My octavia has/had a strange metal to metal banging noise from engine bay.

It feels as if the car is running on 2 cylinders and the noise sounds like big ends. This noise was only happening for the first twenty seconds when starting, then it would go away.

It then done it permanently, so I thought engine goosed (it's done 235000 miles lol)

I started it up tonight to move it, and the noise started for 10 seconds then disappeared ???????? I then took it out, and played hard with it, and it drive fine.

Obviously can't be big ends, I'm stumped to what it could be . It seems to blow a bit of black reek, but unsure if this is down to the noise, or just the mileage.

Could the egr cause this ?

I don't think it's the turbo, or the flywheel.

Any help or guesses appreciated.

Edited 20 September, 201510 yr by derek666

alternator clutch ?

No, don't think so, it's too intense.

I'm turning a little to the turbo, but that was only replaced a few thousand miles ago, and it is really a loud metal to metal knock, If you hold one of the air hoses, you can feel the vibration right through the engine.

It done it again tonight, started it up, noise for around 10 seconds, then it cleared.