440 oil light

Discussion in 'Volvo 440' started by PP, Jan 20, 2005.

  1. PP

    PP Guest

    Anyone know why my oil light comes on at low revs. There is plenty of oil in
    the engine.
    PP, Jan 20, 2005
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  2. Often older cars with some internal engine wear suffer this problem when the
    engine is warm at very low RPM's.

    The oil pump has worn a tad, and just does not pump like it use to. The
    main bearings have worn a tad too and are more likely to let oil seep by
    faster they the design spec, so the oil does not build up as much pressure
    when the engine is not turning the oil pump fast enough.

    It's conceivable that the fault is in the sending unit as well....

    Solution 1: Fughetaboutit!
    Solution 2: Replace the oil pump, and hey while the pans off do the mains
    Solution 3: Get an oil pressure gauge and thread it into the hole where the
    oil pressure sending unit lives and see what kinds of pressures you have at
    different rpms and operating temps.
    Solution 4: Solution 1 with the addition of checking the oil level every few
    days **just to be sure** with an ear out for unusual mechanical noises.
    Steve n Holly, Jan 20, 2005
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  3. In addition to the effects of wear, it is possible there is a serious
    failure taking place, or that the sensor is getting weak and annoying you
    with false alarms. I strongly recommend you get the oil pressure checked -
    it isn't expensive - and if it is acceptable (a mechanic with a radio show
    said 6 psi is the minimum pressure for idle, but I really don't know) a new
    sender may do the trick.

    Michael Pardee, Jan 20, 2005
  4. Bearings on way out, oil is wrong grade, idle too low, oil pressure relief
    valve needs cleaning/adjustment/replacement, filter getting blocked.

    Cheers, Peter.
    Peter K L Milnes, Jan 21, 2005
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