Hi please help my vectra 1.9 cdti 120bhp has started after about 10 mins of driving blowing out white smoke which has now turning a bit blue . I have no loss of power and if i turn off ignition and then straight back on it clears but then comes back after about 10 mins .when smoking it smells of unburnt diesel and mpg drops to about 20 .have put on fault code machine and no fault found
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