I have a 95 Camry LE (v6) and I'm in the process of replacing the water pump. One of the prerequisites for accessing the pump is crank pulley removal. User cdunn (thanks a bunch for the suggestions) provided me with info on the starter bump method for crank bolt removal (since I don't have an impact gun) and managed to fail at every attempt. When filming myself doing this, I would turn over the engine with the camera facing the crank bolt. I noticed that when the socket was on the bolt (and socket attached to breaker bar which is snug against my control arm) and I bump the starter, the crank doesnt make a full revolution...it seems to either get stuck - like theres not enough torque - or it senses something blocking it and doesnt turn. After removing the socket, and bumping the starter with nothing on the bolt, the crankshaft turns fine...help!
This is compression of air working against you
Over the course of two crank revolutions for your Camry you have 4 cylinders compressing air and fuel. When you see the engine get to a point of rotation and it rotates backward a bit after releasing the starter, that's air acting as a spring and resisting.
If you take your sparkplugs out of the engine it will allow the engine to turn over without working against your efforts.
This is normal behavior, nothing's wrong.