How would I know if the motor mounts on my Crown Victoria are loose, because sometime after the car is running I'm hearing a strange vibrating noise coming from the engine?
If it's your motor mounts, the vibration won't stop.
You'll need to get under the car and take a look. The engine mounts are pretty easy to see - they'll have cracks through them. The Left one will be cracked and the right one will be squished. Use a pry bar and a flashlight and wedge between the Trans pan and the Cross-member while looking at the trans mount. Give the trans a lift and you can see the mount separate. We've been changing a lot of motor and trans mounts on our fleet of Crown Vic Police Interceptors. Not an unusual problem. Yes it will cause a vibration at Idle and yes, it can and will change as the Power train shifts position.
Search Ford Crown Victoria Questions
Ford Crown Victoria Experts
Related Models For Sale
Used Cars For Sale