Rough idle - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 07-09-2011, 11:32 PM Thread Starter
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Date registered: Jul 2011
Vehicle: 1997 E300 Turbo Diesel
Location: Australia
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Question Rough idle

Hello All. I am a new member. I have a 1997 E300 W210 Turbo diesel. This is a comfortable car that really 'holds' onto the road. It is also very fuel efficient, delivering approximately 12kms/litre at the cruising speed of 110 km/h. It is a very good car to drive.

Recently I have noticed that the car is idling roughly when the motor is warm. It idles smoothly when the motor is cold, and also idles smoothly when in gear but with the brake pedal applied. So if I am idling at stop lights, it idles roughly, but if I put the car in gear and apply the foot brake to stop forward or reverse motion, it idles smoothly.

The problem was originally identified as a faulty EGR valve. This valve was replaced with a new valve, but the rough idle remained. This was not a good outcome, as the EGR valve was expensive and time consuming to replace.

I have cleaned the MAF sensor, but this has not altered the problem. I have read in this forum that faulty Oxygen sensor(s) may cause the problem, but I cannot find these.

Is there someone who has any ideas about how this problem may be fixed?
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post #2 of 2 (permalink) Old 07-10-2011, 07:37 AM
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