Originally Posted by SomeRandomer123
Exactly the same symptoms for me but it turned out to be my glow plug control unit.
That's what I thought my problem was too... Either a glow plug or the control unit.
Anyway, I'm removing my swirl flaps in the next few days. Shouldn't cost me more than £50 for the job and it's the only guarantee that it won't happen again.
Just for the record, it's a European 2009 E90 LCI 330d Steptronic.