I am jut finishing an engine swap from a 2.5l to a 4.0l and I have no spark or fuel.
my jeep is a 90 YJ 2.5l and the donar was a 94 yj with a 4.0l. Both standard. I swapped the engine, tranny, transfer case, rad, shroud etc.
I kept the main wiring hardness and the fuse box from the 2.5l but I took the EMU and the engine harness from the 4.0l (just plugged into the harness on the firewall.
replaced the distributer, rotor and pickup as well as crank sensor and still nothing. Turns over great.
I am sure it is something different in the wiring but I have no idea what.
Any help from someone who has done this before would be appreciated