Motor Mounts Question

[MOTORCITYSTANGS]

I get this vibration at 1500-1700 rpms and it smooths out untill 3000 rpm, if I rev it up in park or netraul , you can feel the vibration, I checked the harmonic balancer and the rubber is intact....I also checked the motor mounts and the were hard and chipping away...could bad motor mounts cause a vibration at a low rpm range

 

[89MustangGX]

I couldn't see the motor mounts in that pic, but bad mounts could cause more vibration and movement from the engine -- could be the tranny mount too. The tranny is easy to do, might want to do them all at once.

 

[90mustangGT]

When you get on or off the throttle, does the engine move around alot? If the mounts were bad, you would hear a clunk more then feel vibration. Your balancer might look good, but looks can be decieving. When the engine is rotating, does it wobble?

 

[HISSIN50]

also, might want to check timing (goin along the line of thinking that Jason is using) - if your timing light shows up somewhere rediculous on the outer ring, that suggests that it slipped....
Adam, i think he was waiting for Superman to read this - X-ray vision is needed to see the mounts. J/K

 

[66 Tiger]

I had the same symtoms in mine. Changed out the mounts & the motor felt like it was new again. ( swap was a PITA though )