I have sometimes this problem:


The engine coughs for a long time before starting ...

I don't understand why, because, sometimes, with the same cold weather and cold engine, it starts very fast. How can that starting time vary so much ?

  • Are you allowing the glow plugs to warm the combustion chambers prior to try to start it? Jan 29, 2014 at 12:21
  • @Paulster2 : Yes I do... Jan 30, 2014 at 0:23

1 Answer 1


The problem could be that the glow plug relay is going out. If it is intermittent, the glow plugs will heat sometimes and other times not. I don't know if this is a known issue with BMW diesels, but it is plausible this is your issue.

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .