X3 M57 diesel cold start rough idle and smoke

Discussion in 'X3' started by Tsq, Dec 5, 2018.

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  1. Tsq
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    Tsq

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    Hi guys I am new here and would really appreciate some help in diagnosing this issue. It starts fine but seems to be starved of something? air ? fuel? after about 30 seconds it seems to behave normal. However have a really strong diesel smell coming from exhaust. Cheers tony
     
  2. slim_boy_fat
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    slim_boy_fat WARLORD Site Supporter

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    Welcome aboard, Tony.:wavey:

    In the absence of any warning lights etc, your best bet would be to get the fault codes read. If you don't have a reader or know someone who has, a good Indy out to be able to pull them, and will be cheaper than the Dealers.
     
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  3. Tsq
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  4. Tsq
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    sorry the engine code is 306D3 bmw X3 06 3.0D
     
  5. Tsq
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    Tsq

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    I already went to a mechanic and nothing really came through on the diag report. He has stated that the problem is the intake manifold needs to be replaced. I call BMW Melbourne Australia and they are quoting me $1900!!
     
  6. Tsq
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    M57D30TÜ to be exact
     
  7. snrbrtsn
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    snrbrtsn WARLORD Site Supporter

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    I’d “suggest” glow plug controller / glow plugs
    However a fouled inlet manifold is realistic also

    As mentioned a code read will determine cause
     
  8. Tsq
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    Tsq

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    Thank you snrbrstn your for reply. Keep inmind i have no issue with the start up just the idle for about 20 seconds it fluctuates then start to settle. Do you where i can buy a brand new manifold preferably a genuine one. Here in Australia the ripp you with prices
     
  9. Tsq
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    I forgot to mention it blows bluish smoke during the rough idlewild
     
  10. Tsq
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    The code read came up as glow plugs 1-6 and controlor. But the mech said its the inlet manifold...wtf
     
  11. Alan Gunn
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    Alan Gunn

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    You need to get the glow plugs and controller changed and give the intake a good clean at the same time.
     
  12. markyboyt
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    Running rough from cold start could be an injector fault but that would ideally need monitoring on diagnostic equipment capable of showing the smooth running values for the car. That would need someone looking at it who has an idea what they are looking for and who has the equipment to read the values.
    I assume the initial diag session didn't show any fault codes? Worth noting that some generic readers wont show some bmw specific codes so you might need them reading on something more specific to bmw.
     
  13. Singvogel
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    Singvogel Moderator WARLORD Site Supporter

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    If it clears up with a minute or so I would be thinking glow plugs.

    Good luck.

    And welcome to the forum, by the way.
     
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  14. JasonH
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    Unless the ambient temperature is really low, like below -5C, I wouldn't blame the glow plugs. On BMWs even if all glow plugs are dead it will start and run down to about -10C or lower. If those are your ambient temperatures then your symptoms probably are about right.

    Otherwise I'd be looking at leaky or tired injectors. A leak down test can be carried out. Diagnostics can perform a smooth running test and show live correction values for each injector.

    Intake manifolds do clog up on high mileage diesels that do short journeys. They can even clog up at mileages like 70k if all journeys are short. But it rarely seems to cause problems.
     
  15. snrbrtsn
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    snrbrtsn WARLORD Site Supporter

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    I believe the ambient temp is circa 8degrees for the glow plugs

    That’s when all manner of things come to life, heated mirrors, brake drying pulsation etc
    Likewise, it’s the change point from summer to winter tyres

    The traits of rough running for circa 1 minute after start up does suggest glow plugs and controller as they remain functional for similar length of time
    The injectors would be continual problems and rough top end power delivery
    The inlet manifold would effect pull offs from standstill and poor power delivery
    The EGR being fouled would replicate the inlet manifold traits allbeit would contributed and make things worse

    Playing the guessing game of course as remote diagnosis is often difficult!
     
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  16. Singvogel
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    Singvogel Moderator WARLORD Site Supporter

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    There are loads of factors which can give symptoms of rough idling.

    If an injector has been replaced and not coded for example.

    The glow plugs do play a role (albeit a small one) even after the engine is up to temperature as in modern engines they do not only function for low temperature starts.

    A dirty inlet manifold and associated pipework coming from the turbo and intercooler will cause power losses at all spedds and temperatures.

    The EGR is likely to clog owing to oily vapour coming from the turbo through the intercooler and mixing with sooty exhaust gases.

    Short low-speed journeys can result in a disproportional amount of EGR opening and crud build up - it is a pretty solid lot of carbon reducing the diameter and thus the air-flow through the EGR.

    The inlet manifold can then be full of a syrup like black sludge.

    But my money is on the injectors.
     
  17. Tsq
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    Thanks for the feed fellows really appreciate it. I will have take it step at a time. I will start by cleaning out pipes and valves and change air filters. Fyi i put in some good injector cleaner yesterday and it eliminated atleast 80% of rough idle..and recovered quicker to normal idle
     
  18. Spuffington
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    Spuffington Moderator WARLORD Site Supporter

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    Afraid I had the coked up inlet manifold issue on my last X5; exactly the same symptoms as you. BMW replaces under warranty at that time and solved the issue.
     
  19. Richyroos
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    Why would you need a new inlet manifold?? Unless it is physically cracked or broken, it shouldn't be necessary. If it is badly coked up - it can be cleaned, a filthy job to do but just a bit cheaper than a new manifold! As has been suggested by several replies - a BMW diagnostic check will tell you what is wrong, ideally by an Indy, as it will be a lot cheaper than a BMW main dealer, but you may have to bite the bullet if you don't have an Indy, or your garage doesn't have top notch diagnostic equipment.

    You haven't mentioned the mileage the car has covered, that could be relevant to problems with parts such as injectors. I assume that you are using decent fuel, and not chip fat or anything like that??
     
  20. Tsq
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    Tsq

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    Thanks for reply. The X3 has done 200.000kms. The first 2 things i will start with is cleaning inlet manifold and adding blocking plates and 2nd is blocking egr pipe. Is this a good place to start in to prevent future issues?
     

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