This has happened to me at least four times now, always when wheeling at low speed, it dies and will not fire. Cranks but no start, has fuel pressure (although unknown how much), everything in jeep works but will not fire. Let it sit for a while with the hood up and it will start. Seems like something is getting hot and its killing it. I can drive at highway speed up passes and for hours in the summer with the A?C on with no issue, but when I slow down to a crawl or I'm actually stuck it will die! BTW its a '99 with an auto

 

Not Mod tech...

What is the exact number of the stored code and the fuel pressure in psi?

 

So used to posting and looking in Mod Tech because my jeep is mostly Mod....sorry I posted in wrong place, maybe a moderator can move? As far as codes, did not check, assumed with no check engine light there would be no codes, should know better, will check. Fuel pressure is an unknown, other than when it dies it runs perfectly, pulls 80mph up the pass with 35's, plenty of power. I have a gauge, and can check under normal circumstances, just never have it with me when it dies, it is currently in the jeep now for the next time it does!

 

Moved.

 

Need to determine whether you are losing fuel or spark (or both) when it won't start.
Ign coil and CPS are known to have temperature related failures, but they aren't the only possibilities.

 

It has no spark for sure(pulled wires while it was being turned over and checked), as far as fuel there is pressure at the rail (unknown but definitely pressure) but who knows if injectors are being told to fire.