What kind of car shakes when going over 40 mph?
What kind of car shakes when going over 40 mph? My Mazda 3 shakes bad when I'm driving on the fwy. Once going over 40mph, it shakes. Example: if I'm talking out loud while driving over 40, you can hear the shake in my voice. We've checked the tires, had them balanced. And it's still shaking. Why does my car shake at a constant speed? Sometimes the problem does not lie within the brakes or wheels; the engine causes it. If your car begins to shake while driving at a constant speed or jerking occurs during acceleration, the chances are...