So my car is running funny. I have unknown mileage on my 91' 318is. The motor is making a thumping that I can feel in the steering wheel, pedals, and kind of my seat. It is rpm dependent and only makes the noise when the car has warmed up. I know that it is not a rod bearing, so what do you guys think it is? I really need to get this fixed asap. And please give a why or what it would take/how to fix it. Thanks a lot.
Bill-B