I just replaced my runnung 1992 Jeep YJ 2.5L engine with a 1997 TJ 2.5L. Everything swapped OK and plugged right in however I used the sensors, ignition, distrib, injectors, and computer from the 1992 knowing they all worked.
I have now been messing with this thing for 4+ weeks and can not get it to run! I have checked the sensors, and tried 2 other '92 computers without it running on it's own.
Fuel & fire turn on, but just for a split second after the key is turned on, then both the fuel pump and the ignition shut down. We tried jumping wires and got the pump to run but no luck with fire.
Seems something is telling the computer to shut down and by doing so the auto shutdown relay and the fuel pump relay circuits turn off. Is the engine internal timing and valve opening different between a '92 and a '97 2.5L?
We have already removed all the hair on top of our heads and am almost ready to pull out all with the new fangled electronics and steal the 327 engine out of my neighbor's '66 chevy and put it in this YJ. I will GREATLY appreciate any assistance that would help get this Jeep running, ........ and save face with the neighbor.