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[05omegav6]

I think it must be faulty. Knew I shouldn't trust it.

Miss2112 has uploaded the noise .....

http://www.youtube.com/watch?v=lmzZ3V5-VYg

Hope the link works, as it'll give you an idea.

In no particular order:

Plugs all tight.
Inlet manifold/Plenum/Intake Bridge all bolted down.

What oil did you use? If used to 10w40 and a bit of mileage, then 10w30 is a bit thin IME Pop a can of Wynns Hydraulic lifter treatment in. That will help with the tappety noise

Don't bother running it with one or tother coilpack unplugged. All this will do is really piss the ecu off giving you a shed load of codes to worry about on top of everything else. I doubt it is even a cylinder down from the sound and total lack of vibration.

[05omegav6]

Just occured to me

Are the half moons all seated correctly at the back of the cam covers? If not that will allow alot of mechanical noise out of the heads

[albitz]

And a hell of a lot of oil I would have thought.

[Kevin Wood]

Sounds to me like that's running on all 6 alright, but with no oil supply to the hydraulic tappets.

Certainly doesn't sound like a foreign object has got anywhere IMHO.

Is the oil light going out?

Does it quieten if you lift the revs to say 2000 RPM?

Struggling to see how it can be related to a cam cover change, I must say. Were the T vents disturbed? Guessing not.

.. unless overtightening the cam cover bolts has damaged the cam caps?

[JamesV6CDX]

.. unless overtightening the cam cover bolts has damaged the cam caps?

Hope to goodness not... as it will more than likely need new heads if that's the case

Sadly I can't see/hear the clip, as my internet connection is so pants at home. BUT I once had a car on my drive, I drained it of oil, did the cam covers, oil cooler kit, cambelt, and other work.

Everything was done perfectly, nothing dropped or unaccounted for... yet on startup, it made the most awful tapping noise I've ever heard.

I went belt and braces, I took it apart again to check everything - and found it to be fine.

Again fired it up, really, really tappy.

It was not until it was fully up to temp, and had idled for a further half hour, before it shut up, and sounded sweet again.

As part of my process I checked the sump, pickup strainer, T vents, all clear as a whistle...

Admittedly turning the engine by hand a few times doing the cambelt would have drained the lifters of oil somewhat, needing more time for them to prime.. but still.... I just had to put it down to one of those things...

It may for peace of mind be worth a check of the strainer and oil pressure.... but it may be another one of those that just disappears and doesn't return...

[05omegav6]

And a hell of a lot of oil I would have thought.

Possibly, but OP makes no mention of neither revving the engine nor actually driving it  at idle just how much oil pressure is there at the top of the engine

If all that has been done is a camcover gasket and thermostat change, the it should be a case of working through both jobs until the thing that isn't quite right is found and rectified

[Kevin Wood]

Yep, if you get air in the lifters they do seem to take ages to quieten down on these engines, but I've never had one rattle like that after just routine servicing.

[05omegav6]

A combination of loose plugs and thin oil make for an interesting soundtrack especially when cold

The loose plug being most of the reason that mine destroyed one

[jonny2112]

Thanks guys.
Plugs all checked and refitted without any problem.
Left it running earlier for maybe ten minutes but no more, and haven't driven it yet. Temp had started to rise so hopefully stat is working.
I'm hoping that any problem with stat or transfer pipe would result in a coolant leak somewhere. So far there is not. Everything else has been redone - inlets and camcovers - but still nothing seemed out of place.
Maybe I'll take it for a run tomorrow evening and see what happens. Scared of it going 'bang' though 

[tunnie]

Only just watched the video, had a "few" beers last night 

As others have said, does not sound like a miss-fire to me either, its also a very deep sound 

As Kevin mentioned, what happens with a very small amount of revs?

Oil light going out?

Even if the cam cover was done to 1,000,000 Nm, surely that would have just stripped the thread/cracked bolt? Its a tiny bolt too would have to go some to damage a cam cap? 

If you listen closer, is the sound coming from both banks?

[jonny2112]

Haven't really tried revs but can't say I noticed any difference on the one occasion. I'll confirm that later, and may also take it for a spin.
No warning lights at all once started.
Sounds like its coming from the plenum actually, though hard to say - could be both banks instead.
I had removed it and cleaned breathers and throttle bodies, and there's nothing else in there to cause any issues. I'm going to take it off and check though.

[tunnie]

Have you tried pushing down on the plenum, on one side or one corner while its running?

[TheBoy]

Why have I just had a dejv vu moment,, has the Matrix just rebooted

In my case, it was a combo of lifters going noisy coincidentally, and the EGR (yours won't have one) which was something we touched.

If the lifters have lost their oil (esp if they are getting on, and springs are weak), they take forever to pump back up.

[jonny2112]

Have you tried pushing down on the plenum, on one side or one corner while its running?

Yes but to no avail. Nothing apparently loose there, on the outside anyway.

Ah, the Matrix ...... Maybe this is just a 'glitch' 

I'm going to take the plenum off (again!!) and just check it for anything out of the ordinary.
Guess I will just have to take it for a run, even if its only to rule that out.

[Elite Pete]

That doesn,t sound like anything metalic has dropped inside the negine to me.

Have you checked the small rubber hose join on the SAI tube that runs just by the o/s coolant transfer pipe for a split...that noise sounds more like manifold or exhaust related from the clip

2.6 doesn't have them