Diesel Smell inside cabin (W212 E350cdi)

Discussion in 'Engine' started by Turbo1, Jul 22, 2017.

  1. Turbo1

    Turbo1 Hardcore MB Enthusiast

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    My seven year old Mercedes E350cdi has developed an odd problem where there is a smell of diesel fuel in the car when the engine is running and the car is stopped. Truth be told it smells more of exhaust/diesel fumes.

    Now when the car is moving the smell vanishes but when stopped at the lights it builds up and can be quite bad. Not the extent where it makes you feel unwell, but enough to make you take notice and think, god that smells bad.

    I cannot see any evidence of a diesel fuel leak inside the engine bay or around the fuel filter, nor can I find evidence of injector leaks.

    What could it be?
     
  2. GordonTarling

    GordonTarling Hardcore MB Enthusiast

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    The usual culprit for this problem is a leaking injector seal(s). Take the top cover off the engine and it should be obvious if there's one leaking when you start the engine. There's also often an associated build up of crud around the one that's leaking.
     
  3. OP
    OP
    Turbo1

    Turbo1 Hardcore MB Enthusiast

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    I was concerned it could be the exhaust manifold - done this and there is no sign of this.
     
  4. splitpin

    splitpin Hardcore MB Enthusiast

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    Similar problem with 05 320cdi, injector seals all good.

    Not always apparent though.
     
  5. OP
    OP
    Turbo1

    Turbo1 Hardcore MB Enthusiast

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    No. I cannot see signs of soot or anything in the back of the engine bay-I'll take it into a specialist place tomorrow and see what they make of the car.

    It's had two fuel leaks in the year I've had it. I hope it might be another one like that as most of the time these are inexpensive parts - the last one costing £7.
     
  6. rf065

    rf065 Hardcore MB Enthusiast

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    Mine had this a month or two ago, flexi pipe on the exhaust had fractured and it's exhaust fumes you smell. Custom exhaust place welded a new flexi pipe in place for £70 rather than buying a new exhaust.

    Russ
     
  7. OP
    OP
    Turbo1

    Turbo1 Hardcore MB Enthusiast

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    Right.

    Not a leaking injector. Garage confirmed this. No chuffing noise either - no diesel residue/tar in injector area.

    No exhaust or manifold leak. The garage advised if there was the heat shield on the rear bulkhead/engine bay would be dirty.

    The smells gone and they advised probably just a residue of diesel from the last fuel leak.

    Given I've been to Ullapool and back via Poolewe and I live in Glasgow it seems fine and no more smells stuck in traffic jams due to the massive number of roadworks/campervans/etc on the journey.


    Sent from my iPhone using Tapatalk
     
  8. DanMorgan

    DanMorgan Hardcore MB Enthusiast

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    Although yours is not the injectors, I had this exact problem and the injector was leaking
     
  9. Druk

    Druk Administrator Staff Member

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  10. OP
    OP
    Turbo1

    Turbo1 Hardcore MB Enthusiast

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