W211 280CDi doesn't start

Discussion in 'Electronics' started by wombatwillis, Mar 21, 2014.

  1. wombatwillis

    wombatwillis New Member

    Messages:
    3
    Joined:
    Mar 21, 2014
    Car:
    W211 280CDi estate
    I have a W211 280CDi estate (March 2006). I unlock the car with remote key function as per usual. Central locking performs as expected. I put the key in ignition and the safety interlock unlocks (small familiar sound associated with this, I can then knock the Auto box out of Park with foot on foot brake). However in Park position as per usual when starting, when I turn the key to start the engine there is no response whatsoever. The starter motor does not turn. Nothing happens. I get the full dashboard lights as usual with key in start postion. I get no warning notices on dash. I have now removed the main rear battery which is 8 years old and measure 12.45V (no load). I didn't check the voltage before disconnecting, maybe I should do? I am currently charging it. It is taking charge from a reasonnable battery charger. Prior to removing the battery I did try a disconnect and reconnect, waiting about 2 mins before reconnecting. The was no change when attempting to start.
    The car has been garaged with no use for several months with the rear battery disconnected at negative terminal. Yesterday I reconnected the battery and successfully started the car. I did 3 short journeys each of a few miles for which the car started ok. The car failed to start after a 4th journey of about 3 miles.
    Could anyone offer any advise as to what the problem is likely to be?
     
  2. E270 Owner

    E270 Owner Hardcore MB Enthusiast

    Messages:
    1,672
    Joined:
    Dec 23, 2012
    Location:
    S E London
    Car:
    Anything I get my hands on.
    It could be the 3 short trips were not enough to fully recharge the low battery condition.

    Re charge and take for a longer run it should be ok.
     
  3. OP
    OP
    wombatwillis

    wombatwillis New Member

    Messages:
    3
    Joined:
    Mar 21, 2014
    Car:
    W211 280CDi estate
    Charged for about 4 hours now and charger showing fully charged. So I assume battery is relatively healthy as it is taking charge. 5 mins after disconnecting the charger the (open circuit) voltage is showing 13.44V but this will slowly drop and stabilise. I will check the voltage in the morning before putting back in the car.
     
  4. OP
    OP
    wombatwillis

    wombatwillis New Member

    Messages:
    3
    Joined:
    Mar 21, 2014
    Car:
    W211 280CDi estate
    Battery stabilises at 12.7V. Battery charger when reconnected this morning immediately shows fully charged so no loss of charge overnight.
    I am assuming battery is good. So I installed battery back in car. Everything works as before, lights, ignition unlocks, power tailgate works, obviously central locking, Command Sytem, Fan, Electric Windows. BUT still cannot start! The igntion unlocks and so I can knock the autobox out of Park position with foot on footbrake.
    I assume some kind of relay problem? Anybody have any ideas or met similar issue with no repsonse from car when turning key to start position?
     
  5. mersum1es

    mersum1es Hardcore MB Enthusiast

    Messages:
    1,056
    Joined:
    Aug 9, 2012
    Location:
    Finland
    Car:
    W220, W210
    Starter motor fail? Try knocking the starter motor by long shaft while trying to start, sometimes it helps... Very ofter starter motors fails immediately without warnings. Try to check that all wires all still connected to starter.
     
  6. SimonsMerc

    SimonsMerc Hardcore MB Enthusiast

    Messages:
    1,143
    Joined:
    Oct 3, 2004
    Location:
    Sudbury, West London
    Car:
    Mercedes S212 E350 CDI BlueEfficiency Sport 256bhp, VW Passat B6, Suzuki GSX-650F, Suzuki DRZ-400SM
    12.7v stable means your battery is still good (after 8 years it's pretty amazing actually). Does sound like it's either the starter motor or the electrics getting to it.
     
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