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Random misfire codes after hot car sits 30-45 minutes S70 1998

posted by  dick on  Sun Mar 25 19:32 CST 2012
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last visit: Sun Aug 3 15:24 CST 2014
[RELATED]

Car has been perfect until recently. When cold, starts and runs flawlessly. After sitting it misses and barely idles but smooths out. Wondering if the temp sensor by the thermostat does this or?

Suggestions appreciated. Seems when one car is on the fritz there is another following.

dick








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    Random misfire codes after hot car sits 30-45 minutes S70 1998

    posted by  bunsen on  Tue Mar 27 21:17 CST 2012
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    last visit: Thu Jun 27 09:21 CST 2013
    [RELATED]

    my 2000 v70xc has a similar problem, checked my ect it seems to be fine, going to replace some questionable vacuum line in the engine compartment and see if that helps at all, does your car idle smooth out, or does it smooth out upon acceleration?








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      Random misfire codes after hot car sits 30-45 minutes S70 1998

      posted by  dick on  Wed Mar 28 12:59 CST 2012
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      last visit: Sun Aug 3 15:24 CST 2014
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      Checked resistance and it is a little high. Ordered a new one, but right now it is smooth at idle and no more codes thrown. Did clean connections and noticed the plug is aging so crimped the female portion a bit for a better contact. At this point, the car runs perfectly. Will report any further problems.

      dick








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    Random misfire codes after hot car sits 30-45 minutes S70 1998

    posted by  KlausC on  Mon Mar 26 09:45 CST 2012
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    last visit: Fri Oct 24 10:15 CST 2014
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    It very well could be the ECT sensor. First, unplug the sensor and clean the contacts. Watch the almost useless temp gauge on the dash and see if it points to the middle before restart.

    With the coolant still hot, the resistance at the ECT sensor should be 150 Ohms or less. If you get a reading of 300 or more, replace the ECT sensor.

    Klaus
    --
    Volvos should be saved from the junk yards, not donated.








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      Random misfire codes after hot car sits 30-45 minutes S70 1998

      posted by  dick on  Mon Mar 26 10:31 CST 2012
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      last visit: Sun Aug 3 15:24 CST 2014
      [RELATED]

      Will break out the meter later. In the middle of installing a new AC compressor on wife's '98. Happy I have done one before. The '98 with codes is son's car which I am borrowing.

      dick







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