Vibration/Noise

DaveE320CDI

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Hi, My friends S320cdi has recently developed a noise /vibration driving in top gear that starts at about 55mph thru to 60 when driven on light throttle,then dissapears and is normal after that, also if accelerated hard then it drives perfect, it only happens when driven on light throttle, almost seems as though its labouring and should change gear sooner, have cleaned the maf sensor, any ideas much appreciated, are you out there Colin? cheers Dave
 

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If this car was made before 09 2003 then it sounds like the dreaded valeo fault with glycol in the gear box.

The way you have described the fault it fits perfectly,,humming or droning at light throttle when 1500 to 2500 RPM
 

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Did the S class have this fault Malc, dont recall one having this??

No it did not,,I was thinking 211 but it could be possible, it does fit exactly though other things could do it.

I think that the balancing is in to narrow a band to be that
 
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DaveE320CDI

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Hi Colin, and Malcolm, Yes colin you were spot on with the C Class was going to call you anyway to say thanks, wish you were nearer a few pints would be in order, malcolm this sounds bad news! will check make of radiator later i know its a 2003 model the face lift one but do not know what month, somebody said the other day that a temperory fix is changing the gearbox oil and filter cheers dave
 

Cole@MBS

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Quick check Dave, (dont always show) dip the oil, see what the colour is!

Glad the C,class was correct fault, not bad of the top of my head!!!

We will meet one day Dave, then i will have a pint with ya!!
 

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I know that this is not listed for this car,,but any rad can leak at some point it ilfe.

The exact words for this are.
Humming and droning,and or jolting during gentle acceleration at engine speeds of between 1200 and 2500 rpm

This fault can be produced at any time.

Changing the fluid will not help,, the damage if this is the torque converter clutch faces.

There are many other things that it could be,,a skilled engineer would know if it was the box.

MB charge £75 to test the fluid
 
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DaveE320CDI

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Colin, Have checked the oil level and its spot on, slight smell with it and a little dark maybe, thats about it dave
 
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DaveE320CDI

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To be honest i also thought about wheel balance! but would have thought that it would have shown on normal acceleration also not just when driven very slowly up through the speed range of 55-60ish
 

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Never dismiss it Dave, always a poss!!

After reading your first post tho, I'm thinking something other!!
 

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hi dave, is the symtom constant if driven at, eg 57.5mph, or is it associated with gear changes eg lock up clutch fault? if constant, could it be described as a whining/droning coming from the rear? if so could be differential, classic speed for that, also often worst on medium light throttle.
 

Number_Cruncher

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As the vibration is in a narrow band, this is a lightly damped resonance.

This is backed up by the comment that the range has to be driven through slowly.

Although a lightly damped resonance does eventually build to having a large amplitude, it takes longer for the vibration to build.

Usually, suspensions with their hefty dampers are well damped, and have resonances over a broader speed range; so, I don't think this is a wheel or hub problem.

I would begin by checking the propshaft and it's supports and bearings very carefully. I would check to make sure any spot welded balance weights are still in place. I would probably use a dial gauge to check the propshaft is actually running straight.

I would check to make sure the clutch and flywheel are secure, or flex plate if automatic. I would also check the crsankshaft pulley isn't delaminating.
 

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Thinking on this,,one could possibly rule the gear box out by locking the car in a lower gear, and this would take the engine out of the equation as well, and running the car up to the speed where the problem starts
 

Alex Crow

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Thinking on this,,one could possibly rule the gear box out by locking the car in a lower gear, and this would take the engine out of the equation as well, and running the car up to the speed where the problem starts

second that, good thinking.
 

craig amg211

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evening all i have experienced this problem.does it happen mostly between 1800 and 2000 revs,and seems to be middle to rear of car,diff area.in my case it was the glycol issue which malcom talks of.i flushed the gear oil fitted new filter used 14 litres in all,on advice from 5pares he knows his stuff. fitted new radiator and good as gold now
 

jibcl500

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Did the S class have this fault Malc, dont recall one having this??

Yes the W220 does have the same problem I have on in at the moment, new gearbox fitted but not a new torque vertor so the problem isnt fixed.

jib
 

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The glycol does not affect the box,,only the converter
 


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