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2010 E350 HIGH IDLE, NOT LETTING ME GO ABOVE 3000 RPM

Discussion in 'Introduce yourself' started by Quaver, Sep 11, 2017.

  1. Quaver

    Quaver Senior Member

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    W212 E350 2010
    Hi guys so I'm a newbie to Mercedes and glad to join the club but recently I have experienced my first issue in 9 months of having the car.

    So the first thing is that when starting the car it is idling at around 600 which is normal but as soon as I start driving it goes to 800 rpm and stays there.

    Next thing that has also happened is loss of power. When I am in manual mode it will not go above 3000 rpm and changes gear automatically.

    Then yesterday after driving for 30 mins on the motorway I noticed that the temperature was at 60 and stayed there when normal temperature is about 80.

    There is no lights on the dash and my Carly adapter isn't showing any faults.

    Any advice would be much appreciated
     
  2. LostKiwi

    LostKiwi Senior Member

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    Your Mercedes:
    '93 500SL-32, '01 W210 Estate E240, 02 R230 SL500, 04 Smart Roadster Coupe
    This sounds like a thermostat failure.
     
  3. Chrishazle

    Chrishazle Senior Member

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    Not going above 3k RPM happened just after I bought my C270 - also kickdown did not work. That was the MAF, changing it cured the problem. As for the engine temp, as LK says, I also had that on the C270 (also meant the heater took forever to give hot air in winter!), changing the thermostat cured that!
     
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  4. OP
    Quaver

    Quaver Senior Member

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    So I have driven the car earlier today and it seems to be fine running as normal. I think it might have something to do with it being cold early hours of today at 1am. Would this still be indicating that it's the thermostat and MAF?

    And can I rule out the DPF because I know this can sometimes be a issue with these symptoms too?
     
  5. Wighty

    Wighty Senior Member

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    Your Mercedes:
    W211/E320cdi/2009 and CLK200k 2009
    With a correctly operating thermostat the car will go to 85-90 on the guage and then stay there regardless .
     
  6. OP
    Quaver

    Quaver Senior Member

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    I will see what it's like later on but when I took it for a 30 min drive on the motorway it didn't go above 60 at all. Would I be correct in saying this would be a thermostat issue which is causing other related issues or seperate?
     
  7. malcolm210

    malcolm210 Senior Member

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    Yes it does sound like a thermostat issue, not unknown in the world of MB much more common than I've experienced with other brands. The engine management ecu will probably be maintaining a high rpm at tickover due to full operating temp not being reached
     
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  8. OP
    Quaver

    Quaver Senior Member

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    So I have contacted MB and they want 150£ for the themostat but there is also a Wahler one available on euro car parts for 50£. Is it worth getting the cheap 1 or go for original?
     
  9. Nick Wood

    Nick Wood Active Member

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    Get a Behr - one, those are the original thermostats without you paying MB money for it. Behr is German like the Benz is but for like 60% of the price.

    While you're at it, check all vacuum hoses for leaks and cracks, that will also cause the car going into the so called limp mode which prevents you to rev it above 3000rpm.
     
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  10. malcolm210

    malcolm210 Senior Member

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  11. OP
    Quaver

    Quaver Senior Member

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    ok great will have a look around. Does anyone know where the themostat is located in the engine and do I need to empty out the coolant first if so how much?
     
  12. turbopete

    turbopete Senior Member

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    Your Mercedes:
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    in the alloy housing at the other end of the radiator top hose. you will need to either drain the coolant or replace with fresh afterwards. personally I always used a thermostat change as a reason to refill with new coolant, and in the case of Mercedes thermostats, they both last about a similar timescale!!!
     
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  13. Nick Wood

    Nick Wood Active Member

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    Yes, absolutely right.

    Since the thermostat is at the top of the engine you will have a minimal spill of coolant, just fill her up again.

    Having said that, it's recommended to change the coolant every 2 years on modern engines. As far I understood you got no idea when it was done the last time so a change is never a bad thing to carry out while you're at it.
     
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  14. OP
    Quaver

    Quaver Senior Member

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    Thanks guys I will give it a go and let u know how it goes
     
  15. OP
    Quaver

    Quaver Senior Member

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    So the past few days the same thing has been happening but tonight the temperature went up to 80 which is normal and power was there for a few minutes until the engine management light came on so I plugged my Carly adapter in and it had come up with 2 faults but no explanation so I was hoping someone can tell from the codes. I am posting a picture for you guys to have a look. Thanks
     

    Attached Files:

  16. malcolm210

    malcolm210 Senior Member

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    Two options to progress either find a local independent with STAR so that a more accurate diagnosis can be made or replace the thermostat and go from there. I'd certainly replace the thermostat as the DPF regeneration procedure relies on knowing the engine temperature and in all probability won't regen at 60 degrees. Your blip this week may have been the faulty stat partially operating (closing)
     
  17. LostKiwi

    LostKiwi Senior Member

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    P2454 (assuming the reported code is correct) is DPF pressure sensor - as stated it has probably missed a regen and is now clogged. If you go to an MB specialist they may be able to force a regen to recover it but will certainly be able to get the correct diagnostic codes off as well.
     
  18. OP
    Quaver

    Quaver Senior Member

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    Right ok so I will just go ahead and do the thermostat when the part arrives. I just had a look at the thermostat fitted already and it's a Wahler 1, is this a original part MB use?
     
  19. Nick Wood

    Nick Wood Active Member

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    In general German cars use Febi, Behr or Bosch. This doesn't sound very original but I can be wrong.
     
  20. Naraic

    Naraic Moderator

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    Most MB do not have a true manual mode. So if you are in say 4th manually all that means is that you have dropped to 4th, the car will use lower gears as required automatically.
     

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