Re: Heater Fan Leans Out Mixture???

[Dave Lawson <dlawson@digitalglobe.com>]

Glenn,
>
ANYWAY, if I turn on the heater fan to warm up the
cabin, the reading tends to LEAN, higher fan speeds
yeild more and more LEAN. Why????????????
>
The O2 supplies the sensor signal voltage, you are still 
using the ~+12V to run the LED meter. The meter is telling 
you that it is sensitive to operating voltage. You will need
to find out what voltage the circuit was designed to operate
at and maybe install a voltage regulator for a correct reading.
I once had a similar experience with the oil temp LED 
bargraph on the diff lock panel. Turn on the lights, wipers, 
htr blower and the oil temp rises 5 segments...
-
Dave