[JLMounce]

Originally Posted by Gary H

If I understand your symptoms right, the starter turns the engine over fine, but it won't crank up when hot. My bet is that you have a low voltage issue going to the Sniper system. In the condition you are describing, if the radiator fans are variable and on the high setting, they along with the starter draw, this could be dropping the voltage too low for the Sniper to run. I have run into this exact same scenario before where the engine fires fine when cold but has an issue starting when hot and the fans are on, especially if you're getting the Sniper voltage through the ignition switch or off the fuse box.

The sniper runs the fan in stall and crank?

I guess that would create a pretty easy test for the OP. When the engine is off and heat soaked, disable the fan in the ecu, then attempt to start.