Regarding at 1992 Camry Wagon (4 cylinder).

At no time does the motor run hotter than ususal, but lately, if I stop someplace and turn off the motor, the engine will crank but not start.

I have to let the car sit, often with the hood open, for 30-60 minutes until the temp gague gets down near C before it will start and run again.

I figure some relay or sensor has gone bad, but I wonder if anyone has more expertise in this matter. I have no other problems in how the car runs. I just can't stop someplace and risk turning off the motor if I need to get back on the road within an hour.

I had a similar problem in my Taco. I changed out the spark plugs, plug wires and the battery (since it was time to do all of those things anyway) and the problem went away. If it's been over 30K miles since the last time the spark plugs were changed I would suggest doing so. I had over 120K on my plug wires and decided to change those out and had over 4 years on that battery.