Feb 12, 2010 · You can unbolt torque converter, push it back some and start engine and see if vibration changes. You can alos use a floor jack directly under the oilpan with a piece of thick rubber or stack of towels on it and slowly lift the engine while running. If the vibration quits or gets better, then there is an unforseen problem with one or both mounts. to predict maximum vibration amplitudes have been established that should prove beneficial to both users of explosives and the public. Nicholls, Johnson, and Duvall (4)2 recently reported results of the Bureau's 10-year program to evaluate-the problem of air and ground vibrations from blasting.
I have a vibration as well after the engine is warm and it’s under stress (accelerate or going uphill). New tires, balanced and aligned. New control arm and ball joint on driver’s side. Another balance and alignment. New spark plugs. New alternator. The codes I have is P0420 and P0430 bank 1 and 2.