Finally after going through this site and its links i have found the problem. it seems the old ls 400 has a common problem with this ticking noise coming from the 5th and 7th cylinder. looks like the valves stick, small cap under the shims gets stuck, the description of the fault matches mine exactly, looks like getting the shims done has popped this cap back out but it has depressed after 10 mins, the shims now being set to the smallest factory setting gap seems to have made the ticking noise louder. I cant describe my disgust at my local lexus dealer, they knew this and went on a money making exercise, just wait till monday morning.
See how much is charged to remove the cylinder head , probably repair the head and fit a couple of valves...not a lot if i get my own way.
Anyway as that should fix this problem does anyone know how to refocus the laser on the old cdx-m97512zt, went off last year, or were to send the unit to to be repaired, rather do it myself have most of the tools to do the job, just got to find the cap to adjust laser beam, bit embarrasing for me cos i am in the laser industry but a bit higher power than this
Also does anyone know how to cure a sticky speedometer, awful when cold, doesnt move some morning till warmed up, seems like a loose wire, i have heard they have problems with the back light pcb burning out...would this really cause this problem, feels as i say a loose wire or perhaps adry solder joint, any help again appreciated.