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  #1  
Old 04-18-2010, 11:33 AM
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Low idle in gear

Hey guys,

When my E220C is in gear, the idle drops down quite a bit. Normally it idles a bit under the 10 mark (so, 850 or so rpm) but when in D or R it drops down.
Transmission was flushed, same problem.
I don't remember this always being like that. The rpms drop so low that even the oil pressure goes below 3 (if in P, it stays at 3).
People have told me this is normal, but I am 95% sure the car used to idle higher before, as I remember the oil pressure would NEVER budge from 3.

A pic of the tachometer in D:



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  #2  
Old 04-19-2010, 05:33 AM
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Bump
Anyone know?

It feels like the transmission or torque converter is maybe engaging too much at idle and is bringing the revs down via drag. Is this possible?
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  #3  
Old 04-19-2010, 06:52 AM
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That's completely normal behavior in my 2.6L 124. After all, putting the transmission in gear puts a load on the engine. You'd expect it to bring the rpm down a bit.
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Old 04-19-2010, 08:47 AM
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I am pretty certain this is not how it used to be.
The revs drop so low that the oil pressure goes lower than 3. I have never before seen the pressure below 3
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  #5  
Old 04-19-2010, 09:45 AM
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Spetz, your idle speed in gear is normal. Typically the oil pressure drops to between 1 and 2 bar when the engine is idling around 600rpm. Each bar is approximately 15psi so unless the oil pressure would drop to near 0 things are fine ... no reason to worry.
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  #6  
Old 04-19-2010, 09:45 AM
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My Idle RPM go from 850 to just over 500 when in gear. Oil pressure when hot can get as low as .5 bar. I was a little worried at first, untill I read the procedure for setting idle speed.
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  #7  
Old 04-19-2010, 09:58 AM
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I did notice that on hot days after a lot of driving my oil pressure dropped.
The lowest I have seen it is somewhere around 2.6 and I got really worried, but as soon as I put it into N it went back to 3.

Guys, maybe I am stubborn or something, but I am convinced this is not how it used to be.
Am I wrong? Do I just remember it differently?
Please keep in mind this car was owned since brand new and 16 years later I notice this??? Albeit, I was 11 when the car was bought.
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Old 04-19-2010, 02:07 PM
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Back to 3 bar in N??? That's something there, when HOT (80*C) mine idles around 850 in N with an oil pressure around 1.5. If you're shooting up to 3 there could be some blockage in an oil passage somewhere. Not trying to panick you, but it's indicative..in a V8 at least.
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  #9  
Old 04-19-2010, 02:30 PM
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It's been like that since brand new (always on 3)
And we have owned other E220, 210 E240, and been in other Mercs which have all been at roughly 3 when idling
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Old 04-19-2010, 02:32 PM
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Hmm... Ok.. I'm not too knowledgable about the newer ones, have had only exp with the older stuff.
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  #11  
Old 04-19-2010, 02:46 PM
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Same for W124.032 - 1995 E320

Oil pressure is in 3 range all the time, never going down.

Suspect is sending unit or stuck valve in the oil pump.
Idle is purrfect normal for hot weather
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  #12  
Old 04-23-2010, 04:16 PM
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This is normal.

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