2008 C5 SX 2L Hdi blowing black smoke
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Thread: 2008 C5 SX 2L Hdi blowing black smoke

  1. #1
    Fellow Frogger!
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    Default 2008 C5 SX 2L Hdi blowing black smoke

    We've traveled almost 80,000 kms since buying our 2008 C5 SX 2l Hdi in Oct 2014, she has just ticked over 200,000 kms. She hasn't missed a beat for the entire time. All we have done is oil and filter changes every 10,000 kms.

    We've recently noticed that under heavy acceleration, whether from rest or to overtake, she is blowing black smoke quite heavily. Any suggestions on why and what the issue could be and how to stop her blowing smoke? We have no other symptoms.

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  2. #2
    1000+ Posts gerrypro's Avatar
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    Particulate Filter?
    Cheers Gerry

  3. #3
    Fellow Frogger
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    It can belch if it's somehow stuck part way into a particle filter regeneration. A decent drive may fix that. Short, low speed trips will tend to make it worse.

    Look for simple issues that might result in a loss of boost such as a split turbo air hose (it will likely be oily) or a vacuum leak. It may try to compensate by adding a bit more fuel.

    Have you had the Eolys additive for the particle filter refilled yet? It was meant to be good for about 160K, but you seem to be piling the miles on very quickly, so it would likely go further. You should encounter a pollution warning when it thinks it has run out of Eolys, but it doesn't directly measure the remaining volume, inferring only how much should remain from the number of additive pump cycles and the specified starting volume. If it was short-filled to begin with, you may have run out and the particle filter may not be regenerated as expected. At 200K, it may be sensible to have the tank refilled and the counter reset.

  4. #4
    Ram
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    Hi,
    If you do not have any disconnected hoses . My experience is it will be the EGR if fitted , Exhaust Gas reticulation valve, the poppets come off. I had a similar experience with my HDi Dispatchat at 143400km . The analysis was a torture of time, 4 months and money at the local level ( $4500),but Cullens at Nambour fixed the problem in 2 days and about $400. They have sensible rates and expert Citroen trained staff who see many similar cases it seems. Good Luck

  5. #5
    Fellow Frogger
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    Yes, the EGR valve can fail. On the motor in question (RHR), either the valve head falls off or the actuating arm (inside the cover) comes off the motor spindle when the weld fails. Maybe, it's repairable with some careful welding? It would be hard to start when it's failed open.

  6. #6
    UFO
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    CitroŽn Tragic UFO's Avatar
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    Adjust the rear view mirrors.
    Boyracer and jaahn like this.
    Craig K
    2009 C5 HDi Exclusive

  7. #7
    Fellow Frogger! tasie C5's Avatar
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    Have a quick trip to Longreach. Not far is it?

  8. #8
    Fellow Frogger!
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    Had exactly that problem in my earlier model C5. There was a crack/split in the rubber hose into the engine. This is after the air measuring device so it got the mixture wrong, especially when accelerating. Once fixed it is behaving normally again.

    Regards

    agd123

  9. #9
    Fellow Frogger! Balki's Avatar
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    as agd123 said there is a small y peice in the pipe just above and behind the oil filter, often it has a hair line crack in it from bumping the pipe when changing the oil filter, new ones are redily avaiable at the garden section in the hardware store

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