The V6's Variable Cylinder Management (VCM) system runs on 3, 4, or 6 cylinders depending on load. The cylinder transitions create vibration that prematurely destroys the right rear motor mount — often by 80,000 miles — causing noticeable shake at idle. Enthusiasts install a "VCM Muzzler" device to disable VCM and extend mount life.
Idle the car in Drive with the brake pressed, hood up. Watch the engine — minor shake is normal; significant rocking or visible movement at the right rear mount means it's failing. A shop on a lift can confirm by checking mount integrity. Ask if a VCM Muzzler or similar has been installed.
Est. cost: $400-$700 right rear motor mount / $1,200+ all mounts
Source: Honda V6 VCM widely documented (drive accord forum, NHTSA)