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Drop in gas mileage and power. Wondering why. V70-XC70 1998

posted by  kcookvt on  Sat Aug 19 13:55 CST 2017
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last visit: Tue Aug 5 19:59 CST 2014
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Recently, the power seems to have waned on my '98 V70 AWD (light-pressure turbo). Also, I took a trip yesterday on which I normally get about 24 mpg, but this time the car got about 21. Passing power/acceleration seems a little sluggish. The car has 201,500 miles on it. It was rainy and humid on yesterday's trip. I am wondering whether, with a car this old, I should just expect a decrease in power and mileage or if there is something I should do to restore her to her former glorious, energetic self.

Thanks








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    Drop in gas mileage and power. Wondering why. V70-XC70 1998

    posted by  KlausC on  Sat Aug 19 14:05 CST 2017
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    It's running rich. Possible causes: vacuum leak, worn out plugs, front O2 sensor wearing out, you're gaining weight...
    --
    Keeping it running is better than buying new








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      Drop in gas mileage and power. Wondering why. V70-XC70 1998

      posted by  kcookvt on  Sat Aug 19 14:45 CST 2017
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      I notice that I have not changed the plugs (or distributor) in about 3 1/2 years and 35,000 miles. Might be the culprit. Are there other items for a tune-up? Is the distributor a DIY job? (I imagine the plugs cannot be too difficult).

      Thanks!








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        Drop in gas mileage and power. Wondering why. V70-XC70 1998

        posted by  jwalker on  Sun Aug 20 06:33 CST 2017
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        last visit: Fri Jun 6 08:39 CST 2014
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        Plugs should last longer than 35k.

        If it were my car, I'd first look for a vacuum leak as Klaus suggested. Start with the air intake hose. They wear out - look for cracks, splits, holes etc. If it has never been replaced it is probably overdue... If that is good, then I'd move onto checking all the other engine related vacuum hoses before changing plugs, cap etc.

        Does the engine use any oil?







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          Drop in gas mileage and power. Wondering why. V70-XC70 1998

          posted by  kcookvt on  Sun Aug 20 09:22 CST 2017
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          It uses a little oil, but not a lot. I think the 35K mile plugs are where I'll start. Seems a likely culprit. Then vacuum leaks. Thanks!








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            Drop in gas mileage and power. Wondering why. V70-XC70 1998

            posted by  jwalker on  Mon Aug 21 07:56 CST 2017
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            last visit: Fri Jun 6 08:39 CST 2014
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            Another thought: When was the last time you changed the air filter? A badly clogged air filter might cause your symptoms. You could also check the air snorkel (intake) hose when checking the air filter. I once had a budding mouse colony in my 240's air filter box...:)






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