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    Mystery oil loss

    My brothers 90s crown vic uses alot of oil. Not leaking and not really burning it. Tried PVC and hoses. About a quart in two weeks. Any ideas?
    2000 Grand Marquis LS
    2000 F150 XLT 6 inches of lift.
    1987 Bill Blass Mark VII - Sold
    1985 Mercury Grand Marquis Colony Park- SOLD. to a little old lady
    Mercury Owners Group member
    Save The Whales, Restore an Old Station Wagon!!

    #2
    No leaks???? Pop the breather cap off the valve cover and see if a lot of smoky oil comes out from blowby like a mofo.
    Chris - A 20th Century Man \m/ ^.^ \m/

    Comment


      #3
      Nothing that could account for the volume lost.

      Pop the breather cap off the valve cover and see if a lot of smoky oil comes out from blowby like a mofo
      What does it mean if this is the case? Bad rings?
      2000 Grand Marquis LS
      2000 F150 XLT 6 inches of lift.
      1987 Bill Blass Mark VII - Sold
      1985 Mercury Grand Marquis Colony Park- SOLD. to a little old lady
      Mercury Owners Group member
      Save The Whales, Restore an Old Station Wagon!!

      Comment


        #4
        Yup, you can drive it like that but it fouls the plugs easy and will plug the cats after a while.
        Chris - A 20th Century Man \m/ ^.^ \m/

        Comment


          #5
          He hasn't said anything about the plugs fouling, will have to ask him
          2000 Grand Marquis LS
          2000 F150 XLT 6 inches of lift.
          1987 Bill Blass Mark VII - Sold
          1985 Mercury Grand Marquis Colony Park- SOLD. to a little old lady
          Mercury Owners Group member
          Save The Whales, Restore an Old Station Wagon!!

          Comment


            #6
            rear seal? running onto torque converter, but somewhat held up by the converter hole plug, so it just slowly drips out? BTW a 90-91 CV is for the 5.0/5.8 boys. This thread may be better served there depending what year he has.

            Comment


              #7
              if it'snot leaking out onto the ground,replace the pcv screen.........might be clogged.........or the engine was overheated at one time and the oil control rings on the pistons are toast.........my towncar burned a qt every 400 miles like clockwork
              scott

              1986 lincoln towncar signature series. 5.0 HO with thumper performance ported e7 heads, 1.7 roller rockers, warm air intake, 65mm throttle body, 1/2" intake spacer, ported intakes, 3.73 rear with trac lock, 98-02 front brake conversion, 92-97 rear disc conversion, 1" rear swaybar, 1 3/16" front swaybar, 16" wheels and tires, loud ass stereo system, badass cb, best time to date 15.94 at 87 mph. lots of mods in the works 221.8 rwhp 278 rwt
              2006 Lincoln Town Car Signature. Stock for now
              1989 Ford F-250 4x4 much much more to come, sefi converted so far.
              1986 Toyota pickup with LSC wheels and 225/60/16 tires.
              2008 Hyundai Elantra future Revcon toad
              1987 TriBurner and 1986 Alaska stokers keeping me warm. (and some pesky oil heat)

              please be patient, rebuilding an empire!

              Comment


                #8
                If it's a 4.6 car, then the problem is valve seals. '91-'95 4.6 heads had a poor design that will cause oil usage over time. The amount of usage varies, but it will be seen in the form of blue smoke out of the tailpipe when the car takes off from a stop, or idles for long periods.

                Ray
                Car: 2004 Mercury Marauder
                Engine/Tranny: 49k miles and bone stock....for now

                Comment


                  #9
                  Originally posted by Johnnyiroc
                  rear seal? running onto torque converter, but somewhat held up by the converter hole plug, so it just slowly drips out? BTW a 90-91 CV is for the 5.0/5.8 boys. This thread may be better served there depending what year he has.
                  It is a 4.6, It's a 90s CV, not sure of the exact year.
                  2000 Grand Marquis LS
                  2000 F150 XLT 6 inches of lift.
                  1987 Bill Blass Mark VII - Sold
                  1985 Mercury Grand Marquis Colony Park- SOLD. to a little old lady
                  Mercury Owners Group member
                  Save The Whales, Restore an Old Station Wagon!!

                  Comment


                    #10
                    Originally posted by lincolnmania
                    replace the pcv screen
                    Did that

                    Originally posted by lincolnmania
                    oil control rings on the pistons are toast.........
                    my towncar burned a qt every 400 miles like clockwork
                    scott
                    exactly, that could be it.
                    2000 Grand Marquis LS
                    2000 F150 XLT 6 inches of lift.
                    1987 Bill Blass Mark VII - Sold
                    1985 Mercury Grand Marquis Colony Park- SOLD. to a little old lady
                    Mercury Owners Group member
                    Save The Whales, Restore an Old Station Wagon!!

                    Comment


                      #11
                      Originally posted by 93 Marquis
                      If it's a 4.6 car, then the problem is valve seals. '91-'95 4.6 heads had a poor design that will cause oil usage over time. The amount of usage varies, but it will be seen in the form of blue smoke out of the tailpipe when the car takes off from a stop, or idles for long periods.

                      Ray
                      Or this, have to let him know to check that, those simple on the 4.6's?
                      2000 Grand Marquis LS
                      2000 F150 XLT 6 inches of lift.
                      1987 Bill Blass Mark VII - Sold
                      1985 Mercury Grand Marquis Colony Park- SOLD. to a little old lady
                      Mercury Owners Group member
                      Save The Whales, Restore an Old Station Wagon!!

                      Comment


                        #12
                        I second the valve seals. 92-95 model years have this problem. Those early (or pre-NPI) 4.6's are notorious for it. Not unlike Chevy's 305 from what I hear.

                        The valve seals are not a problem on 96+ 4.6's though, Ford used better valve seal material after that.
                        2000 Mercury Grand Marquis LS HPP.

                        http://www.cardomain.com/ride/2336322

                        Friends don't let friends drive donk.

                        Comment


                          #13
                          Thanks I will forward him your advise
                          :worship:
                          2000 Grand Marquis LS
                          2000 F150 XLT 6 inches of lift.
                          1987 Bill Blass Mark VII - Sold
                          1985 Mercury Grand Marquis Colony Park- SOLD. to a little old lady
                          Mercury Owners Group member
                          Save The Whales, Restore an Old Station Wagon!!

                          Comment


                            #14
                            On the difficulty scale I'd rate doing your own valve seals at a 8+. Getting the passenger side valve cover off alone is a battle.

                            Having it done at a shop will cost $600 & up, provided they want to touch it. As BigTomZ said, Ford addressed the problem in the '96-up heads. At the labor cost of the job you could pick up a newer low mileage 4.6 and replace it.
                            Car: 2004 Mercury Marauder
                            Engine/Tranny: 49k miles and bone stock....for now

                            Comment


                              #15
                              knowing my brother, he will drive it as is forever!

                              Thanks All
                              2000 Grand Marquis LS
                              2000 F150 XLT 6 inches of lift.
                              1987 Bill Blass Mark VII - Sold
                              1985 Mercury Grand Marquis Colony Park- SOLD. to a little old lady
                              Mercury Owners Group member
                              Save The Whales, Restore an Old Station Wagon!!

                              Comment

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