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[jonny2112]

Listening to the sountrack several more times,my uneducated conclusion would be,no oil up around the cams or dried out lifters.
Run it again briefly,then whip off a cover and look for signs of oil or lack of it around cams ?
If no signs of oil,find out why ?

Will do, cheers 

[JamesV6CDX]

If you get really stuck, I should have a set of restdays coming up, could see what Sleazyjet have to offer....

[jonny2112]

Cheers James 

[RobG]

How long have you let the engine idle for John

[jonny2112]

Maybe ten minutes Rob, certainly not much more. Am thinking that I'll have to let it run up to temp at some point though .....

[RobG]

Maybe ten minutes Rob, certainly not much more. Am thinking that I'll have to let it run up to temp at some point though .....

If all or some of the lifters have drained themselves you can triple that

[05omegav6]

Chuck a can of lifter treatment in and take it for a gentle drive, try and keep it below 2000rpm if you can

[albitz]

Probably good advice,but I would want to double check that oil is getting up around the cams etc. first.

[jonny2112]

Probably good advice,but I would want to double check that oil is getting up around the cams etc. first.

Planning on testing it in this way tomorrow afternoon. If all goes well, then we can go for the long idle, or perhaps the run. 

[05omegav6]

Remove the oil cap whilst running, should be some oil splatter evident, don't go sticking your fingers in though
Could also remove oil filler tube, if oil is visibly evident then probably ok

As an aside, if the oil pump is a bit on the lazy side, then just idling the car will do alot more harm than a gentle drive

[jonny2112]

Could also remove oil filler tube, if oil is visibly evident then probably ok

Funny, I was thinking about that, to avoid having to remove the near side cover 

[05omegav6]

As said if evidence of oil there, then take it for a quick run to warm it through properly and report back

[jonny2112]

Cheers al, will do. Back tomorrow afternoon 

[jonny2112]

Update -

Right. Let the motor run for about twenty minutes before I had to nip out (in the wife's car obviously  ) and then another twenty minutes when I got back. I did think that it sounded quieter, but not sure.
Decided to take it for a run, but it was horrible to drive. Not the smooth luxury gem that it was, before I got the tools out!
Was missing a little, down on power, and the throttle was really strange.
Got home again after only a ten minute run, and remembered to do the pedal trick. Extra codes now -
Existing -
0120 Throttle/pedalPosition sensor/switch "A" circuit range/performanceProblem
0220 Throttle/pedalPosition sensor/switch "B" circuit range/performanceProblem
1110 Intake Manifold Valve 1 Open
1111 Intake Manifold Valve 2 Open
1700 Service Vehicle Soon Request from Transmission Control Module
New -
P0325 Knock sensor 1 circuit high input (Bank 1 or single sensor) or  Knock sensor 1 circuit low input (Bank 1 or single sensor)
P0330 Knock sensor 2 circuit high input (Bank 2) or Knock sensor 2 circuit low input (Bank 2
0300 Random/multiple cylinder misfire detected
0301 Cylinder 1 Misfire Detected
0304 Cylinder 4 Misfire Detected

So instead of getting better, we're getting worse 

Definitely something wrong with the throttle so that ties in with the codes, as does the misfire; though why one on opposite banks? Knock sensor?

Sorry guys but here we go again! 

Also, eml came on for a short time on two occasions during the drive.

[jonny2112]

2) The knock sensor is a VERY reliable device and not one that I have ever known to truly fail. I have however seen them on V6 power plants where the cable has been trapped and damaged under the cam covers following gasket replacement (passenger side) or caught in the aux belt (drivers side).

Oh sugar! That could be my fault then when reassembling. I checked round the covers though and didn't think there was anything trapped, and surely a bit coincidental that both are playing up? Albeit I did both cam covers .........