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S70 fuel problem S70

posted by  volvosfive on  Thu Aug 4 07:35 CST 2005
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last visit: Sun Aug 21 08:01 CST 2011
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Hi All,

I have a '98 S70 with 130 K miles. Recently, it has been using more fuel, and having black smoke come from the tailpipe. I'm thinking that the problem is the fuel pressure regulator. Does this sound right? Also, where is the FPR on this model and how hard is it to change?

Thanks,
Dave








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    S70 fuel problem S70

    posted by  jrothe on  Fri Aug 5 05:39 CST 2005
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    last visit: Thu Nov 13 05:10 CST 2008
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    No check engine light? No codes via OBDII?

    I wouldn't go one step further with trying to diagnose this problem until I hooked up a code reader to the car. I'm expecting that you're going to find problems with the Mass Air Flow (MAF) sensor or -- less likely -- with the O2 sensor.

    --
    Jim Rothe, '99 S70 T5M,
    http://www.jimrothe.com/volvo/index.html








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    S70 fuel problem S70

    posted by  Boobaka on  Thu Aug 4 08:41 CST 2005
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    When was your last tune up? (Cap, Rotor, Plugs, Wires). All I did was replace my plugs with OEM Plugs from the dealer and im getting another 2-3 miles per gallon. Sorry but im not sure where the FPR is located.








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      S70 fuel problem S70

      posted by  volvosfive on  Thu Aug 4 10:25 CST 2005
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      last visit: Sun Aug 21 08:01 CST 2011
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      The plugs are fairly new ( last 5K). All of the other ignition parts are original. It just seems like the car is getting way too much fuel, so that would explain the black smoke from the exhaust.

      Thanks for your help.
      Dave








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        S70 fuel problem S70

        posted by  Boobaka on  Thu Aug 4 10:50 CST 2005
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        With your cap/rotor/wires being as old as they are and with your mileage, replacing them could do nothing but help. What kind of plugs did you use? Id recommend dealer plugs or just a good basic plug like Bosch Copper. You also may want to think about replacing your fuel filter if youve never done so. It may not affect your mileage problem, but its the best way to prevent having to replace your fuel pump. With a clogged filter the pump has to work extra hard. Also, a can of SEAFOAM or BG-44K(even better) in the tank at your next fill up should help.








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    S70 fuel problem S70

    posted by  someone claiming to be lewismug on  Thu Aug 4 07:42 CST 2005 [RELATED]

    I would first try to get some sea foam and run it through the engine, and gas tank. It helps to clean the carbon from the engine. Do a search on here for it and you'll see a lot of posts about it, or on www.turbobricks.com . I know it will help your mpg/ and clear up any hesitation it may have. It's a lot cheaper than swapping parts, especially if you're not sure of the problematic component, and it does your engine good. Their website is here: www.seafoamsales.com They have a listing of all the stores that sell their product.







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