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911nut 911nut is offline
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Join Date: May 2001
Location: Michigan
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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.
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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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