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01-02-2009, 05:56 PM
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Drives: '08 Bayou Blue LB AT Join Date: Oct 2008
Location: West Hills, CA
Posts: 2,517
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Q about placement of wideband A/F sensor
I just wanted to get this straight in my head. The further back one places the wideband A/F sensor, in the exhaust system, the leaner it will show? i.e. most accurate is in the header, more lean after first cat, more lean after second cat.
The reason I ask is that when I dyno'd the car, the mechanic read the A/F mixture from the tailpipe. The entire A/F curve is probably shifted slightly to the lean side, right? TIA
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