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Physically, the answer is yes. the 1990 and the 1991 comanche, however have different engine management systems. the 90 is supposed to have had the Renix fuel injection system and the 91 switched to the Chrysler system. You would need to make sure the sensors on the engine were switched to match the vehicle. Also, any 4.0L HO from '91-up from the XJ, TJ, ZJ and even WJ vehicles should be a bolt in as long as you match the sensors. Later model engines are said to have stouter support ribbing on the blocks.

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Q: Will a 1990 jeep Comanche engine interchange with a 1991 Comanche?
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