Jeepcom23 Posted June 8, 2010 Share Posted June 8, 2010 I just picked a 97 ZJ for the engine to go in my MJ. Can I just swap out the engines and use my MJ's brains and electronics or do I need to swap all the ZJ stuff into my MJ? It's a 1997 4WD, Auto, 4.0. Thanks! -Cody Quote Link to comment Share on other sites More sharing options...
Eagle Posted June 8, 2010 Share Posted June 8, 2010 Your 91 is OBD-1, the '97 is OBD-II. Not sure, but I think you have to swap over the electronics with the engine. Or use the sensors and such from your eld engine on the new one. Quote Link to comment Share on other sites More sharing options...
Geonovast Posted June 8, 2010 Share Posted June 8, 2010 If you just swap the longblock, you should be fine. You're going to have to put your distributor into the 97 motor, however. I put a 91 XJ 4.0 into a 98 XJ, and only had to swap the dizzy. Motor works beautifully. Quote Link to comment Share on other sites More sharing options...
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