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problem with cold start! W211 320 CDI

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by robert_winter_1000, Mar 9, 2018.

  1. robert_winter_1000

    robert_winter_1000 Senior Member

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    Your Mercedes:
    MB E350 CDI (W212)
    For almost a month I am having a problem with the cold start of the engine of my W211 320 CDI. When the car is cold in the morning, the engine must turn about 10 times before it starts. In the past, this was not the case. There is no message / light on the dashboard. As well there is no smoke when it starts. Let the car tested by STAR but the report didn't show anything wrong!

    Any advice will be appreciated.
     
  2. Wighty

    Wighty Senior Member

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    Your Mercedes:
    W211/E320cdi/2009 and CLK200k 2009
    Could be the glow plug relay ? I had similar symptoms with my E320cdi . You always have to be careful with throwing money into guesswork . The relay is about £100.
    Does the glow plug light come on and go off when the car starts ?
     
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  3. OP
    robert_winter_1000

    robert_winter_1000 Senior Member

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    Yes, the glow plug light come on and go off when the car starts! As well, the STAR Diagnostic couldn't find anything wrong!
     
  4. Wighty

    Wighty Senior Member

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    See if any people who know what they are talking about think it could be the relay . :D
     
  5. mersum1es

    mersum1es Senior Member

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    Your Mercedes:
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    Is this V or inline engine? Inline engine starts better without glow plugs...

    Did you check injector correction values when plugged in star? If value is over +3 it might show faulty one... Did you check live data, how was rail pressure rising during cranking? Like said many times car does not trigger fault code if pressure is just too low during cranking.

    Now you can measure injector back leak... I'm 80% sure you found culprit there... LOL
     
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  6. Westheath

    Westheath Senior Member

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    Replacing the fuel filter is usually a cheap place to start.
     
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  7. Botus

    Botus Senior Member

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    if it has full power when hot and starts quickly and drives well when fully warmed up... its VERY likely the glow plugs and or the control module (called a relay but is more than just a relay) glow plus are a service item (every 60 k or so) the "relays" go wrong at 7 to 10 years on every car
     
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  8. Paul1948

    Paul1948 Senior Member

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    My S class had the same problem a few years ago, used Easy Start no problem, my indy said at the time it was a leaky injector and sure enough when they were tested two faulty ones were found, no problems since.
     
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  9. OP
    robert_winter_1000

    robert_winter_1000 Senior Member

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    Many thanks to all of you for your kind advices. The car is going to go to the garage for reparation. I will let you know the reason(s) as soon as I know it.
     
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  10. OP
    robert_winter_1000

    robert_winter_1000 Senior Member

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    Your Mercedes:
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    The Problem is solved!

    Hello all,

    Wighty is right! It was the the glow plug relay. I asked the engineer why STAR didn't show this in the first test? His answer was because at that time the relay was not completely demage but on the second test was.

    Again many thanks to all of you for your kind efforts.

    Kind regards,

    Robert
     
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  11. Wighty

    Wighty Senior Member

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    That's not something we hear much :D ! Glad it's now working .
     
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