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Thread: problem with signum 2.0 dti loss of power

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    Default problem with signum 2.0 dti loss of power

    Hi to all, im new on here. I need help, my 04 plate signum 2.0 dti has been giving me problems with loss of power. The throttle just loses power, the engine management light comes on, sometimes the engine feels like it's going to stall completely. Other times it clears itself, the power picks up and away it goes as if there is nothing wrong. This as now been going on for about a year or so.
    I've taken it back to the local vauxhall garage (where I bought it from) they've attempted to sort it, given it back to me saying all's well, then I get the same prob a few days later. Having been back in several times, they said that they are not sure how to fix it, but if I wanted to carry on paying their prices, they would keep playing with it.
    So I tried local a garage who, fair play to him, seemed to sort it saying it was the butterfly valve. He cleaned and adjusted it and that seemed to fix it, but he too has had it back 4 or 5 times now (same problem). I picked it back up again today and took it for a test drive, only to find all the same faults and problems.
    Now I'm no car mechanic, so I have to listen to these guys and take what they say as fact but its getting me nowhere, SO PLEASE CAN SOMEONE HELP

  2. #2
    Regular Member marktaylor's Avatar
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    1 if a dealer has said they have mended it and youve paid then surely if it goes wrong again with the same symptoms its there problem to fix it as they obviosly havent done it so why would you keep paying for it

    2 get the codes read then youll know whats wrong

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    hi mark thanks fo the reply,
    I didnt pay after the second time with vauxhall. The local guy as been grt he didnt even charge me for any of his work on 3 occasions he had the engine magement faults read everytime i took it in too him it kept coming up with the same fault and now bless him i think even he is feeling beat by the thing and says I should it take it back to vauxhall but i dont want to pay the high price

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    Regular Member Ziggy's Avatar
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    Vehicle : Saab

    Trim : 9-3 Vert

    Engine : 2.0

    Year : 2000

    Default

    Do you know the fault code? I presume all the standard dti things have been checked such as all pipes.

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    Regular Member Innes's Avatar
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    You really need the codes read.

    It could be:
    a perished vacuum pipe.
    Faulty Vacuum Solenoid.
    Faulty MAF
    Boost Sensor
    Sticky EGR
    Perished inter cooler hose.

    Its all guess work until you post up the codes.

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    Hi
    I've had the codes looked at and cleared (there were loads when I first had it done). the guy who did it said that the next one to show would be the problem and it was something to do with the throttle sensor? That's been looked at, as have the vacuum pipes (one needed replacing) and the butterfly valve has been adjusted. He tried the diagnostics again after I told him that I still had a problem and there is no code showing up at all.
    The problem seems to have changed slightly now that some work has been done on it - before the fault would clear if I switched off and restarted the engine (and the light didn't always come on - the spanner one) but now the spanner lights up and the engine will do no more than about 30 mph tops - if I keep going the problems clears itself after between 10 secs and a couple of minutes. If I switch off and restart now the fault remains. It's causing me big problems as it happened recently on the Motorway and I nearly got rear ended.
    It seems like some sort of fuel issue as there is a LOT of black smoke coming out of the exhaust when this happens and something smells hot. But when the fault clears, all is fine.
    Thanks for the ideas so far. ANY ideas and help are appreciated.

  7. #7
    Full Member bobssignum's Avatar
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    Vehicle : Signum 2.0 DTi

    Trim : Elegance/Elite

    Engine : 2.0DTi

    Year : 2003

    Mileage : 73350

    Default

    hi m8

    With your engine running disconect the vacuum hose from diagfram that attaches to the inlet manifold this is the one at the front of the engine bay .
    wet the finger and check for suction it is only 0.6 bar but is detectable with a wet finger
    If its detectable then replace and check the other two hoses , while your doing this check that they are connected up the right way round , the actuattors are marked up on the top where the hoses enter and leave each actuattor.
    Right now assuming that all that has been checked and no faults have so far been found .
    Have something handy to block up one of the hoses , then run the car as normal until the fault returns , then remove the first vacuum hose ie the one to the inlet manifold and block it off .
    This should stabalise the engine if it does not then suspect one of the actuattors being faulty or very rarely it may be the vacuum pump itself.
    Driving vauxhall,s for 30 + years
    and still loving it

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