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Audi A6 smokes in cold weather

My 2004 Audi A6 2.5 TDI (120k miles) smokes big-time on starting in winter. Is this normal?

Asked on 27 January 2012 by RCP

Answered by Honest John
No. Overfuelling for the cold start, but by too much. Could be some of the glowplugs are not working.
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