"C J Campbell" wrote in message
...

" jls" wrote in message
You just
completed a descent with the mixture full rich and the engine idling --
lots
of cooling and plenty of opportunity for spark plug buildup.

A good reason to to enrichen the mixture on descent and landing. I always
go as lean as I can.


I suspect that
the detonation and premature ignition that result from your
recommendations
are even harder on an engine than occasionally clearing a spark plug.

No doubt!