2007 E320CDi glow plug light on

Discussion in 'Engine' started by DrNick, Dec 13, 2016.

  1. DrNick

    DrNick Active Member

    Messages:
    513
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    Nov 25, 2003
    The glowplug light on my 2007 E320CDi has come on.

    The light comes on as normal, goes off and then I start the engine. Immediately the light comes back on and stays on for about a minute.

    It started behaving like this for a week or so, then it cleared itself and behaved normally for a couple of weeks.

    Now its back to misbehaving. The resistance of the plugs has been measured and they are pronounced ok.

    The light does not stay on if starting from a warm engine.

    Any clues before I start looking for glow plug relays?

    TIA

    DrNick
     
  2. johnny 1

    johnny 1 New Member

    Messages:
    24
    Joined:
    Nov 17, 2015
    Car:
    c220 cd1
    It could be a glow plug need replacing


    Sent from my iPhone using Tapatalk
     
  3. 4life211

    4life211 Active Member

    Messages:
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    Car:
    mercedes 211
    it is glow plug relay.
     
    wu56Shoozz likes this.
  4. wu56Shoozz

    wu56Shoozz MB Enthusiast

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    Location:
    You'll need a passport to get over the Wall..
    Car:
    MB Vito 111CDi / W203 C Class Saloon 320CDi Avantgarde
    ^ Wot He Said.

    Don't buy an aftermarket relay as their crap (Ask me how I know) I was advised to buy 6 new plugs and a relay as the relay fails it burns out the glowplugs when used...look on ebay for a company called mercedesofnewcastle typed like that .. I've managed to negotiate a bit of discount of them and they've been really helpful..
     
  5. Orwic

    Orwic Member

    Messages:
    58
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    Sep 5, 2008
    Location:
    London (and sometimes N Wales)
    Car:
    E320 cdi Sport (C240, retired)
    I had a similar issue. The fault was diagnosed as a faulty glow plug. Replaced them all (just a few days ago) and all OK now. Hope so, anyway, as I haven't used the car since...
     
  6. KennyN

    KennyN MB Enthusiast

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    Normally a faulty relay leads to extended cranking when cold and the GP light coming back on is one or more plugs being faulty.

    Plugs are around £70 a set and the relay is double that, both are easy to DIY if you have the time and tools.

    The fact that is ok sometimes may point to a wiring issue as if the relay or plugs are knackered then they are knackered and you would be getting the fault all the time.

    Kenny
     
    Last edited: Sep 16, 2017
  7. paul73mt

    paul73mt Active Member

    Messages:
    675
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    Jul 18, 2012
    Location:
    Essex
    Car:
    2010 C350 CDI Sport sold , 2015 E250 CDI AMG Line Sold
    had the same thing and was the glowplug relay module. i checked the glow plugs myself just by measuring the resistance of the glow plugs all mine were below 1 Ohm.

    Where are you based??? have a Star Machine here if you want to plug it in
     
  8. charlieboy2608

    charlieboy2608 New Member

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    May 24, 2016
    Car:
    mercedes CLS 320 CDi
    What fault code is shown to prove its the glowplug relay module?
     
  9. paul73mt

    paul73mt Active Member

    Messages:
    675
    Joined:
    Jul 18, 2012
    Location:
    Essex
    Car:
    2010 C350 CDI Sport sold , 2015 E250 CDI AMG Line Sold
    No. All i had was it would come on as you started it up then go out but when you was driving it would come on every so often. They up rated it if you can see underneath it the base should be silver, if its black then its the old type.
     
    Last edited: Sep 18, 2017
  10. OP
    OP
    DrNick

    DrNick Active Member

    Messages:
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    Nov 25, 2003
    I never got around to sorting it out. It wasn't causing any issues in terms of starting and then I had the opportunity to get another car. So I sold the old one with full disclosure.
     
  11. zipdip

    zipdip MB Enthusiast

    Messages:
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    Location:
    Essex
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    Well one way to get rid of a glow plug problem sell the car,for most a cheap scanner will tell you which glow plug it is,if you run a V6 the plugs are numbered looking at the engine from the front 123 going back on the left side and then 456 going back on the right I had 5 go cost about £15 and 20 mins work.
     
  12. Markssl

    Markssl Active Member

    Messages:
    493
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    Jul 23, 2014
    My experience of this issue....
    When my GP light stayed on it was a glow plug issue. The car still started fine but I changed all plugs. A subsequent issue some years later was the GP light would go out as normal but the car wouldn't start from cold. After long cranking periods it would start. I assume the piston movement heated the engine. I Changed the GP relay and now it starts perfectly.


    Sent from my iPhone using Tapatalk
     
  13. avantgardeauto

    avantgardeauto Member

    Messages:
    51
    Joined:
    Jul 23, 2010
    Location:
    Bristol
    Car:
    Mercedes-Benz C320CDI & SLR McLaren Coupe
    I would check the fault codes first...it might just need 1 plug.
     

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