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Misfiring engine 850 1997

posted by  jbogusz1964 on  Mon Jul 28 08:16 CST 2008
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last visit: Sun Aug 3 16:03 CST 2014
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My engine has been kind of misfiring lately. I am not sure how to describe it , but it looks like one of the cylinders just “stops” working for very, very brief moment.It is not a lot but you feel it. It is not consistent. It does not happened all the time and in random frequencies and I can feel it only when on idle ( I am waiting or red light). I do not feel it at all when I am driving. Sparkplugs has been replaced (I put original Volvo) 3 months ago, rotor and cup 2 week ago. Fuel pump 1 year ago. Does anybody experience anything like that. Any known issues. As always thank you very much for any suggestions and help.








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    Misfiring engine 850 1997

    posted by  KlausC on  Mon Jul 28 13:51 CST 2008
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    last visit: Fri Oct 24 10:15 CST 2014
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    When the engine is completely warmed up and it is dark outside, open the hood and see if you see any arcing at the plug wires. Why didn't you change the wires when you replaced the rotor and cap?

    Klaus
    --
    I still miss my 164 and my 854T. Just driving a V70R :)








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      Misfiring engine 850 1997

      posted by  jbogusz1964 on  Mon Jul 28 15:58 CST 2008
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      Thank you Klaus. I have 98K on my Volvo and I heard that wires can last over 100K miles, but I guess I will give a try since I am going to keep a car and they need to be changed anyway. Thanks for your help.








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        Misfiring engine 850 1997

        posted by  KlausC on  Mon Jul 28 17:05 CST 2008
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        last visit: Fri Oct 24 10:15 CST 2014
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        And I just replaced my wires, cap and rotor at 153K. The rotor was just about shot, the cap was good, and the wires were just 10 years old.

        Klaus
        --
        I still miss my 164 and my 854T. Just driving a V70R :)








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          Misfiring engine 850 1997

          posted by  jbogusz1964 on  Thu Jul 31 16:13 CST 2008
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          last visit: Sun Aug 3 16:03 CST 2014
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          I replaced the wires today, but I guess I found what might have been the problem. I re-examined my spark-pugs which I replaced not so long ago. One of them had a big cracks on porcelain part. A piece of porcelain was even chipped. I do not how that happened. I guess I must have done something wrong while replacing them. So I put back one of my "old" not cracked ones. I will see if that will make any difference.







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