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Q:

the sarter motor engages but does not turn the flywheel, starter just spins on 1993 Infiniti J30

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the starter motor just spins, does not engage the flywheel. The belts & pulleys only spins a little.
(1) Answer
check you'r stater to see if the starter is engaging the flywheeel. Sounds like there could a few teeth are missing from the starter or the flywheel. If you just purchased a new or used starter, check again to see if the starter is the right starter for you'r vehicle.