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Old 04-16-2002, 03:07 PM   #1
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RPM at idle..???

At what RPM do your C's "rest" at idle...??

mine is resting at about 700-1000 recently
and i think thats a little too high...
want to have some feeback as to what others might be facing
taking it back to the dealer...

thanks guys


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Old 04-16-2002, 03:09 PM   #2
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700-900

Starts at 1100 then drops to an idle below 1000.
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Old 04-16-2002, 03:09 PM   #3
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700-800 about right
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Old 04-16-2002, 03:16 PM   #4
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My C320 idles at about 600 normally.
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Old 04-16-2002, 04:32 PM   #5
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C320 500rpm when warmed up.
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Old 04-16-2002, 04:43 PM   #6
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Do you think the supercharger has anything to do with the higher RPM idles?
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Old 04-16-2002, 05:15 PM   #7
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My previous vehicle-230C Kompressor idled at 700. Current car 320C Sport Wagon-between 700-800
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Old 04-16-2002, 05:19 PM   #8
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mine's a c320
i dont know about SC engines but i would think that it may have some effect...

however i have never noticed the high RPM before....
i started the car a few nights ago and heard for the first time that the engine was especially loud, as if it was revving...
and no my foot was not on the pedal
then i checked the RPM and saw that it was at about 1100...
i thought that was weird but continue to drive around...
when i reached a stop light i looked at the RPM again and it was
now at 800...

so is there something wrong... im gonna check again later today...

thank you all for the responses...

Calvin
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Old 04-16-2002, 05:48 PM   #9
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when cold out it idle's at around 1100 rpm when warmed up about 600 rpm...
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Old 04-16-2002, 07:47 PM   #10
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Quote:
Originally posted by mleskovar
C320 500rpm when warmed up.

My 240 also idles at 500 when fully warmed. I have never seen a car idle so low when warm.
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Old 04-16-2002, 08:44 PM   #11
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In general four cylinder engine is going to idle at a higher rpm than a six cylinder engine, so don't take those references as a sign of trouble.

As for what it should idle at, there are a lot of correct answers. Is it an auto? Is it warmed up? In drive? Neutral? A/C on?

I wouldn't be concerned with a 700-800 rpm idle on a warm, four cylinder car in drive, 1000 for a cold engine in neutral wouldn't concern me either... but doesn't the manual list this info somewhere?
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Old 04-17-2002, 10:24 AM   #12
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According to a local MBZ service manager at start up (cold) 900-1000 dropping to 7-800 when warm. Actually who cares as long as it doesnt remain permanently at high idle and doesnt idle so low warm that it stumbles on move off.
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Old 04-17-2002, 10:24 AM
 
 
 
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