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[jonny2112]

Aux belt off. No change on startup. Back to basics then.
Next step, strip back down to inlets. What exactly is the 'intake manifold valve'?

[jonny2112]

No apparent blockages etc in manifold. Sandwich plate clear too, so back on.

[jonny2112]

Inlet manifold ok too so back on. Connector plugged in, and the thin vacuum hose still attached.

[jonny2112]

All back together, and plenum back on. Still no change on start up, and same codes on pedal trick.
What now? I'm lost 

[tunnie]

Hummm, so with Aux belt off no change. That rules out anything sitting in the pump, also with no coolant circulating it means no problems there.

Also when you rotated the crank by hand all was well? 

[05omegav6]

That small pipe the runs from the throttle body UNDER the plenum connects to the fuel pressure regulator on the fuel rail. Not sure what would happen if disconnected though

No offence intended, but playing devils advocate, you did refill the coolant didn't you?

[jonny2112]

Yes tunnie, all seemed well.
And al, coolant was topped up but not circulated yet as I don't want to run the engine whilst making the racket (hardly linked ?) Oh, and no offence at all 

[05omegav6]

They can get quite noisy if run for a bit without coolant

Mine was knocking like a bastid from driving 1/2 mile to get off the motorway when I broke it last year

[jonny2112]

Maybe I should try running it for a bit then to try and get the coolant in.

[amba]

If water pump turns freely by hand very doudtfull anything is stuck in the impellers.

Cant see a noise being caused by a vacuum pipe being left off so think I would agree with Al ,and just let it run for a while on idle and see if it clears as could be possibly coolant not circulating or maybe even low pressure of fuel getting to the injectors after being disconnected.

[jonny2112]

Ok.
Was letting it run a bit, but got steam / smoke from offside bank. Might be excess oil or water burning off, but I've switched off for a minute to check. Opened the rad drain and a little fluid came out so at least coolant starting to circulate.

[Entwood]

Ok.
Was letting it run a bit, but got steam / smoke from offside bank. Might be excess oil or water burning off, but I've switched off for a minute to check. Opened the rad drain and a little fluid came out so at least coolant starting to circulate.

This worries me .... with all the drains closed, as you pour coolant in you should get 90% of it in with ease, and radiator should certainly be full, you may have the odd airlock in the heater matrix .. but the rest of the coolant system should be pretty much full .....

Always has done this on mine anyway ......

[05omegav6]

Agreed, should be pouring out when the drain screw is undone

[albitz]

Its difficult without being able to hear the sound. It could be that you ve left something lie a bolt or socket in the area of the cams and then put he covers back on,so it now acts like a spanner in a tumble dryer.On the other hand it could be lifters and cams needing a bit more time to get oil back where it should be.

[jonny2112]

I probably didn't explain that very well 
I only initially drained what came out when the valve was opened, not the block. All I meant was that when I again opened the valve fluid started to come out, whereas it had previously been drained. It does pour out though. Sorry for misleading.
I've taken a video and ill try to upload to YouTube so you can hear it, in case that may help?