Date registered: Jan 2012
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1999 C280 rough idle
I have a 1999 C280 with rough idle issues.
It is most notable when I'm sitting at a traffic light in gear with the air conditioning on.
If I turn off the a/c the idle increases and the vibration stops.
With the a/c on the idle slows and the shaking begins.
If I take it out of gear, the vibration stops, even with the a/c on.
I have had this issue for a few months.
I recently installed new coils, spark plugs, spark plug wires, new valve over gaskets and breather hoses.
This did help, but it only reduced the intensity of the vibrations.
Prior to this I did replace the crank position sensor also.
I would appreciate any suggestions you may offer.