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Question: Challening Alero Problem

Hello. I really need someone's help. I myself have worked on cars for many years, this one my wife's car, an olds alero 2002, 2.2 Ecotec Engine.

It's been having issues with passlock of course so I replaced the lock cylinder and the ignition switch. Car has been running fine

2 days ago my wife was driving and the car just quit while diriving. When I arrived at the scene I tried to start it and it just made a starter spinning noise, like it's no engaging the flywheel or something.

I bought a new starter and tried it, did the same thing - have replaced the battery, does the same thing. I looked at the flywheel from the starter hole and it doesn't look eaten up, I was able to turn it very easily with a scredriver alittle bit which concerns me, it was alittle too easy to turn in my opinion.

So the starter engages and makes a spinning sound like it's just spinning. Could this be a flywheel problem? It's very confusing because something caused the engine to quit.

I thought maybe the BCM but I don't think the BCM would be at fault here since there is current going to the starter obviously. I even had it out and watched the bendix come out and the starter turn of course putting in a new one illiminated

any ideas? engine seize? flywheel just spinning freely? cracked?