2003 Mercedes-Benz E320 Q&A

2003 Mercedes-Benz E320 Question: car runs rough

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. -
Answer 1
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 1
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 2
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. -
Related Items:
tis is a wagon that has had most everything replaced and checked. No book came with the car has...
The car lost power all of a sudden, while driving down the freeway. The car starts easily but runs rough at idle. I can go 0 to 60mph in about 20sec. The check engine light is on. The engine runs s...
Had oil changed made noise prior to that. knocking/ tapping noise at idle as well as off idle Car also runs rough and vibrates while driving at all speeds . Someone had put aftermarket lights in ca...
The crankshaft position sensor may fail. Symptoms of this are: The engine will crank—but not start—especially when the engine is warm. The car may start again if it is left to cool ...