Hollow noise on start up only when cold (video)

kevbu

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Hi all, wonder if you could run a collective ear over this video i shot this morning.

A4 tdi noisey cold start - YouTube

It only does it when cold 1*c or less, its a strange noise, just wondering if anyone has similar experience.

It starts with a rattle, then a metallic hollow sound (like draining the dregs of a milkshake through a straw) sometimes a little longer than this one, then its gone.
Its done it before and after fresh oil and filter service.

My first thought was something to do with the starter motor not disconnecting, but why only when cold weather?
 
could be the starter gear sticking

the grease could be going hard
 
Thanks for reply. That was my first thought.
Also had a few dead key then catching moments, I'm now thinking solenoid?
 
defo sounds like starter to me that happened to mine and it just got worse really quickly