Rough idle
10-19-2014, 08:14 AM
#1
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2005 E320
Rough idle
2005 e320 with a rough idle when it is warm. No check engine light and drives. fine. Starts with no problem and doesn't stall out. The only thing I noticed the headlights dim on and off with the rough idle.
10-19-2014, 05:42 PM
#2
MBWorld Fanatic!
Could be a bad ignition coil or spark plug causing the roughness on idle, usually it takes a little while for these parts to fail completely throwing a check engine light.
