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Bad MPG 850

posted by  volvosfive on  Sun Feb 10 10:54 CST 2008
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last visit: Sun Aug 21 08:01 CST 2011
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After driving my dad's '97 850 for the past couple of weeks I've noticed that the MPG isn't that good. I've been getting 15 MPG around town and that's not even driving it hard. The car is a low pressure turbo automatic. The check engine light is not on and all of the tune up stuff is good (plugs, wires, cap, rotor, air filter). From what I've read in the archives 15 seems very low. Most of the time I even drive with the transmission in economy mode.

Thanks in advance!

Dave








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    Bad MPG 850

    posted by  someone claiming to be Fred on  Sat Feb 16 05:49 CST 2008 [RELATED]

    I get 14 MPG on my 94 850 TurboWagon. Not good either. I was told she's leaking oil into the turbo and requires a $2500 job. Needless to say, I am living with it and topping the oil avery month or so. Other than that she's running great at 115K

    Fred








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    Bad MPG 850

    posted by  KlausC on  Sun Feb 10 14:21 CST 2008
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    last visit: Fri Oct 24 10:15 CST 2014
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    Check the vacuum lines, especially the elbows for leakage. Make sure there are no leaks in the intercooler piping all the way to the throttle body. Clean the dirty throttle body, it's dirty.
    Have a mechanic check the O2 sensors, the front one may be getting weak.

    Klaus
    --
    The 164 has a new home, all I am left with are a 95 854T and a 98 V70R :)








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      Bad MPG 850

      posted by  volvosfive on  Sun Feb 10 16:35 CST 2008
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      last visit: Sun Aug 21 08:01 CST 2011
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      Is it basically the same procedure on cleaning the throttle body as on the RWD cars? I'm guessing I need to get a new gasket first. I'll probably go ahead and buy new vacuum elbows as well. Mileage is 160 K and the O2 sensors are original.

      Thanks,

      Dave








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        Bad MPG 850

        posted by  KlausC on  Sun Feb 10 17:11 CST 2008
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        last visit: Fri Oct 24 10:15 CST 2014
        [RELATED]

        Don't use carb cleaner, it is too harsh, get TB cleaner. The old gasket will not come off in one piece :) and you will have to scrape it off. A new one is cheap, even at the dealer.
        Make sure the vacuum tree is clean, too. Be careful, the nipples on the tree are fragile.

        If you are using regular gas, stop and fill it with 89 octane. That is minumum for a turbo, LPT or HP.

        Klaus
        --
        The 164 has a new home, all I am left with are a 95 854T and a 98 V70R :)







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