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Thread: huge current draw whilst on regenerate

  1. #1
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    Vehicle : Vectra

    Trim : SRi

    Engine : 1.9 CDTi 150

    Year : 06

    Mileage : 250,000

    Default huge current draw whilst on regenerate

    I have noticed recently that whilst generating the voltage drops down as low as 9.2v!! this means i lose power steering, abs, lights go dim and the radio.
    under normal running the alternator puts out 14.2 constantly according to the info i can get via testmode on the stereo, this has been backed up with a hand held multi meter as well.

    why is there such a massive current draw? i have just had a new alternator fitted because we believed this was the issue.

    the car is an 06 Sri 1.9 150 cdti auto, it has done about 205,000 miles and this is one of tow few issues i have, however it is getting dangerous, especially when the power steering packs up.

    and suggestions gratefully received

  2. #2
    Regular Member simon7257's Avatar
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    Have you checked that's it's not just your alternator failing under load?
    Start the car and switch everything off (lights, blowers etc) check the voltage at the battery using a multimeter, hopefully it will be about 14.5 volts then switch headlight on heaters on maximum speed and the heated rear screen on and recheck the voltage, it will drop a little but you don't want it dropping too far

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    Regular Member simon7257's Avatar
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    Have you checked that's it's not just your alternator failing under load?
    Start the car and switch everything off (lights, blowers etc) check the voltage at the battery using a multimeter, hopefully it will be about 14.5 volts then switch headlight on heaters on maximum speed and the heated rear screen on and recheck the voltage, it will drop a little but you don't want it dropping too far

  4. #4
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    Vehicle : Vectra

    Trim : SRi

    Engine : 1.9 CDTi 150

    Year : 06

    Mileage : 250,000

    Default

    yes we have tried the voltage drop, the alternator handles that without any issue, it holds between 14.2 and 14.4, its only when it regens does it drop.
    If the car is running and the regen is taking place the voltage varies between 12v and 13.5, if it is idling then it plummets to 9.5v and everything dies.

    All of this would not really be an issue but the car is a Taxi and so regens almost daily, some of the time when it regens it is in town and holding a fast idle with people on board is not ideal......plus the car really pumps blue smoke out of the exhaust as well!!!!

    Nothing else seems to create such a voltage drop like this does.....immediately after the regen has finished if i switch off the engine and restart it is very slow to turn over, like the battery has been drained, give it about an hour of running round and the battery appears to be back to normal.

    Both that battery and alternator have been changed on the last 6 months for various other reasons, this is a new 'issue' to add to the growing list

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    Vehicle : Vectra

    Trim : SRi

    Engine : 1.9 CDTi 150

    Year : 06

    Mileage : 250,000

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    double post........

  6. #6
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    Will it not be a good idea to get rid of the DPF and map it out?
    Last edited by tony-1977; 20th March 2012 at 21:48.

  7. #7
    Regular Member lee gsi's Avatar
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    I thought a regen just added more fuel and didnt do anything electrical?

  8. #8
    Regular Member barney490's Avatar
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    Quote Originally Posted by tony-1977 View Post
    Will it not be a good idea to get rid of the DPF and map it out?

    As this car is being used as a taxi, this is a very good idea. In the long run the cost of removing the dpf and remapping will pale into insignificance, compared to the cost of the extra fuel many regens will use. dpf equipped cars and mainly round town work really don't mix.

    I have not heard of a regen ever causing syptoms such as this. There really is no electrical involvement when regen is taking place, yes the injection timing is altered to put more fuel through the system, to get the dpf hot enough to burn off the soot, and at idle the revs can vary a little. My only thought is that maybe the dpf temp sensor is shorting out, as it only comes into play when a regen is occuring. Having said that, a regen really doesn't do it's job correctly, unless the car is run at more than 2000 rpm for the 10 to 20 mins regen normally takes. Best advice is as tony suggests, have it mapped out.

  9. #9
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    Vehicle : Vectra

    Trim : SRi

    Engine : 1.9 CDTi 150

    Year : 06

    Mileage : 250,000

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    thanks for the comments.....the DPF and remap is something i have considered.

    Does anyone know of someone in the Plymouth/Exeter area who could do this job reliably?

  10. #10
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    Vehicle : Vectra

    Trim : SRi

    Engine : 1.9 CDTi 150

    Year : 06

    Mileage : 250,000

    Default

    Double post....again

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