Puzzled everyone so far....

Discussion in 'Engine' started by curlyearly, Sep 18, 2011.

  1. curlyearly

    curlyearly Member

    Messages:
    55
    Joined:
    May 28, 2008
    Location:
    Stoke-on-Trent
    Car:
    ML320
    Hi all

    I have an annoying on-going issue with my 2003 ML320 petrol. 50K miles. FSH. Cossetted.

    Symptons:

    Cold starting. Starts on the button (key) but when pulling off loses 50% power. If I let warm up for two minutes it runs perfectly.
    Warm starting. Sometimes cuts out totally needing 1/2/3 restarts. Can be hesitant for first 50 yards.

    In both cases, within 200 yards OK for rest of journey, be it long or short.

    Whats been done:

    Has been two three garages; firstly my local, then a specialist MB alternative garage staffed by ex MB employess and finally MB dealership.

    Each outlet voices the same opinions, mostly based on a computer but also their expereince. I kid you not when I say I have had the following items changes three times ...

    Plugs - they all have their own chosen "one"
    Leads - see above
    Coils - running out of ideas
    Lamda sensor - see above
    TDC sensor - see above.

    There is some considerable cost to these items. I've had enough. The fault is there 50% of the time. It was there when I visited the garagtes in question. I have no problems with these garages I just want the car engine resolved.

    Ideas please.
     
  2. markjay

    markjay MB Club Veteran

    Messages:
    24,906
    Joined:
    Jun 24, 2008
    Location:
    London
    Car:
    W204 C180 Executive SE 2013 Automatic / COMAND NTG4.7 and Morel speakers fitted by www.comand.co.uk
    Have you been told of any fault codes found when the car was connected to STAR (or other code scanner)?
     
  3. moonloops

    moonloops MB Enthusiast

    Messages:
    5,294
    Joined:
    Oct 8, 2009
    Location:
    :Location : Location
    Car:
    W204 C350 CDI AMG Sport
    Maf !

    ?
     
  4. markjay

    markjay MB Club Veteran

    Messages:
    24,906
    Joined:
    Jun 24, 2008
    Location:
    London
    Car:
    W204 C180 Executive SE 2013 Automatic / COMAND NTG4.7 and Morel speakers fitted by www.comand.co.uk
    Incidentally, which 'Leads' would these be? As far as I know your car does not have HT leads (though I may be wrong).
     
  5. SPX

    SPX MB Club Veteran

    Messages:
    16,038
    Joined:
    Aug 29, 2010
    Location:
    Yorkshire
    Car:
    That one
    Sounds like injectors to me.
     
  6. markjay

    markjay MB Club Veteran

    Messages:
    24,906
    Joined:
    Jun 24, 2008
    Location:
    London
    Car:
    W204 C180 Executive SE 2013 Automatic / COMAND NTG4.7 and Morel speakers fitted by www.comand.co.uk
    As far as I know injectors problems tend to manifest themselves at higher engine loads/revs rather than at idle?

    Also, given that the problem appears to be temperature related, have they considered the ECU temperature sensor (or its wiring)? A faulty unit would feed incorrect data to the ECU potentially causing over-fuelling etc. But this needs to be checked with Live Data stream on STAR or similar equipment.
     
  7. SPX

    SPX MB Club Veteran

    Messages:
    16,038
    Joined:
    Aug 29, 2010
    Location:
    Yorkshire
    Car:
    That one
    If it's injectors, it'll run like a bag of spanners at idle and under load.
     
  8. rpe2

    rpe2 Active Member

    Messages:
    400
    Joined:
    Aug 6, 2006
    Location:
    Silchester
    Car:
    2010 E350 CDI, 2016 Ford SMax
    Crank sensor for the cutting out whilst warm (assuming this isn't what you refer to as the TDC sensor).

    This rarely shows up as a stored fault, but it can be tested by removing it and dipping the (non connector) part in a cup of hot water. If the resistance changes from cold to hot, it indicates it may be on its way. The part is circa £65, located on the top of the bellhousing.

    As for the MAF suggestion above, disconnect it and see how it runs (it will fall back onto a default map)
     
Tags:

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.