Hello, would any of you be so kind and direct me to an article that might help me in solving an erratic idle I am having with my 300E W124? Whether cold or warm, it idles between 500 and 700 (up and down) but the engine does not stop. However, since I am in the process of replacing the AC Compressor, I am not sure if the extra force required to run the ac, will make it stop. Any help?

Do a search - there are a lot of possible causes of this particular symptom, and what you find will help identify further symptoms which will narrow the seach to just a few possible culprits.

Steve

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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7

Consider what M.B.DOC had to say in this thread.

http://www.peachparts.com/shopforum/showthread.php?t=44853&highlight=fluctuating+idle

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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"