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Thread: Spanner light and loss of power on 3.0 CDTi

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    Default Spanner light and loss of power on 3.0 CDTi

    I have a problem with my Jan '05 Signum Design 3.0 CDTi which essentially makes it unusable. The garage have been pretty good but have been unable to locate the problem which has so far been intermittent. I would welcome your comments if anyone has experienced the same or knows what might be wrong.

    Two years ago, under warranty, it spent over two weeks in the workshop and showed consistently clean on a full diagnostic until the Service Manager eventually found a fault with the air flow meter - using a digital multimeter as it turned out, rather than the full garage diagnostic kit. Air flow meter was replaced and car was mostly ok, very occasionally faulting in wet weather but resetting if the key was removed. I was pretty sure something still wasn't right but it was so intermittent I could never reproduce it on demand - until now.

    I have seen the fault more in cold and wet weather, usually when the engine is just warming. If I accelerate (not necessarily firmly) the spanner light comes on and the engine loses power just as I release the throttle. This is accompanied by a whistling noise which I believe may be the overboost valve releasing air from the turbo. The power is so low that if I bury my right foot in the carpet in third gear, the maximum speed I can achieve on the level is just over 30mph. Most of the time I am afraid to overtake or pull into traffic in case the car decides to drop 90% of its 170-odd horse power and leave me stranded at lawnmower speed on a busy road.

    When the car is in the fault condition, the alarm / ultrasonic light on the console comes on and the car will not dead-lock or alarm (second press of fob is not recognised). I can reset the fault by removing the key, opening and closing the driver's door, fully locking (2 presses) and unlocking the car, then reinserting the key and staring the engine. Does anyone know of a connection between the body control units (door locks & ultrasonic sensors) and ECU which would cause both to fault simultaneously?

    The garage have not yet identified a definite fault but are preparing to quote me for a replacement air sensor. I don't want to do that without a proper diagnosis but I might have to take it because the car is pretty well unusable, arguably dangerous in its current condition. However I am very open to suggestions if anyone has a better idea.

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    Hi
    I had a problem fairly similar to this recently and my local vaux garage were baffled by it.
    The spanner symbol, if it is going through a car is your safe mode which basically allows you to limp home without further damage and it is a pain in the arse but it may be worth taking you boost pressure sensor out your inlet manifold and make sure its not clogged, if it is give it a clean or replace it. Well thats what was wrong with mine and after that it hasnt been a problem.
    Just a thought hope it helps!

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    Vehicle : Opel Signum

    Trim : Sport

    Engine : 3.0 CDTI

    Year : 12/03

    Default

    Don't know if it helps but I had a similar problem on a 2.2DTi. Under smooth acceleration the spanner light popped on and no power...accelerating harder didn't really make any difference as the spanner light came on even quicker...
    Boost hoses were K.O.

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    Me too! If I accelerate my 2.2Dti on an incline and there's a bit of torque, sometimes spanner light comes on and engine goes into limp mode. Only solution is to stop and turn off to reset.

    My guess is that its something to do with the turbo and a sensor fault, but I never bothered to do mine as they wanted to charge too much.

    Simon

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    Boost pressure sensor is favourite.Had similar problem with mine-accelerate,back off then limp mode.

    Just remove the boost sensor from the inlet manifold (back,right under lots of other stuff) and squirt some carb cleaner or similar into small hole on sensor.

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    Thanks everyone. Vauxhall garage have not got back to me with a quote.

    Meanwhile I threw a quarter can of carb cleaner into it - it blew some smoke but has been fine since, even under modest provocation. But the weather has been warmer and drier so I don't know if I have actually fixed anything. It had been especially bad on cold wet mornings. Maybe I just need to SORN it in bad weather! Pity, because on a good day it's a fantastic car - Neighbour has a 2.0 petrol turbo and envies my fuel consumption, my father has the 2.2 Diesel and laughs heartily at my fuel consumption.

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