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Old 07-15-2002, 10:48 PM
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Join Date: Apr 2002
Location: boston
Posts: 119
w124 idle question

What are the proper idle speeds while the car is in P and in gear, given that the car is warm? The car is a 1994 E320, with the m104 engine.

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Old 07-15-2002, 11:58 PM
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Join Date: Jun 2001
Location: Houston, Texas
Posts: 838
The proper idle speed while in P or N is 650RPM's plus or minus 50, same with AC compressor engaged.

In D it is 550RPM +/- 50.


'91 300E, 215K miles

Last edited by pmizell; 07-16-2002 at 12:57 AM.
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Old 07-16-2002, 04:20 PM
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Join Date: Apr 2002
Location: boston
Posts: 119
Thanks for the quick reply. My car seems to be in that range with the a/c off, but seems to idle a little lower with the a/c on. Is my car normal? Or should the idle be the same with the a/c on and off??

Also with the a/c on with the car in park, sometimes it will jump up to 1000RPMs for a little then go back down. Normal?

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