[Diy_efi] O2 sensor location

[Jay Rabe]

A wideband sensor should be calibrated to exhaust temp fluctuations. I'm
thinking sits something else.
What comes to mind is a pressurized fuel tank. This can raise fuel pressure
when its warm / pressureized. Easy enough to check, open the gas cap next
time its warm. See if it vents a lot and if the a/f changes.
On Feb 12, 2011 12:14 PM, "Ashley Wagner" <a.wagner2 at cox.net> wrote:
>
> Hello, I have been running a heated O2 sensor at the collector of a
> long tube header. The header is on a 76 chevy PU and the tubes extend
> below the chassis into the airflow. During the day the everything
> works very well, but at night when the temp drops my wideband
> readings become very lean. (the wideband is only for datalogging) I
> am thinking that my O2 sensor is cooling off from the airflow
> surrounding it and giving faulty values to the ecm, it is a heated O2
> sensor. Has anyone had similar issues and other than replacing the
> header does anyone have a suggestion to remedy the problem?
>        7747 ecm and TBI system
>                                                        Thanks for your
time
>
>                                                                Ash
>
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