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Thread: air box mod / black smoke

  1. #1
    Regular Member Guss's Avatar
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    Thumbs up air box mod / black smoke

    HI all
    I have had my Vauxhall signum 3.0 cdti now for about three weeks.( upgraded from a rover mg zr TD)
    I have noticed like it is well documented that it smokes quite a lot on hard acceleration, the harder the acceration the darker the smoke.
    It is black smoke..have noticed the car does run a bit lumpy could these be interlinked?
    Whilst trying to clean the maf ( which wasn't dirty found out afterwards) i managed to get the car in limp home mode..here she didnt smoke?? this is even during reving whilst sitting in neutral!
    I have also read about an airbox modification..can anyone tell me what this involves and how to do it if its not been already done?
    My car is on a 53 plate and i am now the 3rd owner and it looks like the car has been left totally bog standard.
    great forum just by the way

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    Search the how to section for the airbox mod: http://www.vectra-c.com/forum/showthread.php?t=70471

    as for the smoking... the car will not smoke in limp mode due to the fact the turbo will not be running, start with the air filter if its clogged it will cause smoke due to lack of air... then work your way round the boost/intercooler system for any air leaks, these too will cause black smoke (overfuelling).
    I'm not farmiliar with the v6cdti but i would be looking for the boost sensor & egr valve & see about cleaning them too.

    hth

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    Regular Member Guss's Avatar
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    superb thank you dth..
    what does the boost sensor look like, i am guessing now, is it near the turbo?

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    it's located on the intake manifold, little black plastic unit probably bosch

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    Have you had any of the codes read that will have been saved when the car went into limp mode?

    Boost sensor (difficult to see, so lean right over the engine) is two bolted to intake manifold at top right hand side of engine underneath the black plastic engine breather tube that you will need to free up to get at it. You must remove engine cover first (requires torx bit). Boost sensor is small squarish black box with a wiring connection. Not the other device with the vacuum tubes running to and from it (and wiring connector), which you will also need to remove to get to the boost sensor. Careful when removing the other device as the small cylindrical filter is easily broken off.

    P.S. Cleaning the EGR valve is a very involved job on this engine, that requires the removal of much of what you can see on top of the engine in order to get at the valve (left hand side of engine connected to rear lower end of corrugated metal tube).
    Last edited by diesel dog; 22nd August 2011 at 13:48.

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    Also: Airbox mod has no real benefit to the performance of engine (airflow to the turbo is more than sufficient as standard), but it does no harm to remove it, and you may want to change the filter anyway.

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    Regular Member Guss's Avatar
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    thanks guys..i am going to have a dable at it today / tomorrow

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    hey diesel dog..the filter is new, the place i bought the car from ran a service on it, but had it all off this morning and hoovered out all the crap the car has sucked up underside of the filter of course..
    any ideas why it might be running a bit lumpy, could it be a blocked fuel filter?

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    Quote Originally Posted by Guss View Post
    hey diesel dog..the filter is new, the place i bought the car from ran a service on it, but had it all off this morning and hoovered out all the crap the car has sucked up underside of the filter of course..
    any ideas why it might be running a bit lumpy, could it be a blocked fuel filter?
    If you post in the 'engine & drivetrain' section, you will get a better response to this question. The problems with poor running on the V6 are varied and difficult to get to the bottom of. First thing to do is get the codes read.

    I was fortunate that my V6 always ran well, even if some of the other parts fitted around it (DMF etc) didn't want to do likewise.
    Last edited by diesel dog; 22nd August 2011 at 14:21.

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    Vehicle : Opel Signum

    Trim : Sport

    Engine : 3.0 CDTI

    Year : 12/03

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    Black smoke under hard acceleration is caused by a faulty (or poor) EGR valve or just an engine that's never pushed to the redline in gears. It could be a split intercooler hose, or damaged intercooler, but that would put the car in limp mode. Grey smoke is a fuel issue and possibly bad injectors. I have problems here in Slovenia as I can't really push the car hard to clear its lungs or fill up with good fuel...all we have is the average diesel. The car didn't smoke in Germany, Belgium, UK...

    A (partially) blocked fuel filter would hinder engine performance. What's your mileage?

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