Metallic engine noise - problems starting

[sgrech]

Hello,

Bought an Audi A3 Sportsback 1.4 TSFI 6 months ago

Quite shortly after my purchase my engine started to make a noise very similar to this on a regular basis


1.4 TSI Start noise. - YouTube (https://youtu.be/4AJAzaQKMT4)

As far as I can recall it tends to happen more when the car is cold. It normally lasts no longer than a second or two.
Also it sometimes fail to start first time very occasionally, perhaps every two or three weeks on average - maybe not even that. However today according to my missus it took four attempts.
I am becoming increasingly worried.
Any ideas, sounds like I need to take it to a Audi technician?
Any thoughts would be greatly appreciated.
Simon

[Crasher]

The timing chain is stretched/worn and needs replacing, this is often the result of leaving oil changes too long, how many miles and oil changes?

[sgrech]

The timing chain is stretched/worn and needs replacing, this is often the result of leaving oil changes too long, how many miles and oil changes?

I guess that might explain the noise but would it also affect the ability of the car to start? I fully serviced the car when I bought it. I believe it had three oil changes prior so that 4 in 36k miles.

[Crasher]

It can cause a correlation error between the camshaft and crankshaft sensors (G40 and G28 respectively) which makes the engine take longer to start as the ECU is struggling to tell where number 1 cylinder is to initiate injection.

[s11nny]

looks like the timing chain tensioner, common fault on all tfsi engines.