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    Cats question

    Just curious, do Cats go bad with age or mileage? Mine are 21 years old, but only 39000 miles on them.
    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
    I doubt they're bad. But you do need to open her up every now and then to keep em clean.
    Chris - A 20th Century Man \m/ ^.^ \m/

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      #3
      Me too, just curious about how they age.
      My MPG has dropped a bit so, gonna do a full work up soon. Only got 14 city driving.
      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
        time for an off-road H, headers, and duals.
        1983 Grand Marquis 2Dr Sedan "Mercules"
        Tremec TKO conversion, hydraulic clutch, HURST equipped!

        Comment


          #5
          That would only decrease the little torque I have now. Need that for towing...
          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
            14 city is not bad!!!
            Pete ::::>>> resident LED addict and CFI defector LED bulb replacements
            'LTD HPP' 85 Vic (my rusty baby) '06 Honda Reflex 250cc 'Baileys' 91 Vic (faded cream puff) ClifFord 'ODB' 88 P72 (SOLD) '77 LTDII (RIP)
            sigpic
            85HPP's most noteworthy mods: CFI to SEFI conversion w/HO upperstuff headers & flowmasters P71 airbox Towncar seats LED dash light-show center console w/5 gauge package LED 3rd brake light 3G alternator mini starter washer/coolant bottle upgrade Towncar power trunk pull underhood fuse/relay box 16" HPP wheels - police swaybars w/poly rubbers - budget Alpine driven 10 speaker stereo

            Comment


              #7
              Was getting 16 consistently. Same drive everyday. Maybe the warmer weather..
              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


                #8
                I gutted my cats when I did HO conversion at 171,000 miles. I had previously driven it about 160 miles a day for about 2years. The cats were as clean as could be. I dont know but maybe with the low mileage,its obviously been a short trip driver. Its possible it doesnt get to optimum operating temp very often & they could be dirty but I doubt it. I wouldnt mess with em if you aint having the tell-tale signs

                Comment


                  #9
                  I got 10 to 12mpg at best with clogged cats, with sefi, a smooth tranny, and no other problems. I currently get 6-9 mpg at best with bad o2 sensors Your cats are fine, you would have no mid to upper range power and would notice the smell of rotten eggs or a rich condition. This is all city driving, it gets maybe 16mpg at best crusing on the highway (55 to 65mph). Its incredibily frustrating and I wish I could get 14mpg since I use my car as a daily driver.
                  Current rides - 1991 Ford Thunderbird 3.8 v6 (gas saver/DD) - New Heads/Headgaskets with ARP studs, Air Silencer Delete, 70mm MAF, Plasti-dipped Matte Black with a Silver Metalflake Overlay, Muffler Delete, some LED's, 30.233 MPG for high MPG average!
                  2006 Jeep Wrangler 4WD (fun vehicle/backup DD) - 4.0/6spd - too many mods to list.

                  Associated Panthers:
                  Father's 1994 Ford Crown Victoria - Stock, 45,000 miles.
                  Sold in 2007 - 1987 Mercury Grand Marquis LS "Grandpa Special" 2 door.
                  http://www.cardomain.com/ride/2128327

                  Comment


                    #10
                    Originally posted by 85MercPark
                    That would only decrease the little torque I have now. Need that for towing...
                    Put an H-pipe and duals on that wagon! I did that to my 2 door and it's really torquey! Just a regular CV/GM H.
                    '89 Ford LTD Crown Vic - '92 Ford F-150 Custom -
                    '95 Ford Bronco XL -

                    sigpic :rebel:

                    Comment


                      #11
                      I get 22 ish in town with 214k on the cats.
                      1989 Grand Marquis LS
                      flat black, 650 double pumper, random cam, hei, stealth intake, Police front springs, Wagon rear, Police rear bar, wagon front ,exploder wheels, 205/60-15 fronts 275/60-15 rears, 1 5/8" headers, 2.5" offroad x pipe, Eclipse front bucket seats, Custom floor shifter, 4.10 gears, aluminum driveshaft and daily driven. 16.77@83mph

                      Comment


                        #12
                        if the car runs too rich or too lean, the cats can get clogged....i've replaced plenty of low mileage cats.........best way to test cats is with a backpressure tester

                        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


                          #13
                          Very interested in changin Cats

                          Also interested in maybe changing the cats, my vic has 105k (almost all highway), was thinking about going new cats, O2 sensors, H to X cross, and then higher flow but cheap mufflers. Goals: better MPG, maybe a few new horses, and low emissions ( LA is smoggy enough as it is). How do you go about testing cat back pressure?


                          1991 Crown Victoria LTD, Puff the Magik Dragon

                          Comment


                            #14
                            I think you have to drill a hole just above the cat for a connection to a backpressure tester.
                            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

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