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[polilara]

So, this time codes 300, 302, 304, 306, rough sometimes, perhaps coilpack to be changed. When clearing codes yesterday found ECU voltage only 11.2V while battery around 14 as charging is ok. Ground connectors in frame below battery are green and white, very corroded. They might not cause this 2-4-6 problem.

Should ECU Voltage be same as Bat Voltage?
Where to order Coilpacks from and which trades are recommendable, Bosch, Beru...? Found from Autodoc several possibilities.

[addy]

Try simple thing first. Clean all the earth leads and the contact, under the battery.  Poor earth connections, can cause all sorts of problems.

[polilara]

Sure, I take care of the earthing. However, it was time to change spark plugs so I found wells 4 and 6 full of oil. Wells 1, 3, 5 and 2 were dry. I took cam cover away and will change gasget soon. Cover not warped. Aluminium cover preferred if someone have those avaolable. Ordered also coil pack 246 and found leaking HBV so good to be there sometimes...

[addy]

Oil in the plug wells, will give missfire problems. Hopefully once you have done all the work. You will have a nice running car again. I would do the gasket on both sides, seen as you are already there. Saves having to do the work again, later on. Good luck.

[Doctor Gollum]

Which basically what was said when the intermittent misfire first popped up. Might have saved the coil pack if it had been addressed straight away.

And only a total imbecile would change just one cam cover gasket on the VX V6... You have to remove the whole inlet gubbins to get the cam covers off.

And metal camcovers will lead to blowing out the crank seals in time.  Preventative maintenance such as annual breather cleans and decent oil (not Castrol) changed regularly pays for itself in the long run.

[polilara]

This starts to be too difficult for me, please help!:
2-4-6 (bank 2) camcover seal changed. New Bosch Coilpack installed. All six plugs changed, original.
Starts perfectly runs  perfectly 150km/h and idles well when cold. When getting warm still runs perfectly but has rough idling and engine light blinking. Get codes 130 and 150. After codes cleared no codes after driving when engine immediately stopped. But if let idling after a couple of seconds rough idling, blinking engine light and codes 130 and 150. If let it idle 3 minutes also misfire 2-4-6, 302 304 306. What is going on? MAF? Difficult to think that bank 1 and bank 2 first O2 sensors  fault at the same time.
Furthermore, when rough idling and engine light blinking when I put in neutral 3000rpm the engine light stops blinking, goes off. MAF? Please help. Can get live data, I remember B1S1 and B2S1 are more or less frozen when idling rough.

[Doctor Gollum]

Consider that the sensors might actually be working correctly.

Any evidence of overfuelling 

Air filter clean? Multirams working correctly?

Unplug the MAF and run it... does it still misbehave?

[polilara]

Thanks DG, I report after fortnight, now far away from the Omega.

[polilara]

When idling roughly unplugging MAF does not change situation. Have to check. trims and others live data