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V70 EVAP system fault V70-XC70 1999

posted by  cavaliers16 on  Sat Mar 29 10:41 CST 2008
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last visit: Fri Nov 15 07:32 CST 2013
[RELATED]

The V70 has another EVAP system fault. I'm getting both codes P0455 and P0442- large and small evaporator system leaks. I have been searching through the archives on this problem, and it seems pretty common (due to the fact that it seems nearly discussed to death...). The "Check Engine" light has been on for about 20,000 miles now despite my replacing the gas cap seal and gas cap three times, replacing some of the vacuum hoses in the engine bay, and having the mechanic check it out. I read that it could be the evap valve filter, a fuel filter (?), or the vacuum can itself near the fuel tank. Should I just pull the valve and clean it out first, or is there something else that I should check first?

Edit: I just pulled the purge valve and it looks clean (no build up). Is a clogged valve a visible problem?
--
'83 Mercedes-Benz 300D, '89 Volvo 740 Turbo Wagon, '99 Volvo V70 GLT








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    V70 EVAP system fault V70-XC70 1999

    posted by  KlausC on  Sat Mar 29 11:04 CST 2008
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    last visit: Fri Oct 24 10:15 CST 2014
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    There are 3 check valves on my V70. White so they are easy to see. They are directional, and when they break they let pressure go the wrong way and the light goes on.
    You can blow into them to see if they still hold vacuum.

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








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      V70 EVAP system fault V70-XC70 1999

      posted by  cavaliers16 on  Sat Mar 29 11:07 CST 2008
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      last visit: Fri Nov 15 07:32 CST 2013
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      I just checked the one on the fan shroud. Where are the other two?
      --
      '83 Mercedes-Benz 300D, '89 Volvo 740 Turbo Wagon, '99 Volvo V70 GLT








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        V70 EVAP system fault V70-XC70 1999

        posted by  KlausC on  Sat Mar 29 13:10 CST 2008
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        last visit: Fri Oct 24 10:15 CST 2014
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        On the line that goes between the throttle body and the air cleaner.

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








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          V70 EVAP system fault V70-XC70 1999

          posted by  Rule 308 on  Sun Mar 30 05:32 CST 2008
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          last visit: Tue May 8 09:20 CST 2012
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          It depends upon which emissions system you have in your car but if it is the popular one you probably have a faulty purge valve, which is the one by the fan shroud. I have had a couple of cars recently that I had to parts warranty near new valves in because they failed too. Volvo has been having problems with these stupid valves for awhile. You can suck and blow on them and they will seemingly work but under actual operation they will fail. The only way I have to diagnose them is to listen to them work and if they do not have the correct sound to them I replace them. Needless to say that is an acquired thing.

          Mark








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            V70 EVAP system fault V70-XC70 1999

            posted by  cavaliers16 on  Sun Mar 30 11:01 CST 2008
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            last visit: Fri Nov 15 07:32 CST 2013
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            I'll just get a new one. Autohaus has them for pretty cheap.

            Thanks.
            --
            '83 Mercedes-Benz 300D, '89 Volvo 745 Turbo, '99 Volvo V70 GLT







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