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Motor swap

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I put a 93 XJ 4.0 in a CJ7.  I pulled the engine wiring harness and the ECU to do the install.  On the CJ forums, there is a rule "Five Wires to Fire."  That means that just five wires from the "new" engine wiring will connect to the "old" wiring.  I don't know the number of wires for the Renix system.  You most likely would want just about everything from the 93 to install in your 87.

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