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911nut 911nut is offline
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Join Date: May 2001
Location: Michigan
Posts: 2,511
Mine does the same until the upper end cools off.
The LM-1 shows a mixture of 16.5-17.0:1 during the episode.
I believe it's related to an interaction between the diaphragm in the fuel head and the temp rise with the end result being a lowering of the pressure drop in the individual chambers which reduces fuel delivery.
Once enough cool fuel passes through the fuel head the idle and afr return to normal.
Paul B.
'91 964 Turbo
Port matched, SC cams, K27/K29 turbo, Roush Performance custom headers w/Tial MV-S dual wastegates, Rarlyl8 muffler, LWFW, GT2 clutch & PP, BL wur, factory RS shifter, RS mounts, FVD timing mod, Big Reds, - 210 lb
Old 10-10-2011, 05:07 AM
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