Harmonic vibration through floor and seats

2003 TOYOTA AVALON
138,400 MILES • 3.6L • 6 CYL • FWD • AUTOMATIC
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JZAZZARETTI
  • MEMBER
  • 2 POSTS
We feel a vibration under acceleration from a stop or rolling acceleration. It nearly disappears when I lift off the gas pedal. The steering wheel does not vibrate or bounce.

Within the past year:
1 motor mount and 1 transmission mount replaced
Both rear rims made round again
CV boots checked
Tires balanced and rotated
4 wheel alignment

Great car but annoying vibration that feels like it's bouncing.
Jul 5, 2014 at 2:00 PM
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JACOBANDNICKOLAS
  • CERTIFIED EXPERT
  • 110,175 POSTS
Do you only feel this when the car is in motion? Have you checked tires to make sure there isn't a shifted belt or uneven tire wear? Do you feel the vibration in the steering wheel or the seat and floor?
Jul 5, 2014 at 6:32 PM
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JZAZZARETTI
  • MEMBER
  • 2 POSTS
the Vibration is felt ONLY through the floor and seat. tires are wearing evenly. ONLY feel The vibration DURING acceleration.
Jul 7, 2014 at 5:34 PM
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JACOBANDNICKOLAS
  • CERTIFIED EXPERT
  • 110,175 POSTS
If everything is good in the rear, the only think I can think of (other than an engine misfire) is a bad motor mount. And you said you replaced one. Have you checked them since the replacement?
Jul 7, 2014 at 7:51 PM