Clunking at 1500-2000
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Newbie
Joined: Sep 2022
Posts: 2
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Mercedes-Benz S204 C350Cdi
Clunking at 1500-2000
I have an OM642 engined 2009 C350cdi T-Modell (220bhp, rebadged 320). 115k miles, full service.
Its developed a clunking noise from the engine on low throttle acceleration through 1500-2000rpm only.
Been to my MB specialist who found no error messages.
There are slight hesitations in the rev range but once past 2k rpm normal power, this is not a limp-home issue. EGR recently replaced to no improvement (the clunking predates this). no issues with DPF regen. All soft hoses checked and confimed intact.
Currently having to shift either side of the rev ranges (or just cane it everywhere!) but if I am trying to be gentle, around town for example it is a pain in the backside.
Any ideas?
Its developed a clunking noise from the engine on low throttle acceleration through 1500-2000rpm only.
Been to my MB specialist who found no error messages.
There are slight hesitations in the rev range but once past 2k rpm normal power, this is not a limp-home issue. EGR recently replaced to no improvement (the clunking predates this). no issues with DPF regen. All soft hoses checked and confimed intact.
Currently having to shift either side of the rev ranges (or just cane it everywhere!) but if I am trying to be gentle, around town for example it is a pain in the backside.
Any ideas?
Member
Joined: Jan 2022
Posts: 104
Likes: 6
W204 2013 C250 Coupe
Hello!
does it sound like the videos in these two posts?
Ive been experiencing something similar but not exactly a clunking noise - ive attached my videos here https://mbworld.org/forums/c-class-w...w204-c250.html
and there is another post that sounds exactly like mine
https://mbworld.org/forums/c-class-w...e-problem.html
Hope this helps
does it sound like the videos in these two posts?
Ive been experiencing something similar but not exactly a clunking noise - ive attached my videos here https://mbworld.org/forums/c-class-w...w204-c250.html
and there is another post that sounds exactly like mine
https://mbworld.org/forums/c-class-w...e-problem.html
Hope this helps
Thread Starter
Newbie
Joined: Sep 2022
Posts: 2
Likes: 0
Mercedes-Benz S204 C350Cdi
Hello!
does it sound like the videos in these two posts?
Ive been experiencing something similar but not exactly a clunking noise - ive attached my videos here https://mbworld.org/forums/c-class-w...w204-c250.html
and there is another post that sounds exactly like mine
https://mbworld.org/forums/c-class-w...e-problem.html
Hope this helps
does it sound like the videos in these two posts?
Ive been experiencing something similar but not exactly a clunking noise - ive attached my videos here https://mbworld.org/forums/c-class-w...w204-c250.html
and there is another post that sounds exactly like mine
https://mbworld.org/forums/c-class-w...e-problem.html
Hope this helps
Things I can also rule out,
I have a tuning box running up to 35bhp extra, it happens whether attached or not with no change in frequency or severity. I have K&N panel filters, returned them to standard, no change (although the clunks do sound a bit more muffled). I disabled the Swirl valves actuator using a resistor, no difference, although pick-up is improved so it goes through the 1500-2000rpm segment a bit quicker!
