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does ODB monitor intake vacuum? S90-V90 1998

posted by  GAcyclops on  Mon May 26 16:16 CST 2014
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last visit: Sun Jun 29 13:55 CST 2014
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While waiting to hear from the "ecometer" folks, I thought I'd see if you guys know whether the computer/obd system in a 98 S90 monitors intake vacuum?

The ecometer plugs into the obd port and is supposed to give real-time fuel economy readouts.

Thanks








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    does ODB monitor intake vacuum? S90-V90 1998

    posted by  hf63 on  Sat Jun 7 04:29 CST 2014
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    last visit: Wed Oct 22 15:19 CST 2014
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    I very much doubt that the OB system will monitor vacuum!!!








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      does ODB monitor intake vacuum? S90-V90 1998

      posted by  GAcyclops on  Sat Jun 7 16:29 CST 2014
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      last visit: Sun Jun 29 13:55 CST 2014
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      Well, I bought a Kiwi meter, which plugs into the OBD port and gives real-time fuel economy readings and more. Very nice unit.
      So the vacuum issue is moot.








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        does ODB monitor intake vacuum? S90-V90 1998

        posted by  Peetz on  Sat Jun 7 19:11 CST 2014
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        last visit: Thu Oct 9 10:18 CST 2014
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        Most factory instantaneous fuel mileage readouts use a simple calculation based on injector dwell time and the road speed signal. Dead accurate. That's averaged for mpg over the tankful.







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          does ODB monitor intake vacuum? S90-V90 1998

          posted by  dewfpo on  Sat Aug 23 16:07 CST 2014
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          last visit: Thu Oct 23 18:34 CST 2014
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          I've had two vehicles that provides mpg data on the dash and both were inaccurate. They were "optimistic" when compared to gallons used per mile driven.

          One was a 2003 Audi Allroad and the other is a 2005 Chevy Silverado.

          Yes, they had OE tires on them and I keep a log of fuel used and miles driven so I have plenty of data.

          DEWFPO
          --
          1998 S90 088,900 and 1995 964 154,100








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            does ODB monitor intake vacuum? S90-V90 1998

            posted by  Volvodad on  Mon Sep 1 18:49 CST 2014
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            last visit: Thu Oct 23 16:18 CST 2014
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            Agreed.

            I've tracked the car readout compared to actual fuel economy on a 1996 Dodge Caravan, a 2005 Nissan Altima, and my 2010 XC60. On the highway they are closer to the true reading but still high. In mixed urban driving they are solidly optimistic. Of course, the XC60 is the most accurate.... :-)
            --
            Bob: Son's XC70, my 83 240, 89 745 (V8) and XC60. Also '77 MGB and some old motorcycles







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