I have been fighting this problem off and on for about 3 months now. Sometimes my 99 xj will crank but has no spark (always cranks, sometimes no spark), and I seem to have good fuel pressure. I have already tried changing my crankshaft position sensor, spark plug wires, throttle position sensor, and tested my ignition coil (tested good.) At this point I am running out of ideas and desperately need my jeep back!

Any input would be appreciated

 

how about the disputer and cap? and if your jeep sometimes crank and i would check the wire harness that runs along the back of the engine bay, i see a lot that the wires vibrate raw and bond together. the only thing that i could think of would be the computer. hope this helps

 

"seem to have good fuel pressure" Are you using a gauge or the force to determine that? Have you checked and know that it's not sparking or assume that it's not sparking because it doesn't start?

 

I havent put a gauge on the fuel pressure but it builds pressure again even if i let it out. I have tested the spark and there isnt one.