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Old 05-06-2003, 04:01 AM
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JimF JimF is offline
'94 S500: only 793 sold!
 
Join Date: Mar 2001
Location: San Diego, CA
Posts: 1,925
a2, the idle is supposed

to be around 500rpm at those temps (90F) and a fully warmed engine. Also your oil pressure is ok! Don't fix it, it ain't broke!

Mercedes Idle Speed vs Coolant Temperature

Temp (C) ---- Trans in Neut (rpm) ------ Trans in gear (rpm)
< 0 ------------- 800 - 900 --------------- 750 - 850
0 < 30 ---------- 700 - 800 --------------- 650 - 750
>30 <40 --------- 650 - 700 -------------- 550 - 650
> 40 ------------- 650 -------------------- 500

Just in case the '>' signs confuse anybody, "> 30 <40" means "greater than 30 degs C and less than 40 degs C".

As you can see, after the engine is at operating temperature your idle should be around >500 and < 650. My car idles at 626rpm.
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'94 S500 Cpe

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