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#1
05-04-2004, 08:01 PM
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Motor Mount?
On my 2001 C320, ill get in my car in the morning and start up my car, it idles at 1200 for about 20-30 seconds then slowly decreases the RPM,, When it gets to 700-800 RPM, there is the low frequency vibration in the car that is in some wierd way audible almost like a faint low bass sound you would get from a sound system.....
However after 10 minutes of it idling it goes away,, Does anyone know what this is, or how i can correct this??
__________________
2001 Mercedes-Benz C320 3.2 1991 Mercedes-Benz 300E 3.0 
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#3
05-06-2004, 10:18 AM
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hmmm,
My SL320 has an air pump that starts up right after you start the car when it is cold, I don't know if your newer car has that or not, it sounds like a vacuum cleaner. Does the sound occur when the radio is powered off? and why do you mention motor mount in your title? The decreasing idle after start up is normal. Good luck! Brian
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#4
05-06-2004, 10:24 AM
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The sound occurs when the radio is on or off, I know for a fact it has nothing to do with the audio system,, i was just using the audio system to give a comparison to the sound i was hearing.,, the reason why i mentioned the motor mount was because in my last mercedes, a similar problem occured and it was the motor mount. I understand that the idle decreasing is normal. I was just giving the forum a play by play of what and when things were happening.. I hear something start up when the car is started, maybe its the airpump,,, but the low frequency vibration is a whole other problem.
__________________
2001 Mercedes-Benz C320 3.2 1991 Mercedes-Benz 300E 3.0
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#7
05-06-2004, 12:02 PM
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Evan
Have you checked your exhaust system and expecially the the rubber hangers? You could be missing one or it could be torn. Can you determine what part of the car it is coming from? If you have bad motor mounts, often a trained eye can tell by the lack of space between the oil pan and the front suspension cross piece. On the old 190e I discovered that there was less than a inch. Once replaced the clearance has almost doubled. Haasman
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'03 E320 Wagon-Sold '95 E320 Wagon-Went to Ex '93 190E 2.6-Wrecked '91 300E-Went to Ex '65 911 Coupe (#302580)
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#8
05-06-2004, 02:28 PM
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if it is a motor-mount, what method would you use to slightly take the pressure off the mounts and listen for the sound to go away?
can you use a floor jack and a piece of wood to slightly lift the engine ( across sump? ) ?
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#9
05-07-2004, 01:12 AM
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Yes you can. Just be sure to only take the pressure off and not lift too much. A general rule is if you can put fingers in between the cross member and the bottom of the engine, the mounts are gone.
Haasman
__________________
'03 E320 Wagon-Sold '95 E320 Wagon-Went to Ex '93 190E 2.6-Wrecked '91 300E-Went to Ex '65 911 Coupe (#302580)
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