2008 308 HDI 2.0L - black smoke when accelerating
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  1. #1
    Tadpole
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    Default 2008 308 HDI 2.0L - black smoke when accelerating

    Hey all.

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    As title says, my 2008 pug 308 2L hdi auto is puffing out bit of black smoke when accelerating. Not huge amounts but enough to notice it when following. 121k on the odo and a good service history. Read this can be caused by a blown turbo but power seems perfectly fine.

    Short of getting it looked at, where should I start in the diagnostic process? Any other common causes?

    Cheers

  2. #2
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    All diesels run rich when accelerating. The job of the filter system is to catch the unburnt fuel soot. When the filter internal pressure rises sufficiently the computer will alter combustion to burn it off. The catalyst charge is to aid that. It could be one of several things, so I think an error code check is called for.

  3. #3
    1000+ Posts Kim Luck's Avatar
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    First place to look at is the air intake system and filter. A blocked filter or tract in a diesel will produce volumes of black smoke. Black smoke could also be caused by a partially blocked particulate filter. A 100 km total run up the highway and back at 100 km/h should quickly unblock the dpf.
    Don't it always seem to go that you don't know what you've got 'til it's gone............

  4. #4
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    A regen doesn't even need high speeds. An uninterrupted 20 minute run (motorway) will suffice. However a simple FAP blockage from overdue regeneration in a Peugeot produces an error message on the dashboard and throws an error code.

  5. #5
    Tadpole
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    Thanks all.. I'll start with checking out the air intake / filter I guess. No errors on the dash and it does frequently get driven up the highway for decent streches.

    What tool do I need to interrogate engine errors?

  6. #6
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    A simple generic OBD code reader will get error codes. To get detailed sensor info you will need Diagbox on a Win laptop.

  7. #7
    1000+ Posts Rod Hagen's Avatar
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    Took me a few months of "semi country" driving to get rid of the occasional rear end puff of black in my my HDi 407SV estate. That said, I haven't seen anything similar now for several years. Try a good "country run" and if it doesn't clear , then check your codes.
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    Peugeot 407 SV HDi estate 2008, Peugeot 407 SV Hdi Sedan 2006, Peugeot 406 ST (deadish), Peugeot 307 XSE, - Previously 403s, 404, 504, 505 sLI Wagons, 306 XSi, Renault 12, Citroen DSpecial

  8. #8
    Tadpole
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    Thanks all - good food for thought.

    What is the difference between using a generic OBD code reader and a PP2000 Lexia 3?

  9. #9
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    See my post above. PP/Lexia are replaced by Diagbox.

    Simple OBD error codes may often be sufficient to diagnose a problem, but they cannot recover the sensor data held in the computers.

  10. #10
    Tadpole
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    Hi All

    Just an update (I know its been a while). Issue is still occurring, no better, no worse.


    1. I did a good 400km highway run a few weeks ago
    2. Have checked air intake up-to air filter ingress point, and all is clear. Air filter itself looks OK, but have a new one on order just to be sure - ETA 1 week.
    3. Purchased an interface cable/Diagbox thing. After much mucking around, got it working. Things of note:
      1. P1351 - Pre-Heating Relay Circuit
      2. F5FF - Unexpected reinitialisation fault coming from the BSI
      3. Info - DFP has 18g of soot and did a regen 350km ago
      4. Info - Elosys tank is 51% full (I know this is calculated only, should be visually inspected. Just not sure where to look exactly.


    Not sure if P1351 would be related to this issue, I'd say not, research indicates as long as 3/4 glow-plugs are functional the DPG regen still occurs. And the log also indicates it is occurring.

    Any thoughts?

    Appreciate the help

    Cheers

    Stew

  11. #11
    Fellow Frogger
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    Sometimes you can get excess black smoke if there is a split turbo air hose, so check them carefully. Perhaps, test the vacuum hoses are holding a vacuum in case you have low boost due to the common split y-piece or a leaky diaphragm in the air mixer/doser valve at the front? The EGR valves don't last forever either.

  12. #12
    Tadpole
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    Quote Originally Posted by David S View Post
    Sometimes you can get excess black smoke if there is a split turbo air hose, so check them carefully. Perhaps, test the vacuum hoses are holding a vacuum in case you have low boost due to the common split y-piece or a leaky diaphragm in the air mixer/doser valve at the front? The EGR valves don't last forever either.

    Thanks David

    I remember reading about the split vacuum tubes being a problem - any pointers on locating this (and the turbo hoses in question?)?

    Cheers

  13. #13
    Fellow Frogger
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    Even if it is not your problem, it is worthwhile being aware of that y-piece, so read through this and the linked thread re Pug:
    C5 power down
    (Listed in the Citroen-related thread that may help for later Pugs: The Thread of excellent threads! )

    The air handling hoses are essentially the large ones that aren't for coolant! Look particularly at oily areas for splits or weakness.

  14. #14
    Tadpole
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    Thanks David

    Confirmed the y-piece is intact.

    All air hoses that I can see look OK (that is, air intake -> filter, filter -> rear of engine -> no visibility as it loops into the turbo down the back and into the intercooler (so unsure about that) -> intercooler to engine OK).

    Hopefully the new air filter arrives soon

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