Eric,
I believe it is for the same reason that a cold engine needs a richer mixture -
the mixture
is harder to ignite inside "cold" engine. Pinging(pinking) is caused by
pre-iginition of
the air/fuel mixture -- that is the mixture catched fire before the spark plug
would
otherwise ignite it.
--
Henry D. Reynolds - System Admin
mail: hdr@jump.net - phone: 512.448.3617 - cell: 512.699.8658
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