Question about air/fuel meter installed on my 740.....

Discussion in 'Volvo 740' started by geronimo, Aug 2, 2008.

  1. geronimo

    geronimo Guest

    I installed a nifty air/fuel ratio meter on my 92 Volvo 740. Before
    it goes colsed loop, it read 17.0 and pretty stable. It is obvious
    when the car goes closed loop, as it then varies a lot. It takes a
    measurement of the O2 sensor about once a second. I noted, at idle,
    that the high is 19.5 and the low is 14.3. But it might be a false
    assumption to take the median value as the average mixture reading...I
    don't know. I see that Chevron says that stoiciometric for regular
    unleaded gas is least for their brand. But I would think
    that all gas would be somewhere close to this. SInce the low reading
    is so close to 14.7, and the high is so much higher, I am thinking
    that it is showing a lean condition. THe instructions that came with
    the gauge don't tell you how to interpret the readings! But the gauge
    is clearly marked AIR/FUEL. So I think it is saying the air/fuel
    ratio is X parts AIR relative to 1 part fuel. But the way my Volvo
    wagon eats gas, I SERIOUSLY doubt it is actually running lean!
    geronimo, Aug 2, 2008
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