Question about 1993 Jeep Grand Cherokee

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I put a 1997 model motor in a 1993 jeep grand cherokee, now it turns over great it just takes forever to start what could be causing this

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  • john_ed Sep 12, 2009

    sure didn't,don't know what an ECU or a OBD is

  • matthew kuhl May 11, 2010

    Did you replace the ECU and add any OBD instruments for the new motor which were not in the old harness? There could be different components between the two engines and if the computer isn't getting all the info it needs, it won't run so great.

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