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Grandad Mode

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by Pg111, Dec 31, 2012.

  1. Pg111

    Pg111 New Member

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    Joined:
    Nov 18, 2012
    Location:
    Nottinghamshire
    Your Mercedes:
    C200 Cdi 2001 estate 'Mary Benz'
    Hi everyone,

    Do 2001 C220cdi have some kind of special ability to learn how you drive and in a way remap themselves to suit?

    Long and short of it is that this car I've been given keeps going into a sort of limp mode but its not limp mode. It drives great if I drive like a tw@ and thrash it everywhere but as soon as I get into traffic or follow someone and have to do a nice steady 30 it changes gear too early as in straight up the box still doing 25 and the throttle stops working beyond about 10%. It will still get to 80-90mph but just takes all day.

    First thing is like it thinks I want it to drive like I'm 90 and secondly it doesn't give any warning symbols on the dash or flag anything when I plug it into STAR.

    I've started thinking its a throttle position sensor but would this fault all the time or only after I've been taking it steady? Is there anyway of doing a DIY test on it with a multimeter?

    Also a little note. I've tried it with a new MAF and its still the same.

    Thanks! X
     
  2. brandwooddixon

    brandwooddixon Senior Member

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    Joined:
    Jul 31, 2006
    Location:
    Wolverhampton
    Your Mercedes:
    CL500 Bluefficency 2012
    Yes they do adapt to how you drive, but also check that the gearbox is in S mode rather than C or W (not sure whether yours has C or W).

    C (Comfort) or W (winter) will start off in 2nd gear and change up to a higher gear as soon as possible. S (Sport) starts off in 1st and will hold onto gears longer.

    There is a slight variation allowed for gearbox adaption to your driving style.
     
  3. television

    television Always remembered RIP

    Messages:
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    Joined:
    Mar 14, 2005
    Location:
    Daventry
    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    As you have replaced the MAF (not an Ebay version I hope) you will need to get the codes read out, any gearbox learning is very short as the gearbox only has a tiny memory
     
  4. Rappey69

    Rappey69 Senior Member

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    Joined:
    Dec 29, 2008
    Location:
    hants
    Your Mercedes:
    c220 w204 amg sport
    At 30 mph with warm engine it will just about slip into 4th...
    At 41 it will go into 5th, but only if very light on the throttle.. (well at least thats how mine works)
    If yours is changing much sooner even with throttle then suggest you follow televisions advice.
     
  5. alexanderfoti

    alexanderfoti MBO Forum Supporter Authorised Forum Supporter

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    Joined:
    Mar 25, 2010
    Location:
    Tonbridge
    Your Mercedes:
    W221 S65 AMG - W204 C63 AMG + Various other MB's
    It does sound like you are hitting a limp mode, possibly egr valve related, as mine did that when I used to drive slowly. I would get it plugged in to get the error codes read.
     
  6. lwbnick

    lwbnick Senior Member

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    Location:
    wales
    Your Mercedes:
    expedition
    Being a 12 year old 2 tonne automatic powered by a 2 litre diesel engine can't be helping things in the racing car dept.
     
  7. alexanderfoti

    alexanderfoti MBO Forum Supporter Authorised Forum Supporter

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    Joined:
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    Location:
    Tonbridge
    Your Mercedes:
    W221 S65 AMG - W204 C63 AMG + Various other MB's
    Just had a re-read, star wont show when its going into limp mode sometimes, just the error codes that come with it, and im sure there are error codes on your car. Get a list of the codes from star and let us know what they say.
     
  8. OP
    Pg111

    Pg111 New Member

    Messages:
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    Joined:
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    Location:
    Nottinghamshire
    Your Mercedes:
    C200 Cdi 2001 estate 'Mary Benz'
    I'll get it plugged in again but I made sure it was very thorough last time. Does anybody have any suggestions of places to take it around the Mansfield area?

    I cleaned the egr valve out because it was properly stuck with gunge. The MAF was a genuine mercedes one.

    Also might be worth a note that when my wife drives it she can get it to run fine for a lot longer than I can. If it goes wrong at all. She doesn't seem to drive it any different to me. It wouldn't bother me too much if it just got used round town cos up to 30 you don't notice but when u want to join the motorway and you can only get to 40 mph by the end of the slip road it's abit worrying.
     
  9. alexanderfoti

    alexanderfoti MBO Forum Supporter Authorised Forum Supporter

    Messages:
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    Joined:
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    Location:
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    Your Mercedes:
    W221 S65 AMG - W204 C63 AMG + Various other MB's
    Do you remeber what the codes where?

    If the EGR valve was completely stuck, its likely that the piping, intake manifold etc is filled with crud. If you get a repeated EGR low flow code or something similar, then look into the EGR shunt :)
     

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