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    HO/carb conversion... help

    hey guys. im gonna stick in a 85 HO with a 4 barrel carb, in my 91 GM. i had a couple questions....
    #1 does my engine computer control anything else, like the automatic lights or non cable driven speedometer, or is there a seperate module for that stuff?
    #2 is the fuel pump directly controlled by the ignition, or by the computer?

    Basically, im curious about just being able to unplug the computer being able to run everything except the stock EFI system. Thanks for any info! :help:


    grand_marquis_gt: "Wow dude, you got the GMGT sedan!"


    there, now im cool too

    #2
    as for #1 you'll be fine. lights are independant and the speepo is driven by a separate unit. You might loose your cruise controll though... any one know for sure?

    as for #2, Im not sure, but you will have to modify your fuel system anyway so this can be easily over come
    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

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      #3
      well, cruise control is already gone. that i dont care about at all. but as far as the fuel pump goes.... id like to keep the factory pump and use a return type regulator.... but i think there is a pressure switch on the pump somewhere. if i just run a switch and a relay to turn it on, with a return regulator, will that be a problem?


      grand_marquis_gt: "Wow dude, you got the GMGT sedan!"


      there, now im cool too

      Comment


        #4
        I believe the fuel pump is computer controlled. When you turn the key on, the computer kicks the fuel pump on for a few seconds to prime the system, then shuts off. Then when you start the car, the pump stays on.

        Like I said, I am not sure, but I think that's how it works. Someone will know for sure though.
        Pebbles-1968 Ford F250
        Pile of Junk! An Electronics Project Site (To get wet by)<---Clicky! NEW STUFF!!!!

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          #5
          Might be easier to retain the EFI system and just use the injectors and PCM from an HO powered car. The 87+ engines also have better heads.
          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


            #6
            why do you want to convert to an 85 with a carb?
            you would definitely lose cruise control and probably the speedometer unless you leave the computer plugged in. it would be much easier to convert to an ho with efi. just my 2 cants lol
            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


              #7
              Four Barrel...

              Scott,
              He wants that cool four barrel sound that you don't get with EFI!!!!


              Agent Caitlin Todd… You know Tony, Statistics show that married men live longer…
              Agent Tony DiNozzo… It only seems longer….

              http://www.tomspolicecars.com/

              Comment


                #8
                Need a spread bore 4 bbl for really cool sound. Old Chryslers with Carter ThermoQuads were the best for that. Back bores on those things were ginormous.
                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


                  #9
                  Four Barrels!

                  I had a 78 Fury with the thermo quad.. with the aircleaner lid turned over, it would shake the dash!!! I got in a chase one time, and the dispatcher told me to get out of the four barrels so she could hear me....


                  Agent Caitlin Todd… You know Tony, Statistics show that married men live longer…
                  Agent Tony DiNozzo… It only seems longer….

                  http://www.tomspolicecars.com/

                  Comment


                    #10
                    Classic story, tom...
                    1983 Grand Marquis 2Dr Sedan "Mercules"
                    Tremec TKO conversion, hydraulic clutch, HURST equipped!

                    Comment


                      #11
                      I would really like a late 50's early 60's Plymouth Fury. Good story man.
                      Pebbles-1968 Ford F250
                      Pile of Junk! An Electronics Project Site (To get wet by)<---Clicky! NEW STUFF!!!!

                      Comment


                        #12
                        son of a bitch! :chainsaw:
                        :rocket: :cuss: :animalmother: :pissed:


                        grand_marquis_gt: "Wow dude, you got the GMGT sedan!"


                        there, now im cool too

                        Comment


                          #13
                          Originally posted by Jason91GM
                          id like to keep the factory pump and use a return type regulator.... but i think there is a pressure switch on the pump somewhere. if i just run a switch and a relay to turn it on, with a return regulator, will that be a problem?
                          Why? Hang a pump on the engine and do it right.

                          Comment


                            #14
                            Originally posted by Mercracer
                            Hang a pump on the engine and do it right.
                            well, that would be dandy, but 2 probs. #1 im gonna put the original 91 back in after some serious rebuilding and beefin up.... and i dont think the roller cams have a spot for a fuel pump. #2 i have bad luck with mechanical pumps and am always replacing them.


                            grand_marquis_gt: "Wow dude, you got the GMGT sedan!"


                            there, now im cool too

                            Comment


                              #15
                              Actually, I dont think Ford fuel pumps run off the cam. I think they have an eccentric on the crankshaft or something.
                              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

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