I had a 1992 Camry, with only 83,000 miles on it. It needed some repairs, and I'd just put on new tires, but the deciding factor was that the air conditioning didn't work in addition to the other problems. Air conditioning is expensive to fix and fixing it is an opportunity to screw something else up, so we sold the car, got a 2000 Ford Escort, and are happy with it. The gas mileage is better too.

I think you've put enough money into your Camry already, especially considering that it's not that old. Also, it is pretty easy to sell a Camry due to the ingrained notions people tend to have about them. Really, the notions override what they see in front of them.

We don't do car payments either :)