Re: 156 V6 running v.rough
As the original poster of this thread, I thought I'd let you know what I found on my 156....
After a fun (!) saturday afternoon removing all engine gubbins to allow access to the spark plugs and coils I found that all 6 plug bores were wet to varying degrees. All were very damp, and cylinders 3 & 6 were absolutely soaking.
Obviously a candidate for the symptoms I was having.
Gave it all a good clean up, and left things to dry out overnight. Now it is all back together again and so far she seems to be back to normal. Hopefully that is the way she'll stay.
How did all that water get up inside there?
We have had some peculiar hot/cold weather recently and the car was stood unused outside for over a week so it could have been condensation forming on the heads and then finding its way to the lowest point on the engine.
The engine bay may heve got wet recently when I knocked the undertray off (again) and this time it may have been scooping water/spray up and into the engine bay until I managed to fix it back up again.
Bit of preventatiove maintenance (especially as they are such a pig to get to) - I noticed that the low tension wires feeding coil 1 were starting to wear through by rubbing on their locating/routing casting on the head. The outer sheath was long-gone and the individual wires were showing signs of scuffing, so all protected by new electrical tape.
Many Thanks for your help.