Thread: Odd AFR issue
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RarlyL8 RarlyL8 is offline
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Join Date: Jan 2000
Location: Huntsville, AL
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Idle mixture.
It is not uncommon to adjust idle mixture seasonally with these old systems. Your CO% is lean if AFR at idle is 14.5, optimal is ~13.5AFR which is ~3% CO. When you park the car the WUR will heat soak leading to a false reading for start up enrichment. This can be an indication that the bimetalic strip is aging and going out of spec.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 04-06-2010, 05:29 AM
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