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1999 Volvo V70 Question: Rough running and not enough power



Gazzan, 2.4L 5 Cylinder, Glendale, CA, May 18, 2010, 20:38

My V70 drives rough but the idel is ok, the check engine light is not on. It doesn't overheat. When in PARK I press the gas pedal it makes a rough (grrrrrrr)sound. When driving it makes the rough (grrrrrr) sound and doesn't accelarte as quickly as before from stop or while on the move. I have checked the spark plugs and they are ok. The ignition coil boot had a cut and I replaced it and no change. Can you help?

3 Answers
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  • Answer #1

    Visitor, May 19, 2010, 07:02

    Check the easy things first:
    -spark plugs
    -cap and rotor *if DI ignition*
    -blocked or failing Catalytic Converter

    (after driving feel the exhaust before and after the cat, as well as the cat itsself. If the cat-back is a major heat difference than in front deem the converter a fail and replace)

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  • Reply

    Gazzan, May 25, 2010, 13:31

    One of the ignition coils was bad. I have changed it and have changed the spark plugs. The rough grrr is gone, but I have a different problem now. The engine shuts off after driving for 5 minutes. I guess when it heats up then it shuts off. Any ideas?

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  • Answer #2

    May 25, 2010, 16:10

    I would check the codes anyway, some may be stored even if the light is off.
    The fuel pumps can fail on these, I would check the fuel pressure and power to the pump when it is shutting off.

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  • Answer #3

    Visitor, November 26, 2010, 13:31

    youg might have a bad fuel relay or your fuel pump might have abad seal or air filter might need replaced

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