my O2 sensor offten will get stuck in the rich position, and then i get
about 3 to 5 mpg.
>The O2 sensor sends a voltage to the computer depending on how much
>oxygen it 'measures' in the exhaust gases. The PCM interprets it
>to be either rich or lean. If rich, the PCM adjusts the AFR mixture
>to lean (shortens the injectors' pulse widths). It then gets another
>reading from the O2 sensor and computer then makes another AFR mixture
>adjustment (pulse width). If motor and sensor are operating within
>specs., the PCM should receive voltages representing alternating
>rich/lean conditions.
>
>Do you mind me asking how you know your O2 sensor is not working?
>
>Bob
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