I have a 2000 FIAT Siena 1.4el with the FIAT Lampredi Monoalbero engine, and the car is 22 years old now still with its original engine mounts.
The whole car, and also the steering wheel, both shake and vibrate a lot at idle, but then don’t shake anymore when I give the engine some gas and increase the rpms. I looked online and people say it’s due to bad motor mounts.
Why would bad motor mounts only shake the car when at idle, but not when at higher rpms? Shouldn't it vibrate even more at higher rpms? Why does it smoothen out when we increase the rpms?