and Matt Allen of Virginia Auto Service in Phoenix, AZ talk about how we may be requesting auto services we don't really need. Also on this show:

• Does a tune up really make a difference?
• Don't rely on a quick over the phone quote. Take you car in to get an assessment.
• 1999 Ford F150: There's a whirring sound coming from the engine when I start my car. Is this a fan belt problem?
• 2008 Honda Tucson: I'm having a problem with my torque converter. Is there a shop on the west side that you recommend?
• 2002 Suburban: I had the o-ring on my oil pickup tube replaced but now two months later, there's fluctuation and rattling. Is the o-ring bad again?
• 2006 Toyota Tacoma 60,000: I was told that I have a problem with my pressure control solenoid problem. The repair shop told me this won't fix the problem and that I need an engine re-build. Is this normal?
• 2004 Honda Civic 240,000 miles: The car was overheating and we replaced the engine. The check engine light is still coming on and it's overheating again. Is this a bad engine or a radiator problem?
• 1998 Chevy Tahoe: When buying an older car, what should I be looking for to avoid repair problems?
• There's a leak in the transmission casing and it's shifting hard around 40 mph.
• 2007 Nissan Altima 4 cylinder: The dealer parts department wants to charge me $25 for one spark plug. Can I buy this at Auto Zone instead?
• 2003 Pontiac Grand Prix GT 155,000 miles: Is there a way to adjust the shift points in this transmission?
• 2011 Toyota Sequoia XLE 40,000 miles: When I turn the air condition on, there is a bad rattle and vibration on the passenger side. What is causing this?

Cars talked about on this show are 1999 Ford F150, 2008 Honda Tucson, 2002 Suburban, 2006 Toyota Tacoma, 2004 Honda Civic, 1998 Chevy Tahoe, 2007 Nissan Altima, 2003 Pontiac Grand Prix GT, 2011 Toyota Sequoia XLE