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[Boracic]

I don't know how long the plugs have been in on the 2/4/6 bank, could be the original plugs, its gone 88k miles, I've got both coil packs on order and will be changing the plugs and coil packs tomorrow, I hope this fixes it or I'll have no idea what to do next, lol

[Boracic]

Just an update on my car, plug 4 is totally dead and was loose, soot all over the coil pack, good news is the wells are all dry, all 4 prongs and the bit in the middle of the plug are gone, never seen a plug this bad

[albitz]

Hopefully got blown out the exhaust port.

[Boracic]

Yeah lets hope so, lol

[Boracic]

I think it was time I changed this plug!

[omega3000]

  yes its best to change that 

[Kevin Wood]

If the car's done 88K that shows how sensible GM's 80K service interval for the plugs is.

I guess, if it's been rattling loose in the head, shock might have done some of the damage, but still.. They clearly work loose in 80K regardless of their condition.

[Boracic]

I'm not sure if they were the original plugs or not, to be honest the other 5 look hardly used, I just hope all the missing bits burnt off rather than fell in the cylinder, its all back together now with new plugs and coil packs and seems fine, I hope it stays that way

[jonny2112]

If you don't mind me asking, how much did you end up paying for the coil packs?

[Boracic]

£75 each, made by Bosch

[jonny2112]

Cheers pal. Just in case I need to go down that route 

[amba]

Is there anyway of finding out which cylinder is not firing on a MFL as I have just noticed slight missfire too.....plugs 10k..leads 2nd hand replaced 10k ago...dispack Bosch replaced around 30k.

Only just started but definite misfire..sorry to hijack post but OP seems to have answer and topic related.

[Boracic]

Have a look at this
http://www.omegaowners.com/forum/index.php?topic=90581.0

[amba]

Thanks for link but paperclip test won,t provide an ignition fault as it won,t be a stored code.

Just curious if there was a simple means of establishing which cylinder is misfiring as to get at most of the plugs you need to dismantle enough to stop the engine from being able to run.