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Metal Guru
Join Date: May 2001
Location: Beverly Hills, Michigan
Posts: 2,526
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If I drive my car, shut it off for a while and then start it up, my afr will be 15/1 to 17/1 at idle. This is because the bi-metallic lever in the wur moves during/after heat soak to lean out the setting. Idle drops 200 rpm so it's a nuisance, especially with the a/c on. When driving with the engine at constant speed, my afr is 14.5/1. The cool fuel passing through the wur cools the wur off and the idle wur returns to 14 to 14.5/1 eventually.
I've never had the afr steadily increase during constant speed. I'm thinking Flightlead may have a wur issue.
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Paul B.
'91 964 3.3 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, H&R Coilovers, ESB spring plates- 210 lb
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