PLEASE HELP - engine / transmission noise

si_wkd

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Nov 16, 2020
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Your Mercedes
W205 - C250
Hi All,


Please could someone kindly listen to this engine noise to help me work out where it’s coming from or what it is..


I have uploaded to YouTube:


Here is some background info:

- Mercedes C Class 250 - 64 plate. (W205)

65000 miles.


- issue only occurs high gear (5th) and low RPM 2k < (where tractoring would usually happen in manual gearboxes).


- usually happens when the automatic gearbox trips from 4th to 5th, and the RPM drops (on video the noise occurs when gear changes from 4th to 5th).


- only happens when pulling (I.e driving up hill, or accelerating, when taking foot off acceleration, noise goes away).


- doesn’t happen when in sports / sports plus mode due to higher RPM before gear change (noise only occurs low RPM 2k < and high gear 5 >)


- doesn’t happen when coasting.


- doesn’t happen when revving engine in neutral even to red line.


Finally, I noticed the noise a few weeks after taking for a massive service at my local Mercedes SPECIALIST garage (not dealership) where they performed a gearbox oil and filter change.


It’s the first service of this kind due to mileage and age.


I have spoke to garage on phone and they want me to take it back down on Friday to check their work, but they did said it was a routine gearbox oil change and they use a computer / software to conduct the oil change, plus genuine parts and oil used to preform the gearbox / transmission service.


I know they did use Mercedes oil and parts as I saw the delivery or parts when dropping off for service.


I don’t want to go in on Friday and accuse them of not doing the service correctly, but does anyone have any idea what could be causing the noise? Maybe not enough gear box oil, or a loose panel / part?


Just incase you can’t hear on the video... the noise is like a clicking / motor / vibrating noise. Only lasts a few seconds at a low RPM in high gear, goes away if manually dropping the gear back to 4th using flappy paddle or when the RPM increases.


Any help would be much appreciated.
 

mioba

Senior Member
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Feb 19, 2006
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Location
Nottingham and Köln
Your Mercedes
W124/E200, W220/S320CDI, W205/C200, W251/R350CDI 4Matic
Hard to hear anything awkward. I would leave it with the garage and simply explain what you observe and that you feel something is not right, no accusations needed.
 

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