Warm Start Issues, Help!

[mapguy]

My 1999 Boxster has started a weird behavior. When the car is warmed up, gage at 180, and I shut it down it will start no problem. If I wait for about a hour or so, allowing the temp gage to show about 150 or less, it will crank but not start. I must wait for it to cool to about 100 to get it to start. Here are the things I've done.
1) MY Duramatic is returning a 1324 code. (camshaft position) so I replaced the cam position sensor.
2) I've performed the electrical tests(from my Bentley) on the Relays in the trunk, checked all fuses etc.
3) I by- passed the relay for the fuel pump and the pump works fine.
4) I've checked for vaccum leaks.
5) I've replaced plugs and coils.
6) I took the MAF off and it didn't make any difference.
7) I cleaned the TB.
How do I check the crankshaft sensor? Could this be the problem?

Any help will be greatly appreciated.

Thanks in advance

Mapguy