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    #1

    Question about smog pump and cats...

    Ok so here is the deal, and I know I may sound like a retarded redneck, but please just play ball for a while.

    First question... are the cats just bolted up under there? Yeah I know I could look but I am lazy. I assume, and we know what that does, that they are not welded in. The only aftermarket work on my exhaust is after the cats, so it should all be stock on the engine end.

    Second question.... If I take them off, and bang out the internals, will this trip any codes? I assume it will because of O2 sensors?

    Third question... If it does trip codes, and I clear them, will they keep tripping the check engine light? I only want to have to clear them once.

    I will leave the smog pump on till it seizes.. then I will deal with taking it off and getting a delete pully and what not. I only need to pass a visual inspection on the exhaust/emissions... so that is not an issue. I only want to do this really to make the exhaust louder and free up a bit of hp, these things are nasty, and honestly probably about rusted through, so I may have to replace them with straight pipe and those "shells" that look like cats somebody posted on here a while ago. I do not have the money to pay for 4 new cats and installation.

    Thanks for putting up with my retardism..... I much appreciate it.
    "Shakedown"- 1991 Grand Marquis GS Dual exhaust, Magnaflow xl turbos, Rear anti sway bar, Outlaw 1 wheels, 43k miles
    1985 GMC 1500
    Tags: None
    #2
    The 02 sensors are in the stock manifolds, upstream of everything in the exhaust. You could put an elephant on there instead of a muffler and it wouldn't care.


    They are bolted in
    sigpic


    - 1990 Ford LTD Crown Victoria P72 - the street boat - 5.0 liter EFI - Ported HO intake/TB, 90 TC shroud/overflow, Aero airbox/zip tube, Cobra camshaft, 19lb injectors, dual exhaust w/ Magnaflows, Cat/Smog & AC delete, 3G alternator, MOOG chassis parts & KYB cop shocks, 215/70r/15s on 95-97 Merc rims

    - 2007 Ford Escape XLT - soccer mom lifted station wagon - 3.0 Duratec, auto, rear converter delete w/ Magnaflow dual exhaust

    - 2008 Mercury Grand Marquis Ultimate Edition - Daily driver - 4.6 2 valve Mod motor, 4R75E, 2.73s. Bone stock

    Comment

      #3
      Originally posted by 1990LTD View Post
      The 02 sensors are in the stock manifolds, upstream of everything in the exhaust. You could put an elephant on there instead of a muffler and it wouldn't care.


      They are bolted in
      Ok so there are not any after... I know some vehicles have them before and after to monitor the fuel mixture.. that is MAF I believe though... Just worried about any codes that might occur, the smog pump will stay running though.
      "Shakedown"- 1991 Grand Marquis GS Dual exhaust, Magnaflow xl turbos, Rear anti sway bar, Outlaw 1 wheels, 43k miles
      1985 GMC 1500

      Comment

        #4
        no codes, you will just get a hollow echo sound in the exhaust from the hollow cats

        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

          #5
          Originally posted by Lincolnmania View Post
          no codes, you will just get a hollow echo sound in the exhaust from the hollow cats
          Alright.. thanks, will it help if I run straight pipe through them to eliminate this hollow sound? I don't want it to sound like shit, Ill just leave it if it will.
          "Shakedown"- 1991 Grand Marquis GS Dual exhaust, Magnaflow xl turbos, Rear anti sway bar, Outlaw 1 wheels, 43k miles
          1985 GMC 1500

          Comment

            #6
            yea, but you would need to cut the cats off, put pipe thru them, then weld the pipe to the cars and weld the cats back to the pipes

            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

              #7
              right, I figured that... I will just leave it for now then, thanks.
              "Shakedown"- 1991 Grand Marquis GS Dual exhaust, Magnaflow xl turbos, Rear anti sway bar, Outlaw 1 wheels, 43k miles
              1985 GMC 1500

              Comment

                #8
                You don't need a delete pulley to chuck the smog. If you still want your A/C just run a shorter belt.
                2020 F250 - 7.3 4x4 CCSB STX 3.55's - BAKFlip MX4
                2005 Grand Marquis GS - Marauder sway bars, Marauder exhaust, KYB's
                2003 Marauder - Trilogy # 8, JLT, kooks, 2.5" exhaust, 4.10's/31 spline, widened rear's, metco's, addco's, ridetech's 415hp/381tq
                1987 Colony Park - 03+ frame swap, blown Gen II Coyote, 6R80, ridetechs, stainless works, absolute money pit. WIP

                Comment

                  #9
                  ok, I will keep that in mind... no need to chuck it if it works though.
                  "Shakedown"- 1991 Grand Marquis GS Dual exhaust, Magnaflow xl turbos, Rear anti sway bar, Outlaw 1 wheels, 43k miles
                  1985 GMC 1500

                  Comment

                    #10
                    My dad just removed my stock cats yesterday. Mapp gas and a breaker bar were his friend. Leave the gas on the cat bolts near the stock 30 pound exhaust manifolds for a good half minute then slip your socket and extensions on an really work that breaker bar till it comes loose then zip them off with the air gun. The threads on the exhaust manifolds are fairly short so the job is not that difficult.
                    ~David~

                    My 1987 Crown Victoria Coupe: The Brown Blob
                    My 2004 Mercedes Benz E320:The Benz

                    Originally posted by ootdega
                    My life is a long series of "nevermind" and "I guess not."

                    Originally posted by DerekTheGreat
                    But, that's just coming from me, this site's biggest pessimist. Best of luck

                    Originally posted by gadget73
                    my car starts and it has AC. Yours doesn't start and it has no AC. Seems obvious to me.



                    ​

                    Comment

                      #11
                      Originally posted by 91grandmarquis View Post
                      ok, I will keep that in mind... no need to chuck it if it works though.
                      If you don't need it for inspection, I'd chuck it. It's just added crap. You'd be amazed at how much room there is without it.
                      2020 F250 - 7.3 4x4 CCSB STX 3.55's - BAKFlip MX4
                      2005 Grand Marquis GS - Marauder sway bars, Marauder exhaust, KYB's
                      2003 Marauder - Trilogy # 8, JLT, kooks, 2.5" exhaust, 4.10's/31 spline, widened rear's, metco's, addco's, ridetech's 415hp/381tq
                      1987 Colony Park - 03+ frame swap, blown Gen II Coyote, 6R80, ridetechs, stainless works, absolute money pit. WIP

                      Comment

                        #12
                        Smog pumps make obnoxious noises. They must perish. Also, the plumbing makes changing plugs a lot more difficult on that side. I may gut the smog pump on the Mark VII this weekend. Its getting louder.
                        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

                        Everything looks like voodoo if you don't understand how it works

                        Comment

                          #13
                          just putting in a pair of hi-flow cats is nice since you won't get in shit for not having any, and they let all the sound through but smooth out the tinny cracky sound a tad. I did take out my smog pump and A/C with all the brackets and thiers so much more room, and i still passed my e-test...barely but a pass none the less.
                          Finally have an on the books porting/custom fab business!
                          HO bottom end,GT40Ps,cut/welded/ported upper+lower GT40 intakes,Comp XE258 cam,MS3X megasquirt computer,8 LS2 coils,2 dry systems + a 3rd wet,3 core rad w fans..1100hp Lentech WR AOD,custom 4" aluminum/moly Dshaft,custom rear/back half chassis adjustable 4link,wilwood 4 piston,moser 9" axles,locker, M/T 30x12's,4 staged fuel pumps,100lbs sound insulation,power/remote everything,2000W sound.4480lbs. 4.5s 0-60,12.8 1/4

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