[Diy_efi] O2 sensor location

[Alan To]

When a wideband sensor is under temperature it exhibits the same 
symptoms as your describe; readings will be skewed towards stoich. Which 
lambda controller are you running? A quick fix is to move the location 
of the sensor closer to the exhaust ports as the exhaust heat will warm 
the sensor up, might be a band aid fix though as in the summertime your 
sensor may overheat.

Regards,

Alan To

On 2/12/2011 9:14 AM, Ashley Wagner 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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