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Not sure about modern computer controlled engines at idle, but I'd think you'd get enrichment to a greater degree than cruising at 2000 rpm until warm.
The trouble this causes can be to have unburned gas wash oil from cylinder walls.
I do know my 914-6's Webers idle circuits dump fuel initially, and I'd never let it idle for more than about 30 seconds. Same as I do for the Box.
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Mike
04 Boxster S - Basalt/Savanna, 6sp, Carrera lites, hardtop
70 914-6 - Black over tan, original/stock
PCA since 1970
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