2000 LS2 Won't start when it's hot

I recently have been have problems with my car starting. It will star
when the car is cold but after drive for awhile it will not start afte
i turn it off. I'm not sure what the problem is but my service engin
soon light comes on. The next moring when the car starts the servic
light is not on. I have tried high octane gas and fuel system cleane
but nothing seem to work. After the car sits for a couple of hours i
will start. Has anyone ever had problems and have any suggestion on ho
to fix it. The engine will turn over but it will not start. I have foun
that if i open the hood the engine cool down faster. Please help!!

 

Coolant temperature sensor. It screws into the engine block below the EGR valve.
About an $8 part at AutoZone. Don't forget antisieze compound or Teflon tape on
the threads when installing. Same thing happened on my 95 SW2 back in November.

 

About 5 years ago I had exactly the same symptoms with a Chevy Cavalier. It
turned out to be a thermal problem with the electronic control module that
sits in the distributor. When it got hot, the module failed to produce a
spark for ignition. When it cooled down the circuits recovered.
I believe that the Saturn and Cavalier used common components at that time
..

 

May I add a sort-of similar head-scratching problem to post? Could be useful reference.

Had an older oldsmobile years ago, that would stall at intersections or any place where it would idle on hot days. After much effort, the diagnosis was the fuel lines traveled directly above the exhaust manifold and were aged ( meaning corroded away ) and thin material left. The lines would succumb to heat and vapor-lock the fuel. Funny fix -- since this was a very old car, I used a hole saw to add a window right above lines, then put an aluminum dryer vent as an air-scoop in the hole and pop-riveted it to the hood. Worked like a charm letting the heat out. No more stalling. Not to mention the curiosity factor to by-passers was priceless. Non figured out it was a dryer vent and tried to look under hood to see what was going on. At this point I added performance stickers all over car to confuse the issue even more, and was challenged daily for racing from kids with street cars.