Oil light comes on 94 850

Discussion in 'Volvo 850' started by caaron, Sep 21, 2004.

  1. caaron

    caaron Guest

    I recently purchased a 1994 non-turbo 850. It has plenty of oil in it, but
    the oil light comes on frequently--it kind of flickers on and off while I'm
    driving, and at other times it behaves and just stays off. Any idea as to
    what could be causing this or how to fix it?


    caaron, Sep 21, 2004
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  2. caaron

    Boris Mohar Guest

    Could be the sensor itself or the wire leading from it intermittently
    shorting to ground.


    Boris Mohar

    Got Knock? - see:
    Viatrack Printed Circuit Designs http://www3.sympatico.ca/borism/
    Boris Mohar, Sep 21, 2004
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  3. Well, sorry to say this, but...you could have worn main bearings, a big but
    not too big job, or any number of other internal engine parts worn enough to
    open up the clearances and cause a drop in oil pressure. Oil pumps wear out
    too, however the first step is to take the oil pressure sending unit out and
    put a gauge in it's place and see if the engine has enough pressure.

    By the way the sending units fail too and if that's the case the whole job
    should be less then 100 bucks.

    are you using the correct weight oil btw?
    Steve n Holly, Sep 21, 2004
  4. caaron

    caaron Guest

    The car performs well but I will do an oil pressure check on it. The
    previous owner mentioned that the problem with the light started when he had
    the engine seals replaced, and that he thought they may have shorted the
    wire when they did the seals. I am using the proper oil viscosity, so that
    isn't the problem. Thanks for the suggestions.

    caaron, Sep 26, 2004
  5. caaron

    AB Guest

    There is also a problem with the 'O' ring where the oil pickup is which if
    it is leaking will cause the pump to suck air (and that will cause low
    pressure). Might be worth checking there too?
    AB, Sep 28, 2004
  6. caaron

    caaron Guest

    Thanks, that is a good suggestion. I did have an oil pressure check done,
    and the oil pressure is fine.

    caaron, Oct 1, 2004
  7. If the OP is good then the sending unit is my guess as the problem point.
    Steve n Holly, Oct 1, 2004
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