Question about 1997 Chevrolet Cavalier

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Oil light comes on upon braking goes out when accelerate oil level is fine on 97 cavalier

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You have a faulty oil sending unit. The oil sending unit senses how much oil pressure is in the car's engine, and when it is faulty, Will trigger the light. When you hit the brakes the oil in the engine will go forward/backward and that causes a fluctuation in the pressure, which causes the faulty oil sending switch to trigger the oil light. Replace the oil sending unit switch and you will be fine.

Posted on Apr 11, 2011

  • 2 more comments 
  • timg6780 Apr 12, 2011

    I took it to my mechanic he ran an oil pressure test the pressure dropped dramatically once the engine got warm and that was sitting at an idle the oil pump is fine the sump is not clogged. his belief is the cam bearings are bad basically making it pointless to dump that kind of money into a car that age

  • Charles Huckeba
    Charles Huckeba Apr 12, 2011

    It does not sound like your mechanic is telling you the truth. Does the car's engine knock when you crank it. If the main bearings are out, the oil pressure will be non-existant at an idle and very low at higher rpm's. If the oil sending unit is faulty, it will not sense the correct oil pressure and will trigger the light to come on. I would recommend that you use a heavier weight oil, and replace the oil sending unit .

  • timg6780 Apr 12, 2011

    he said the oil pressure dropped below 10 psi after idling for 20 minutes

  • churchills Obi
    churchills Obi Jul 15, 2014

    oil light comes on after a long drive

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