S-Class (W140) 1991-1999: 300 SD, S 350TD, 300 SE 2.8, S280, 300 SE 3.2, 300 SEL 3.2, S320, S320L, 400 SE, S420, 400 SEL, S420L, 500 SE, S500, 500 SEL, S500L, 600 SE, S600, 600 SEL, S600L, 500 SEC, 600 SEC

rough idle and codes

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Old 09-21-2007, 07:47 PM
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rough idle and codes

Hey guys,

I've done a search on this topic, and everyone is saying to pull the code. Unfortunately, i dont know how? I have a 92 600SEL with 77,000KMS. Last time at mercedes, they told me i MAY have a wiring issue, but they weren't sure without checking so we didn't address it, since nothing major was wrong with it.

So last month, my ASR light went on with limp home mode, and after bringing back to the dealer and re-doing something with the computer, the problem was gone.

Today, being rainy out, and stuck in traffic, the car was running fine. Then while i was sitting in traffic, the rpm at idle dropped to 500-600rpm. The car started sounding alot rougher and louder even when i wasn't moving. As i start accerlerating, the car is NOT smooth between idle - around 2000rpm. It rattles and it is rough. After that, when idling, the rpm meter starts bouncing, and now i can smell a little "burnt" smell to the car.

My father keeps saying that there's not enough water in the coolant. So if i were to add more distilled water into it, WHERE is the coolant located? (seems like a dumb question)

Also, from the search, everyone told me to pull the codes to see what is wrong with the car. How do i pull the codes?

Please help, since I am not very mechanically inclined, and some of the problems i searched for seemed very bad. =(

Thanks!
Old 09-22-2007, 09:02 PM
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alot of problem with the Idling Control Units in these models, dont forget the check all maintenence stuffs !

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