What causes engine vibration?

Answer

There are several different vehicle components that cause engines to shake, shudder or vibrate. CarsDirect.com lists worn or faulty spark plugs as the most common cause of engine vibration. Bad spark plugs cause an engine to misfire or not fire at all on some or all cylinders. This throws the engine out of balance, resulting in vibration.

Loose or disconnected vacuum hoses, an improperly adjusted or poorly working fuel intake system and loose timing belts are a few of the more easily remedied causes of engine vibration. Solving vacuum issues is often as simple as replacing or reconnecting hoses, and loose timing belts are fixed through a timing belt change where the belt, idlers and tensioner are replaced to ensure a tight fit. CarsDirect.com recommends cleaning the fuel intake, throttle body or the carburetor, as well as readjusting components to manufacturer specifications to eliminate vibration caused by the fuel intake system.

Damaged or broken motor mounts are arguably the most serious cause of engine vibration. CarsDirect.com suggests that a driver shift between drive and neutral while the vehicle is sitting still. If the vibration lessens while in neutral, the motor mounts may have sustained damage. Changing old motor mounts requires lifting the engine to access the mounts, a repair with high labor costs.

Reference:
Q&A Related to "What causes engine vibration?"
Start your engine and let it idle normally. After the first few minutes of start-up, listen and feel for any vibration in the vehicle. A sound like a buzz or rattling during cold
http://www.ehow.com/list_7223257_causes-vibration-...
Vibration is caused by movement and motion. Vibration, such as on a vehicle, is caused by the force of the vehicle coming in contact with a solid surface, the road, and uneven wear
http://www.ask.com/web-answers/Science/Physics/wha...
Sharp power pulses.
http://wiki.answers.com/Q/What_causes_vibration_in...
the expidition in general had a ton of problems And that year and others were well known for blowing spark plugs out of the engine . . There are so many sensors on that car you need
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