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Engine knock during acceleration/Rough idle when stopping..... S70

posted by  MilwaukeeVolvo on  Wed Sep 1 16:41 CST 2004
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Hello All

I have a 98 S70 with 131000 miles (non turbo/lpt) Over the last couple of weeks i have been hearing my engine knock during accelration.

This happens EVERY time when the car is cold or has been sitting for a while.

I am adamant about letting my car warm up the last couple of times to see if the knocking sound would go away and with the temprature at normal operating tempratures and the outside weather in the sixty to sevety degree range the car still knock during acceleration.

Also, sometimes whill braking I can feel the car idle rough but that only happens occasionaly.

Is this a precurso to a tune up? I am not due for one for another 8000 miles or so.

Any suggestions would be appreciated.








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    Engine knock during acceleration/Rough idle when stopping..... S70

    posted by  someone claiming to be row on  Fri Sep 10 13:47 CST 2004 [RELATED]

    Techron fuel injector cleaner and 91+ octane gas








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    Engine knock during acceleration/Rough idle when stopping..... S70

    posted by  Suginami on  Sun Sep 5 18:01 CST 2004
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    last visit: Mon Oct 25 10:07 CST 2010
    [RELATED]

    Are you sure it's a knocking not a pinging?

    A knocking sound is usually attributed to a bad connecting rod / rod bearing or main bearing on the crank.

    I would suspect you are hearing a pinging noise. Are you running 91 octance gasoline?
    --
    2000 S70 SE - 55,700 miles








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    Engine knock during acceleration/Rough idle when stopping..... S70

    posted by  Irollturbo on  Fri Sep 3 16:50 CST 2004
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    last visit: Sat Sep 6 14:36 CST 2014
    [RELATED]

    I have not had this problem personally. But if it were me I would try some Fuel Injector cleaner to see if that helps. Techtron or Amsoil PI would be good choices. I'd also check when the fuel filter was last changed.

    -Ted






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