2001 S500 Idle Question - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 05-18-2009, 10:05 PM Thread Starter
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2001 S500 Idle Question

First Benz. Just bought 2001 S500 which had CEL on and rough idle. They replaced the MAF with new one and the CEL is now off but it still has a rough idle. Not terrible but not great. Two questions. Any idea on what is the cause of the rough idle is and second would the CEL codes still be in memory? The mechanic did disconnect the battery when he installed the new MAF erasing the codes???

Any help or suggestions are appreciated. Aloha
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post #2 of 3 (permalink) Old 05-20-2009, 05:04 PM
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Post I have a 01 C240

I am also having the rough idle problem, and also lack of power off the line. I havent come to an exact remedy but have been told to look at a few things:

Resistance in the coil pack/wires on the cylinder that is misfiring/idling rough.

Fuel Filter could be bad

Catalytic Converter could be plugged

Spark plugs need to be changed or a tune up.

If any of these works let me know so I can do the same. I will do the same

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post #3 of 3 (permalink) Old 05-20-2009, 07:13 PM
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I don't think disconnecting the battery will erase stored error codes. As I understand it, some can be cleared using commercially available OBDII scanners but others require the SDS system or something else pretty sophisticated like Carsoft.

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