Diagnostic Aids
WARNING: This page is about a different car, the 2002 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
The accessory drive components may have an affect on engine vibration. An overcharged A/C system, a power steering system restriction, or incorrect fluid, or an extra load placed on the generator are some systems that should be inspected. To help identify an intermittent or an improper condition, vary the loads on the accessory drive components.