How do I know when my engine mounts need to be replaced?
Engine mounts on 2003 Chrysler PT Cruiser
You could carefully and safely jack the engine up and see if the mounts are separated. Usually faulty or broken mounts cause lots of vibration or clunking and if you're suspicious, get a flashlight an mirror and look at them. If they look damaged or tattered, then they probably are. In a bad case they separate and jacking up the engine or moving the engine (carefully) with a long prybar will reveal broken mounts.