Bob 
2004 Toyota Camry Solara Coupe SE 2dr Coupe (2.4L 4cyl 5M)
Timing chain sprocket
 Great comfort, ride, fuel economy, eye catching styling. At 40,000 miles I took it to the dealer for an engine noise. There was no check engine light on.They changed the belt tensioner. The moment I drove away the same noise was still there. The next week they found the timing chain sprocket's teeth were worn. They changed it. Two weeks later the engine quit on me. The timing chain came off, bent the valves and dented the a piston and damaged the cam. They rebuilt all changed all these with the timing chain sprocket being the culprit again. They couldn't tell me why the sprocket teeth keep stripping and if it will happen again.This is the 2.4l 4cyl engine.