A faulted O2 sensor itself could. The O2 sensor is actually used for
emissions control. It only works under closed loop. It attempts to keep
your A/F ratio at 14.7:1. This efficiency allows the catalytic converter to
burn off all excess hydrocarbons, nitrous oxides, etc.
Ron
00 SLT QC 4X2 5.9 46RE 3.92 LSD
For modifications see my DML Profile
-----Original Message-----
From: owner-dakota-truck@buffnet.net
[mailto:owner-dakota-truck@buffnet.net]On Behalf Of Dkota4by4@aol.com
Sent: Monday, November 27, 2000 2:26 PM
To: dakota-truck@buffnet.net
Subject: Re: DML: Help-Running too rich...
Could a fault upstream O2 sensor cause decreased fuel economy?
Russ
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