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Thread: blue smoke 3.0 cdti signum help!!!

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    Exclamation blue smoke 3.0 cdti signum help!!!

    Bought a 2006 signum 3.0cdti 5 months ago 71000 miles full service history,very happy except , it some times puts out blue smoke when i have done a few miles and slow down to go round a roundabout for example, when i pull away the car hesitates then goes ok but blue smoke comes from the exausts for about 1 mile. if i stop the car the exauxt system is very hot. i was a diesel fitter many years ago but on common real diesel engines and am not sure where to start with this problem. This has only happened 6 times in 3000 miles.engine runs very clean the rest of the time. Can anyone help

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    Could be a couple of things but as you say it's only happened a few times in 3k and that the exhaust gets very hot I think it's perfectly normal as it's probably the diesel particulate filter regenerating. What's the fuel computer say when its smoking? About 1.1 gal per hour? Worst case it could be turbo on it's way out.
    Now I need a turbo to keep up!

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    Now I need a turbo to keep up!

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    Blue smoke = burning oil somewhere, if it was diesel over fuel it would be black smoke.

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    Quote Originally Posted by DaveW555 View Post
    Blue smoke = burning oil somewhere, if it was diesel over fuel it would be black smoke.
    Then wouldn't it be more noticeable? Or do it more often? That's why I thought DPF but never having seen one regen I'm not sure tbh.
    Now I need a turbo to keep up!

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    Yeah its a toughy but blue smoke usually always points to oil burning, diesel smoke is usually black and sooty. without seeing it I suppose all we can do is guess.

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    Quote Originally Posted by DaveW555 View Post
    Yeah its a toughy but blue smoke usually always points to oil burning, diesel smoke is usually black and sooty. without seeing it I suppose all we can do is guess.
    Yeah thats what I thought and sort of suspect the turbo oil seals. Guess we will have to wait for the op to give us some more info
    Now I need a turbo to keep up!

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    What is the service history like?
    What type of oil is being used?
    What is the oil level and consumption?
    Have the oil stems been inspected?

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    Just been to vauxhall garage for some advice,They are not sure either but have not had a lot of 3.0 v6 to repair.they agree its getting a gulp of oil from somewere if it was fuel it would be black and would suspect DPF but he suggests cleaning out the EGR valve.Also i have to keep an eye on the oil level as it was a bit high , he has seen faulty DPF putting fuel into the sump.Has anyone blanked off ERG on this engine ?.
    full service history vauxhall
    engine perfect
    turbo ok
    rember this only happens occasionally
    got service manager to drive behind me .gave it some stick and he said the was no smoke black or blue it was running very clean
    what now?

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    You will get (black) smoke when the engine is cold, but it should not be readily visible, especially when you go from "tickover" to "foot down"

    However, the blue smoke is not a good sign
    Do NOT overfill the oil in 3.0 V6 CDTI
    Equally, do NOT allow it drop below the minimum (it will suck oil through breather and damage can happen rapidly)

    I try to keep my oil level as near to half way as possible
    It did drop to the minimum once and I noticed the smoke increased dramatically
    Equally, after a service I noticed large amounts of smoke, carried out a dipstick check and had to get the dealership to drain about 250ml out of the sump

    Have you been taking the oil reading when the engine is cold, when it has been running on idle for a few minutes, or hot?

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