My wifes Omega is playing up a bit - check engine light been coming on intermittingly for a while with seemingly no adverse affect. Car is a 2000 X plate 2.2 auto. Recently though it has started to miss-fire and is sometimes sluggish  - down on power. Got 68k on the clock and has full service record (last one by me)
Checked battery at tick-over last night and there is just over 14 volts going in - is this normal? No charge lights on and everything works.
Looks like it will need to go in to dealer for the dreaded Vauxhall diagnostic check . My local garage have some software but its not up to date for the Omega and they couldn't find anything conclusive. Anything a reasonably competent home mechanic could look at over the weekend?

Also check for oil/water in the plug wells....

When 'playing up' does it rev past 4000 or is there a rev limit?

I'm in Glasgow so too far away for the chap with Tech II - know anyone with Tech II up-here?

I have the car and it does rev past 4000 - it's an intermittent fault which is bloody annoying as I know it will be tricky to trace. Yesterday, my wife pulled out on the M8 to pass a bus and she had no power  - bit disconcerting at motorway speed. She now won't drive it until I get it fixed

Try getting a low-cost engine fault reader - they vary in price from £40 for a PC-based unit to upward of £100 for a standalone one?

Otherwise if you can get hold of the following and replace on trial and error basis:

2.2 DIS P/N 9195819

Had intermittant loss of power on wifey's Astra which turned out to be the coil pack but this doesnt usually put the eml on because the fault is in the secondary windings and only the primaries are monitored by the ecu ( or can the later s/w detect misfire by listening to the knock sensor??    TB ? )

If eml has been on then there should be fault codes stored, get these read and cleared. If there is just one stored then work from there, if several these could be old problems so you will have to wait for the light to come on again and get it re-read to find out the current problem.

Its a 2000 X reg 2.2 ecotek. The picture that Omega Knight is showing is the coil pack/plug leads on the car - I know because I changed plugs a few months ago. I assume this set up is coil per plug so if playing up, CEL will light up due to knock sensor? I will still get the codes read by Vauxhall but its nice to go in armed with some info when they try and b******t you in to replacing all the sensors and ignition circuitry and components to cure the miss-fire.

Is there any way to clear faults from ECU memory before I take it in?

there is yet to be a guide on a coil pack change, but on the 2.2 there is plenty of space to do it.

Depends how good you are with some spanners? As pointed out give the breather & throttle body a good clean, beacuse even though the millage is low it will still be dirty.

Btw Omega Knight is the name give to members with over 1,000 posts - markjay gave you the picture on the coil pack