Hi Crab,
Funny how the cure seems to be for different reasons, I was told that the water cooled the thermocouples which seemed to lead to a change in fuel flow.
It is academic as the Fire Crew at Shoreham Airport who gave me a bucket of water to throw down the exhaust pipe thought that the Wessex was steam driven, not far wrong I guess.
Heads down, look out for the flak.