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Misfire on Cyl 5 (P0305) V70-XC70 2005

posted by  mbliss on  Sun Jul 14 18:15 CST 2019
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last visit: Tue Oct 21 20:49 CST 2014
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I assume I need to replace the #5 coil, but after a couple of years driving this XC70, it seems strange it has only happened twice, both while towing our pop-up camper. The first time was after a couple of hours on the freeway in near 100 heat, the second time after several hours in mild weather and after a stop mid-way. In both cases after a stop, the problem went away. Is there something about the added stress of towing a trailer that would cause an issue with the coil?

--
-- '96 850T at about 240K, 2005 XC70 at 100K, 1999 V70 at 200K; gone but not forgotten '97 850T5, '83 244 DL, '81 245 and '64 Amazon








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    Misfire on Cyl 5 (P0305) V70-XC70 2005

    posted by  KlausC on  Mon Jul 15 09:21 CST 2019
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    last visit: Fri Oct 24 10:15 CST 2014
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    What kind of spark plugs are you using? Towing a trailer, along with filling the rear of the car with gear, adds a lot of weight. The additional stress causes you to use more gasoline, especially going up hill at low rpms. That can cause an over-rich condition if the plug gaps are not at .028 or a smaller spark from iridium type plugs.

    On long up hills, it is best to downshift to 4th (500 rpms faster). This also helps the tranny keep cool by increasing its pump speed.
    --
    Keeping it running is better than buying new








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      Misfire on Cyl 5 (P0305) V70-XC70 2005

      posted by  mbliss on  Tue Jul 16 10:23 CST 2019
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      last visit: Tue Oct 21 20:49 CST 2014
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      The first time this happened, nearly a year ago, I changed the plugs to Volvo plugs, not sure what kind those were, nothing special like the platinum plugs, and checked the gaps, of course. Both times happened on the freeway, cruising at near the speed limit (60-65). I'll try rotating the coil to a different cylinder, but it will probably be awhile before I see any result ;-)
      --
      -- '96 850T at about 240K, 2005 XC70 at 100K, 1999 V70 at 200K; gone but not forgotten '97 850T5, '83 244 DL, '81 245 and '64 Amazon








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    Misfire on Cyl 5 (P0305) V70-XC70 2005

    posted by  hf63 on  Mon Jul 15 05:42 CST 2019
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    last visit: Wed Oct 22 15:19 CST 2014
    [RELATED]

    Check the plugs and rotate the coils to a different position. The pig tails to the coils also go bad so double check them.







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