2000 LS2 Won't start when it's hot

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

On Tue, 26 Jul 2005 13:29:26 +0100, in rec.autos.makers.saturn cugcsc
> wrote:

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