ESC or Motor broken?

[Onyx]

Hello everyone, I have been trying to fix my quad for a week but can't find the problem, when I spin up the motor 3 very quickly then stop it then re spin it, it makes a very weird noise and gets kinda of "stuck" a a certain speed, it looks like it's burning because it smells burnt, first time it does this in months and I always cleaned the motor so I think it's the escape and not the motor? I have already synced the esc's a dozens of times and it doesn't change anything...

Here is a video that demonstrate the problem:

 

[RENOV8R]

Simply trade your #3 ESC signal wire with any other signal wire, lets say #2. If the problem transfers to the #2 motor, you know it's the ESC. If it doesn't, you know it's #3 motor.

 

[DavidKersting]

Well said. I used the same method on my similar drone issue.

 

[jswander]

Take your props off or buy more band-aids. That said, I had bad motor (something bent) and managed to burn out my 4in1 during troubleshooting. Sounded a lot like yours. Having the prop off helped me see the wobble in the shaft (I think) or maybe I was more willing to move my eye closer.