Sounds to me that the glow plugs are either not working or not staying on long enough. My Ford F-250 diesel truck has a glow plug relay that does not allow the glow plugs to stay on long enough and it blows white smoke during difficult starts. I turn off the ignition and make glow plug contact several times (turning the ignition switch off and on several times in a row) to start this truck in cold weather and it blows the white smoke until it starts.
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1985 740 GLE
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