I'm the question guy. Ohh! Ohh! Ohh! (five-string waves his arm wildly in the air from the back of the classroom)
I'll post some of my questions here for other's benefit...
1. Are you running the stock xj fuel pump? I have discovered the '96 is unique because it it the only year pump to have a built-in regulator right on the pump so no return line is needed from the fuel rail.
2. Are you running one or two O2 sensors? If just one, do you have to do anything to trick the ECM into thinking there is a second one downstream present?
FYI, I am working on a '90 Yj that I have installed a 4.0 HO head on, (ported, polished, otherwise stock everything) and am in the process of getting the wiring, MPFI, ECM, etc all hooked up. The donor was a '90 XJ that had a '96 motor installed by PO. OBDII system. The XJ ran well before I pulled the motor. That alone tells me the OBDII system can be made to work in older vehicles, unlike many posts I have read saying the OBDII system is too difficult to work with.
Boycott shampoo! Demand the REAL poo!
White Jeep Club #119