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Oil pressure light coming on when cold

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    #1

    Oil pressure light coming on when cold

    Starting yesterday my oil pressure light has been coming on when I start the car after it's cooled completely down. Once the engine warms up a bit (2 or 3 bars on the digital temp gauge on the dash) it turns off and stays off until the next time I start the car on a COMPLETELY cold engine. My oil level is full and the oil is very clean (only about 600 miles on the oil change). What could be going on? Car drives great whether the light is on or not.

    -It's a 2000 Grand Marquis LS
    Tags: None
    #2
    the oil pump could be going or something came loose.

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)

    Originally posted by gadget73
    ... and it should all work like magic and unicorns and stuff.

    Originally posted by dmccaig
    Overhead, some poor bastards are flying in airplanes.

    Comment

      #3
      makes me wonder about crappy drainback valves in the oil filter.
      86 Lincoln Town Car (Galactica).
      5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

      91 Lincoln Mark VII LSC grandpa spec white and cranberry

      1984 Lincoln Continental TurboDiesel - rolls coal

      Originally posted by phayzer5
      I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

      Comment

        #4
        Try changing oil pressure sensor?
        Nick


        Past: 1967 Continental convertible, 1987 TC Cartier, 1996 TC DAE & Signature, 2002 LS V8, 2006 Zephyr, 2010 MKZ AWD, and many more.....
        Current: 2010 F-150 Platinum Supercrew 4x4
        Wanted: 1967 or 1969 Contnential sedan
        Only in my dreams: A Continental Mark II

        Comment

          #5
          Based on a superficial Google search and a look-see in a Chilton's manual, I would throw the oil pressure switch into the mix. I'm not sure if it's the same thing as a sensor or a sending unit or whether they're different animals. Hopefully someone else can clarify this. From what I've seen, the switch is right beside the oil filter, and it simply closes the circuit when the pressure is high enough to activate it. It could be sticking when cold. As a first step, you can try unplugging it and cleaning the contacts to see if that helps. If not, it seems cheap enough to replace; though if you want to be sure that the switch is really the problem, you can apparently check the oil pressure with a gauge somehow.

          2000 Grand Marquis LS HPP, a hand-me-down in 2008 with 128,000 km; 175,000 km as of July 2014
          mods: air filter box 'tuba', headlight relay harness, J-mod (around 186,350 km), 70mm throttle body, KYB Gas-A-Just shocks, aluminum driveshaft, ARA3 PCM

          Comment

            #6
            to check with a gauge, you remove the idiot light switch (oil pressure sender, oil pressure sensor, all the same part) and screw a test gauge into that port. The test gauges come with a hose so you can locate it somewhere convenient.
            86 Lincoln Town Car (Galactica).
            5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

            91 Lincoln Mark VII LSC grandpa spec white and cranberry

            1984 Lincoln Continental TurboDiesel - rolls coal

            Originally posted by phayzer5
            I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

            Comment

              #7
              Here's the link for an EricTheCarGuy video showing how to use an oil pressure gauge:

              How To Check Oil Pressure -EricTheCarGuy
              http://www.youtube.com/watch?v=I8teB16U0LA
              If you have an oil pressure warning light on, or your oil pressure gauge reads low, it may be time to check the oil pressure with a mechanical gauge. You nee...


              His video on oil pressure basics is also interesting:

              How Oil Pressure Works - EricTheCarGuy
              http://www.youtube.com/watch?v=8f2fcbTh5yw
              How Oil Pressure Works - EricTheCarGuyhttp://www.ericthecarguy.com/Here is the second offering from last weeks set of videos. The most important thing to no...


              I can add all this to my "learn something new everyday" pile. Thanks GMN!
              Last edited by IPreferDIY; 10-06-2014, 12:09 AM.

              2000 Grand Marquis LS HPP, a hand-me-down in 2008 with 128,000 km; 175,000 km as of July 2014
              mods: air filter box 'tuba', headlight relay harness, J-mod (around 186,350 km), 70mm throttle body, KYB Gas-A-Just shocks, aluminum driveshaft, ARA3 PCM

              Comment

                #8
                Awesome, thanks! I will start with the sensor and go from there. I'll let you all know what it is.

                Comment

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