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722.9 Auto Gearbox issue *Juddering*

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by allybassman, Oct 9, 2019.

  1. allybassman

    allybassman Member

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    Your Mercedes:
    2012 C350 Estate
    Hi All,

    Strange issue that my 2012 C Class (58k miles) has developed - Upon light load on the engine (keeping pace with traffic between 30-50 MPH I have started to feel the car judder. Accelarating is fine, the gearbox changes smoothly, doesn't hold onto gears too long and behaves normally.

    It's when I get up to speed and lightly release my foot off the accelarator to feather it to keep my speed to the desired level is when the issue happens. The gearbox drops into a higher gear to reduce the revs as normal and once it's done that, if I press the throttle, after a few seconds it starts to judder and you can see the rev counter bouncing by a few hundred revs up and down. It's really noticeable if i'm going down hill and I press the throttle pedal lightly.

    If I give it more throttle, the issue goes away, if the box changes down a gear the issue goes away too.

    I've only owned the car a year - from the service history I can see that the gearbox fluid + filter was changed in March 2015 @ 18k miles. I'm wondering if it's telling me it needs a gearbox service or there is something more drastic wrong!

    Thanks for reading
     
  2. Wighty

    Wighty Senior Member

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    Your Mercedes:
    W211/E320cdi/2009 and CLK200k 2009
    I think initially you could do with seeing if any fault codes have been logged . An ICarsoft code reader would do , or MB Star diagnostics at an Independent (probably better for in depth gearbox fault finding) .
    A gearbox oil and filter change may well help but that could cost £250 and may not be the fault .
     
    allybassman likes this.
  3. alexanderfoti

    alexanderfoti MBO Forum Supporter Authorised Forum Supporter

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    Your Mercedes:
    W221 S65 AMG - W204 C63 AMG + Various other MB's
    I agree, code check then gearbox oil service (filter and oil change) and see what happens. If the problem is still there, could be TC lockup solenoid or TC itself, they both give issues unfortunately.
     
    allybassman likes this.
  4. OP
    allybassman

    allybassman Member

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    Your Mercedes:
    2012 C350 Estate
    Thanks for the replies - I'm hoping it's not the TC but it well could be!

    This morning it behaved better - it's more noticeable when the car is cool and only done a few miles - again only under very specific circumstances of low load + high gear so the RPM is around the 1.1-1.3k rpm. After 30 minutes or so it's hard to recreate the issue. My googling is pointing towards TC valve? Either way I'll get it booked in to a local Mercedes Specialist.
     
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  5. Wighty

    Wighty Senior Member

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    Your Mercedes:
    W211/E320cdi/2009 and CLK200k 2009
    May well be fluid level ? When the oil warms up the volume expands and then becomes the correct fluid level .
    Let us know how you get on
     
  6. alexanderfoti

    alexanderfoti MBO Forum Supporter Authorised Forum Supporter

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    Your Mercedes:
    W221 S65 AMG - W204 C63 AMG + Various other MB's
    The TC can be turned off temporarily on the mb diagnostics tools, to rule out whether shifting characteristics are from the gearbox or TC.
     
  7. OP
    allybassman

    allybassman Member

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    Thanks chaps, i've booked it in with the receptionist as a gearbox issue rather than just a service. When I drop off i'll explain the issue and let them diagnose and advise rather than trying to be a know it all and telling them what to do haha!
     
    Wighty likes this.
  8. ajlsl600

    ajlsl600 Senior Member

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    Your Mercedes:
    clk3202001,sl6002003 with everything,A class 170cdi auto
    TC related . this car has trans cooler ? water getting in oil ? advise getting codes read first.
     
  9. OP
    allybassman

    allybassman Member

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    Just to add further symptoms / observations. Start of my journey it was easy to feel / produce the issue. Drove a few miles to Shell to fill up with my usual V-Power Derv. As soon as I left the forecourt a DPF regen started, the gearbox started behaving, due to gears being held and revs not going below 1.5k even when cruising. I took the long way home to let the DPF regen finish and as soon as it did and things were nice and hot the shifting quality felt better and even if I tried, I could not get it to judder.
     
  10. Gazwould

    Gazwould Senior Member

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    Your Mercedes:
    S204 OM651
    Hmmm , V Power derv , could you tell me the Cetane number improvement over standard ?
     
  11. OP
    allybassman

    allybassman Member

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    Christ no - not starting this old debate! Always used it (and the petrol) probably always will.
     
  12. Gazwould

    Gazwould Senior Member

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    S204 OM651
    Lol , fair enough , big con though as Cetane number isn't disclosed unlike petrol pump Octane .
     
  13. OP
    allybassman

    allybassman Member

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    I use it more for the additives to be honest - I used to have a MK1 Skoda Fabia VRS many moons ago that ran better on Standard Diesel + manually adding Cetane booster / cleaning additives products - After a while it became a bit of a faff, so I started using V-Power (sceptical at first) and found it ran just as well - so every Diesel and Petrol car since has used Shell V-Power. it's a shame they have changed the drivers club points system - but that is a whole new debate!
     
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  14. Gazwould

    Gazwould Senior Member

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    S204 OM651
    Started using 2 Stroke in the PD and it halved the smoke opacity test .

    Now use it along with 40ml of 2-EHN with the mixture easily added in used Redex bottles .
     
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