car runs rough on 2003 Mercedes-Benz E320

I have a 2003 E320 which has started to run rough, sounds like a diesel, with moderate vibration. Just had the oil changed by MB dealer but no change in running condition. What should I check? The dealer changed the oil "only". I did not have a check engine warning.

by in Alexandria, VA on October 31, 2009
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2 answers 1 comment
ANSWER by , October 31, 2009
Did the dealer make any comment about the way the car ran? If the Check Engine Light is on a code is stored in the on board computer in your car. A scan tool is required that attaches to a 16 pin diagnostic socket under the dash of your car that reads problem captured by the on board computer. If a Check Engine Light is on I suspect an ignition problem or fuel injector problem but I more suspect your car has an exhaust leak from a gasket, cracked manifold or exhaust pipe/muffler.
COMMENT by , October 31, 2009
have a 2003 E320 which has started to run rough, sounds like a diesel, with moderate vibration. Just had the oil changed by MB dealer but no change in running condition. What should I check? The dealer changed the oil "only". I did not have a check engine warning.
ANSWER by , December 06, 2010
Have the engine mounts checked. Bad mounts will make the car seems like it has a rough idle, but is actually the vibration on the engine.