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Thread: CDTi turns over but wont fire

  1. #1
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    Default CDTi turns over but wont fire

    I have an 05 plate 1.9 cdti which has run perfectly for months.

    The last few days have been different though.

    In a morning it turns over no problem but fails to fire. I have tried leaving the ignition on longer, pumping the accelerator pedal, charging the battery.

    It does eventually start and runs perfectly when it does, starting easily for the rest of the day. The following morning, same problem.

    I am going to replace the diesel filter today as that has been mentioned to me.

    Also there are no fault codes present.

    Any help would be much appreciated.

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    Just to add some more information:- This morning when I finally got it started I have an emissions warning light on.
    Turned it off and back on several times and the warning light is still on.

    When it started I got white smoke from the exhaust.

    Glow plugs? EGR?

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    My money is on the glow plugs. White smoke is unburnt diesel.

    My missus has a 1.9CDTi 140. One day while I was working on it, I forgot to re-attach the leads to two of the glow plugs. The following morning, it simply would not fire up at all. Spent about 30 minutes looking for things to check. Then noticed the two leads and re-connected them back to the glow plugs, and it fired up in an instant

  4. #4
    Regular Member stevie16v's Avatar
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    If it's just above freezing point like it is here then you will still get white smoke, its dampness in the exhaust and normal. Plugs tho, are a good place to start, don't pump the accelerator, that was for carb driven vehicles run by cables and is well outdated now

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    Cheers for the replies. Goint to do a quick check on the wiring then off to buy some glow plugs.

    Then see what happens

    Have lost the emissions warning light now after driving a couple of miles.

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    Quote Originally Posted by Malcste View Post
    Cheers for the replies. Goint to do a quick check on the wiring then off to buy some glow plugs.

    Then see what happens

    Have lost the emissions warning light now after driving a couple of miles.
    If you lose the warning light after a couple of miles, it's almost certainly the glow plugs

    As above, shouldn't need to touch the accelerator to start any modern car, petrol or diesel.


    ---Sent from my iPhone 4 using Tapatalk

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    Regular Member stevie16v's Avatar
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    be very careful changing the plugs, they can strip very easily. I tend to go for one turn out, 1/2 turn in, don't be tempted to just wrench them off

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