Gearhead-XJ90

Hello, as some of you already know my XJ was stolen not too long ago, and recovered with a burned engine compartment. I have a 1990 XJ Laredo 4x4 with the inline 6 cylinder RENIX engine.

I have most everything replaced now, but am stumped about the wiring harness. It's a complete loss, so repairing it is out of the question. I have found out the HO engines have the ECM located in the engine compartment, while my RENIX has the ECM under the dash next to the steering column.

I went to a local junkyard to find several XJ's (and even got my #703 injectors!) but ALL of them had different harnesses, even the RENIX models.

The 1989 was the closest match, but had a disconnect at the emissions label on the firewall, it has one less sensor on the engine block, and had a sensor on the thermostat housing (mine does not). It also has all gauges on the cluster same as mine.

I guess with the ECM from the 1989 model I could add the sensor on the T-stat housing and that would work, but could I use the HO harness and ECM, or are all the sensors incompatible?

Thanks in advance for any help.

cruiser54

89 should work. Someone has tampered with the one in the JY.

Gearhead-XJ90

I'm going to get the harness tomorrow and hope for the best. From what I can see the ECM is the same for the 89 and 90.

cruiser54

ECM interchanges 1987 to 1990 as long as you get one from a vehicle with teh same trans you have, auto or manual. 89 and 90 ECMs provide better throttle response and power.