If you suspect the engine could be locked, place a socket on the crankshaft pulley center bolt and use a breaker bar, see if you can turn the engine by hand.
In most cases, if the engine is locked, you will get one click from the starter and nothing more. That is because the starter engages but can't turn the engine.
Have you removed the starter and inspected the flex plate to make sure there are no damaged teeth or evidence of the starter drive gear hitting it?
Let me know. Also, I hope you have a good Thanksgiving.
Take care,
Joe
Wednesday, November 23rd, 2022 AT 7:42 PM