W212:E350 2010 model, odd noise/vibration at certain speeds

[anyweb]

hi,
lately i've noticed an odd noise coming from my car (not sure if it's from the engine, drivetrain, or exhaust, it's hard to pinpoint), when accelerating but never when hard accelerating, so it only occurs some times, and for a few seconds and then it's gone,

for example, if i'm on the motorway and I accelerate from say 85km/h to 110, between 90 and 95km/h the noise will come, the noise sounds almost similar to that noise/vibration you hear when you drive over cobblestones, but not quite as loud, it seems to occur mostly in two places, i.e. approx somewhere between 40>70 km/h and 90>110 km/h

any body else had a similar issue or know what might be causing this ? i'm still paying off last years Turbo failure so i'm really hoping this is not another expensive problem manifesting itself...

thanks in advance for any good advice
cheers
niall

 

[JohnnySBC]

Hi... strange problem you have, maybe something from the tyres ? i myself have a noise but i know certainly is from drive shaft rubber bearing ...

 

[Wighty]

Have you checked exhaust brackets and the underbody plastic engine covers ?

 

[bembo449]

reads like possible CV joint issue , had it on a few cars before but its going to be hard to pin point pal , like most noises of this ilk

 

[anyweb]

Hi... strange problem you have, maybe something from the tyres ? i myself have a noise but i know certainly is from drive shaft rubber bearing ...

i've changed wheels and tires and the problem persists so i'm very confident it's nothing to do with them

 

[anyweb]

Have you checked exhaust brackets and the underbody plastic engine covers ?

havn't checked anything yet, just looking for some advice and ideas before i do

 

[Wighty]

Get a rubber hammer and bash things to see if they are loose

 

[star]

Torque converter judder??

 

[anyweb]

if it is the Torque converter juddering, how would I prove it ?

 

[star]

Knowledge, feel and on certain tcu's you can switch it of temporarily to test.

 

[Steve@Avantgarde]

Doing loads of engine mounts and subframe bushes on the 212s at the moment for vibrations..

Without looking at it/driving it, it is impossible to tell you.

 

[Arudge]

Could be engine mounts. When they collapse an internal bolt starts knocking on another internal component. I'm told engine mounts have a service life of 100,000 miles.

To test. With the bonnet up, foot firmly on the brake, rev the engine to 2000 rpm in drive. Watch to see if the engine lifts, some movement is acceptable but not much.

See if you can post a video of it.

 

[anyweb]

thanks for all the ideas and advice folks, i'll try that test with the engine on the weekend when it's light

 

[anyweb]

also my car has done 238,000 kilometers which is approx 147886 miles so i guess it could be them...