'All Astras sound like that....'

[Sparkie]

Ok, I attempted to get a video of the sound. It seems to be coming from the drivers side of the engine bay, probably towards the front. Any clues?

https://www.youtube.com/watch?v=kOHkn4KW68A
and
https://www.youtube.com/watch?v=mD4URRjKz1k

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[guy 27]

tighten your exhaust manifold.

Don't over do the nuts otherwise you will snap a stud off.

Exhaust Manifold with turbocharger to cylinder head 8nm

[Sparkie]

Thanks again guy, appreciate your time. I'll give that a go in the morning and see how I go.

[guy 27]

no problem.

Also your injectors are a bit on the noisey side but that is nothing to worry about.

[Sparkie]

Ok. I'll google up about the injectors.
But I'll try not to worry

[Sparkie]

Righteo. Eventually got to the manifold and tightened the bolts. Only two moved and only by a mill or so, and the noise remains. I pulled of the auxiliary belt and started it and the noise is still there, so I think I've ruled out pulleys etc on the crank shaft, a/c etc. I pulled the top cover off the timing belt and the noise seems to be coming from the two camshaft cogs at the top. The front one in particular spins pretty wobbly but seems on tight. But it could just be referred noise from lower down in the timing belt area. I haven't pulled the bottom cover of that yet. I guess thats next, but its probably beyond me to do a timing belt. The belt is in good nick. Not sure where to from here

[Arkos]

Been quite busy lately. Just wanted to thank you for letting me know what is the problem with the car.